Journal of Materials Processing Technology最新文献

{"title":"Refill friction stir spot welding of high-strength aluminium alloys: Linking hook formation and calculated heat input to microstructure and mechanical properties","authors":"Sebastian Fritsche ,&nbsp;Jonathan Draper ,&nbsp;Ricardo Henrique Buzolin ,&nbsp;Ryan Maxwell ,&nbsp;Athanasios Toumpis ,&nbsp;Alexander Galloway ,&nbsp;Sergio T. Amancio-Filho","doi":"10.1016/j.jmatprotec.2025.119180","DOIUrl":"10.1016/j.jmatprotec.2025.119180","url":null,"abstract":"<div><div>Refill Friction Stir Spot Welding is a promising technique for joining lightweight aluminium alloys such as AA7075-T6. However, hook defects—microstructural discontinuities at the weld interface—can significantly compromise joint integrity. Additionally, variations in heat input during welding influence microstructure evolution and mechanical properties. This study investigates the influence of process parameters and the hook defect on the quasi-static performance of AA7075-T6 RFSSW joints. Joints with various parameter combinations were analysed using optical microscopy, electron backscatter diffraction, tensile lap shear testing, and microhardness mapping, alongside thermocouple measurements of process temperatures. A semi-quantitative heat input model was developed to provide new insights into thermal characteristics and their effects on microstructural evolution. The obtained results show a decrease in ultimate lap shear force for high upward or downward-directed hooks. A welding time of 4 s and rotational speed of 2200 rpm resulted in optimal joint performance, achieving an ultimate lap shear force of 12.2 kN and sufficient heat input to prevent refill defects. Extended welding durations led to overheating and additional defects in the stir zone, while low welding time or rotational speed significantly influenced welding temperatures, heat input, and microstructural characteristics at the shoulder plunge path periphery. The findings emphasise the critical role of dynamic recrystallisation in the resulting microstructures and their impact on mechanical performance. Fatigue strength of the optimised joints exceeds RFSSW joints reported in the literature, underscoring the effectiveness of the selected process parameters in enhancing joint durability. Furthermore, the established semi-quantitative heat input model links energy partitioning to defect formation and microhardness of the joints. This provides new insights into the RFSSW process and enables knowledge transfer to other RFSSW applications.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"348 ","pages":"Article 119180"},"PeriodicalIF":7.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regulation of PBF-LB/M melt pool oscillation behavior via beam shaping: A study based on time-frequency characteristics of coaxial radiation signals","authors":"Tao Zhu ,&nbsp;Xiangjun Xiang ,&nbsp;Qiang Gong ,&nbsp;Jiaxing Wen ,&nbsp;Lai Wei ,&nbsp;Tian Huang ,&nbsp;Hongkai Jin ,&nbsp;Changqiu Chen ,&nbsp;Huabin He ,&nbsp;Kaihua Sun ,&nbsp;Xianfeng Shen ,&nbsp;Shuke Huang","doi":"10.1016/j.jmatprotec.2025.119181","DOIUrl":"10.1016/j.jmatprotec.2025.119181","url":null,"abstract":"<div><div>Melt pool instability remains a critical barrier to the reliability of Powder Bed Fusion by Laser Beam Melting (PBF-LB/M). While beam shaping is a promising regulatory strategy, the underlying dynamic mechanisms governing its stabilizing effect are not yet fully resolved. By integrating in-situ radiation monitoring with multiphysics simulations on HR-2 austenitic stainless steel, this work systematically elucidates the intrinsic mechanism through which a flat-top beam mitigate melt pool oscillation. The research reveals that the uniform energy distribution of the flat-top beam fundamentally suppresses the steep temperature gradients within the melt pool and the consequent Marangoni convection, thereby significantly enhancing hydrodynamic stability. This stability was validated across multiple dimensions. Within a wide processing window (power 170–450 W, speed 500–1200 mm/s), the use of a flat-top beam, compared to a Gaussian beam, reduced the peak melt pool temperature by an average of 500°C and decreased the maximum fluid velocity by approximately 50 %. Crucially, this profound stabilization of the internal thermo-fluid dynamics is directly reflected in the time-frequency analysis of the real-time photodiode signal, which captures the thermal radiation emitted from the melt pool. The flat-top beam effectively filters out high-frequency (&gt;1 kHz) spectral energy by over 80 %, transforming the melt pool dynamics from a stochastic, high-frequency oscillatory state driven by intense convection to a predictable, low-frequency dominant regime. Ultimately, this study establishes and verifies a cascading physical mechanism: energy homogenization leads to the mitigation of temperature gradients and peak temperatures, which in turn suppresses Marangoni flow velocity and results in a transition of melt pool oscillations from high-frequency, erratic fluctuations to low-frequency, periodic ones. This work provides a critical theoretical basis and a frequency-domain diagnostic tool for leveraging beam shaping to achieve high-stability PBF-LB/M additive manufacturing.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"348 ","pages":"Article 119181"},"PeriodicalIF":7.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heterogeneity-induced ductile–brittle transition behavior in negative rake angle cutting of Al/SiCp composites","authors":"Wei Sun ,&nbsp;Zhenlong Cheng ,&nbsp;Yaohui Wang ,&nbsp;Dehui Liu ,&nbsp;Peiyao Sheng ,&nbsp;Kui Liu ,&nbsp;Junyun Chen ,&nbsp;Penghui Li","doi":"10.1016/j.jmatprotec.2025.119177","DOIUrl":"10.1016/j.jmatprotec.2025.119177","url":null,"abstract":"<div><div>The inherent heterogeneity of Al/SiCp composites caused by the limited synergetic deformation capacity between the soft Al matrix and the hard SiC particles alter the conventional ductile–brittle transition (DBT) behavior of SiC. The conventional DBT theory was originally developed for homogeneous materials. However, its applicability to Al/SiCp composites is significantly limited. Therefore, a deeper understanding of the unique DBT behavior induced by inherent heterogeneity is essential for achieving ductile-regime machining of Al/SiCp composites. This study systematically investigated the heterogeneity-induced DBT behavior of Al/SiCp composites and explored the effect of negative rake angle cutting on this behavior through plunge-cut experiments and molecular dynamics (MD) simulations. The experimental results indicate that the SiC particles at the heterogeneous interface (hetero-interface) experienced a sudden transition to a state with complete brittle-regime removal, bypassing the traditional DBT stage. However, the machined surface of SiC particles located away from the interface still underwent a normal DBT process. The MD simulations show that the abrupt brittle transition is attributed to the sustained crack propagation at the hetero-interface caused by an insufficient support for the SiC particles by the Al matrix. Both experimental and simulation results revealed that negative rake angle cutting enhanced the plastic deformation ability of the interfacial SiC particles, as evidenced by the high dislocation densities. Consequently, compared to that at a 0° tool rake angle, the brittle-regime removal at the hetero-interface was significantly postponed when the tool rake angle was negative, which was conducive to mitigating the interfacial edge collapse of SiC. Finally, a novel critical DBT distance is proposed to quantify the initiated location at the hetero-induced brittle removal of SiC particles, serving as an evaluation parameter for the magnitude of interfacial edge collapses. From this perspective, the particle-removal behavior of Al/SiCp composites cannot be solely determined using the traditional DBT depth; a comprehensive consideration of the critical DBT distance dominated by the interfacial heterogeneity is also required to achieve ductile-regime machining.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"348 ","pages":"Article 119177"},"PeriodicalIF":7.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of bypass cold wire spatial position on process stability and elemental transfer in submerged arc welding for in situ alloying","authors":"Zekun Yang ,&nbsp;Zhanli Yang ,&nbsp;Dakui Fei ,&nbsp;Yanxu Wang ,&nbsp;Guofu Wang ,&nbsp;Guangnan Zhao ,&nbsp;Xin Yuan ,&nbsp;Bing Lu ,&nbsp;Ziran Wang ,&nbsp;Kai Xu","doi":"10.1016/j.jmatprotec.2025.119179","DOIUrl":"10.1016/j.jmatprotec.2025.119179","url":null,"abstract":"<div><div>Achieving flexible and cost-effective in-situ alloying within multi-wire submerged arc welding (multi-wire SAW) represents a core challenge for manufacturing high-performance pipeline steels. This study systematically investigates how the spatial position of the alloying source (a bypass cold wire) relative to the energy source (the multi-arc system) governs the physical metallurgy during the welding process. The results reveal that the cold wire feeding position has a decisive influence on both process stability and metallurgical behavior. In this confined-arc process, the highest elemental recovery was counter-intuitively obtained in the most energy-intensive region—the coupled arc zone. However, this high-recovery process window was accompanied by severe arc instability (the average coefficient of variation for the main wire current increased from 4.20 % to 7.08 %, increasing by nearly 70 %), leading to significant chemical segregation and microstructural degradation. To explain this anomalous phenomenon and resolve the aforementioned conflict, this work proposes the \"Arc Cavity Confined Reaction\" model. This model, for the first time, scientifically demonstrates from the dual mechanisms of physical confinement and chemical protection how the flux-formed cavity transforms conventional arc burn-off\" into a controlled \"evaporation-confinement- recondensation\" cycle, thereby amending the applicability of classical loss theories in confined-arc processes. Based on this theoretical framework, the \"molten pool stabilization zone\" behind the arcs was ultimately identified as the optimal process window to decouple elemental recovery from process stability, under which condition the weld metal's low-temperature impact toughness (-10°C) reached 165.7 J. This work fundamentally advances the understanding of elemental mass transfer in confined-arc environments, providing a new theoretical framework and critical process guidelines for all advanced materials processing technologies that rely on slag protection.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"348 ","pages":"Article 119179"},"PeriodicalIF":7.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser-induced cold metal transfer arc deflection under sidewall constraints: A novel strategy for enhanced sidewall fusion in thick-plate ultra-narrow-gap welding","authors":"Xiangchen Fan ,&nbsp;Guoliang Qin ,&nbsp;Guodong Liang ,&nbsp;Huijun Xu ,&nbsp;Xueyang Guo","doi":"10.1016/j.jmatprotec.2025.119194","DOIUrl":"10.1016/j.jmatprotec.2025.119194","url":null,"abstract":"<div><div>In laser-arc hybrid welding, there is a strong coupling effect between the laser and the arc, which is also known as the laser-induced effect. In our studies, the changes of the cold metal transfer (CMT) arc shape were realized by the laser-induced effect, and the influences of different parameters on this effect were systematically investigated. Our experimental results indicate that wire feeding speed significantly influences welding stability, while laser-arc distance in Y-direction is the key parameter for achieving arc lateral deflection and obtaining induced welds. Within an appropriate laser-arc distance range, the arc can be laser-induced to deflect laterally to one side. So, the deflection phenomenon of the CMT arc can be used in an ultra-narrow-gap (≤ 8 mm) welding process. In this scenario, the CMT arc can deflect towards the sidewall without bending or rotating the welding wire. The laser-induced effect allows the CMT arc to heat the sidewall in conjunction with the laser, thereby achieving sufficient sidewall penetration. High-quality induced welds with sufficient sidewall penetration are obtained within the laser-induced range. Meanwhile, the sidewall space constraints within the narrow-gap grooves enhance the laser-induced range, thereby improving the applicability of this technology. Finally, this technology achieved a 30 mm thick ultra-narrow-gap weld with sufficient sidewall penetration, good formability, and low heat damage. These studies support the research and development of the laser-CMT hybrid ultra-narrow-gap welding process of thick plates in industrial applications.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"348 ","pages":"Article 119194"},"PeriodicalIF":7.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A powder-bed in-situ modification strategy for surface quality enhancement in laser powder bed fusion: A case study on oxide ceramics","authors":"Yuji Li ,&nbsp;Jin Huang ,&nbsp;Zhenghua Liu ,&nbsp;Delong Shi ,&nbsp;Beining Li ,&nbsp;Weiwei He ,&nbsp;Fanbo Meng","doi":"10.1016/j.jmatprotec.2025.119184","DOIUrl":"10.1016/j.jmatprotec.2025.119184","url":null,"abstract":"<div><div>In the Laser Powder Bed Fusion (LPBF) forming process of oxide ceramics, Due to the inherently loose structure of the powder bed and the poor thermal conductivity of oxide ceramics, issues such as intense melt pool spattering and uneven melting/solidification frequently arise. To address this challenge, this study proposes an in-situ modulation and modification strategy for the powder bed. Thermal and kinetic models were established to analyze the melting process of the modified powder bed, and multi-scale validation was conducted in conjunction with experimental work.The modified powder bed demonstrates significant suppression of melt pool spattering behavior.Compared with the unmodified control samples, the modified components exhibited reductions in surface roughness values Ra and Rz by 88.6 % and 28.6 %, respectively. In-depth mechanistic analysis revealed that the auxiliary materials infiltrated the interparticle gaps by capillary forces, and sol gelation substantially enhanced the interparticle bonding strength. This phenomenon effectively restrained the particle spattering dynamics under recoil pressure. Concurrently, the incomplete combustion of benzyl alcohol generated an in situ nanoscale carbon layer on the powder bed surface, reducing the melt-pool temperature gradients. This phenomenon weakens the Marangoni convection intensity driven by the surface tension gradients, thereby extending the time window for melt spreading and leveling. The in-situ powder bed modulation and modification strategy provides a new theoretical basis for improving the forming quality and microstructural optimization of oxide ceramic components fabricated by LPBF. Importantly, this strategy offers a novel process pathway for addressing melt pool instability and defect control in LPBF of various material systems.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"348 ","pages":"Article 119184"},"PeriodicalIF":7.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cold manufacturing of metallic glass-based composites by ultrasonic vibrations","authors":"Luyao Li ,&nbsp;Yu Zhang ,&nbsp;Jinbiao Huang ,&nbsp;Zhe Chen ,&nbsp;Xiangyang Yu ,&nbsp;Wei Li ,&nbsp;Jiasen Sun ,&nbsp;Kangyu Lin ,&nbsp;Chenchen Yuan ,&nbsp;Jiang Ma","doi":"10.1016/j.jmatprotec.2025.119178","DOIUrl":"10.1016/j.jmatprotec.2025.119178","url":null,"abstract":"<div><div>The design of materials with desirable and tailorable properties is a long-standing goal within materials science, where composites represent a key strategy. However, a central dilemma in conventional composite manufacturing is that the thermal energy required to form strong interfacial bonds often simultaneously induces detrimental side effects, including interfacial reactions and reinforcement degradation. To resolve this generic conflict, we introduce a versatile \"cold manufacturing\" strategy utilizing metallic glasses as matrices. By exploiting an athermal ultrasonic vibration mechanism—which induces transient liquid-like behavior in metallic glasses without thermal activation—we achieve seamless interfacial bonding across diverse conductors, insulators, metals, and non-metals via oxide-layer-penetrating diffusion at ambient conditions. Crucially, successful fabrication underwater and in liquid nitrogen definitively demonstrates the technique's purely athermal nature, avoiding any thermal degradation pathways. By tuning metallic glasses binder ratios and additive compositions, we precisely engineer mechanical properties (Vickers hardness: 400–1450 HV) and magnetic response (saturation magnetization: 0–158.6 emu/g), forming robust bonds. This work thus establishes a versatile and fundamentally distinct composite manufacturing platform, opening a generic pathway to multifunctional composites free from the intrinsic limitations of heat.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"348 ","pages":"Article 119178"},"PeriodicalIF":7.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of laser energy on surface deformation mechanism of Nickel-based single-crystal superalloy subject to Laser shock peening","authors":"Min Dou ,&nbsp;Shouyi Sun ,&nbsp;Huitao Chen ,&nbsp;Tianyu Yuan ,&nbsp;Xinmei Wang ,&nbsp;Lei Li","doi":"10.1016/j.jmatprotec.2025.119173","DOIUrl":"10.1016/j.jmatprotec.2025.119173","url":null,"abstract":"<div><div>This study investigates the effects of Laser Shock Peening (LSP) on the mechanisms of surface plastic deformation in nickel-based single-crystal (NBSC) superalloys. After LSP at 5–9 J, no grain boundaries are introduced, and the single-crystal (SC) characteristics of the material are still retained. Severe plastic deformation occurs accompanied by the formation of a millimeter-scale work-hardened layer (the hardness could increase by 53.8%). In addition, the periodic structures formed on the surface lead to a maximum increase in surface roughness by approximately 8.1-fold. The deformed surface layer comprises a severe plastic deformation layer (SPDL) and a mild plastic deformation layer (MPDL). Within the SPDL, LSP activates the {111}&lt;110&gt; octahedral slip systems, generating high-density &lt;110&gt;-oriented cross-slip bands and characteristic dislocation configurations such as stacking faults (SFs), dislocation walls (DWs), dislocation tangles (DTs), and dislocation networks, thereby increasing the geometrically necessary dislocation (GND) density. At 10 J, localized remelting zones caused by thermal effects are also involved in the plastic deformation process, resulting in a reduction in the SPDL depth and GND density. Nevertheless, the γ matrix phase exhibits a significantly higher dislocation density than the γ' precipitate phase for all LSP-treated samples. This discovery provides critical mechanistic support and parameter guidance for the engineering applications of LSP in the precise surface modification of SC alloys.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"348 ","pages":"Article 119173"},"PeriodicalIF":7.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser additive manufactured high thermal conductivity Cu-GNPs/AlSi7Mg composite based on powder preparation and remelting strategy","authors":"Yuqing Liu ,&nbsp;Jiawen Luo ,&nbsp;Zhe Feng ,&nbsp;Siyu Zhang ,&nbsp;Zhiwei Hao ,&nbsp;Yijie Peng ,&nbsp;Wei Fan ,&nbsp;Hua Tan ,&nbsp;Fengying Zhang ,&nbsp;Xin Lin","doi":"10.1016/j.jmatprotec.2025.119176","DOIUrl":"10.1016/j.jmatprotec.2025.119176","url":null,"abstract":"<div><div>Coated-graphene nanoplatelets (GNPs) can effectively reduce graphene agglomeration and enhance the thermal conductivity of aluminum metal matrix composites (AMMCs). Thus, laser additive manufacturing (LAM) of coated-GNPs reinforced AMMCs holds great promise for producing lightweight, high thermal conductivity, and complex thermal management structures. However, current powder preparation processes lead to graphene agglomeration, limiting thermal conductivity improvement. Moreover, laser remelting can potentially enhance metallurgical quality and thermal conductivity. Therefore, this study develops LAM-processed Cu-GNPs/AlSi7Mg composite based on optimized powder preparation and remelting strategy. Under combined ultrasonic oscillation and mechanical stirring, 0.5 wt% and 1.5 wt% Cu-GNPs/AlSi7Mg composites (containing 0.1 wt% and 0.3 wt% GNPs) were prepared using chemical Cu plating. The combined mixing ensured uniform graphene dispersion and improved powder flowability, while remelting further reduced defects and enhanced densification. The Cu-GNPs distributed along the grain boundaries promoted component supercooling, resulting in grain refinement and proportion increase of equiaxial grains. Both Cu-GNPs and remelting raised the proportion of heat-affected zones (HAZ) per unit area, where fractured Al-Si eutectic and precipitated Si resulted in lower thermal resistance. In addition, Cu-GNPs established phonon conduction pathways at boundaries, thereby improving grain boundary heat transfer efficiency. Consequently, at 25°C, the thermal conductivity of 1.5 wt% Cu-GNPs/AlSi7Mg reached 156.4 W/(m·K), representing an increase of 23.9 % over AlSi7Mg. Through the synergistic optimization of dispersion, interfacial bonding strength, and metallurgical quality, the thermal conductivity of LAM-ed AlSi7Mg and other Cu-coated GNPs-reinforced systems is effectively improved. This paper provides critical theoretical and technical foundations for engineering applications of thermal management structures.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"348 ","pages":"Article 119176"},"PeriodicalIF":7.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stress-aware graph neural network for springback prediction considering material variations","authors":"Hui Wang ,&nbsp;Heonyong Lim ,&nbsp;Jeong Whan Yoon","doi":"10.1016/j.jmatprotec.2025.119189","DOIUrl":"10.1016/j.jmatprotec.2025.119189","url":null,"abstract":"<div><div>Accurate prediction of springback is crucial for quality control in sheet metal forming, especially when available limited data constrains the use of conventional data-driven methods. As the first attempt to apply for Graph Neural Network (GNN) to sheet metal forming process considering material variations, this study newly proposes a graph-based deep learning framework, which leverages Graph Attention Networks to predict nodal coordinates and state variables including stress components, equivalent plastic strain etc. across the part. A two-stage training strategy is introduced to enhance the model’s physical consistency by incorporating stress components as auxiliary targets, while GNN mechanism enables adaptive encoding of material influence on stress distribution. This work advances the fundamental understanding of metal forming by representing the stress–strain–geometry interaction as a spatially connected network, establishing a quantitative link between local mechanical response and global springback behavior. Beyond the case-specific prediction, this study reveals a generic relationship between the spatial evolution of stress–strain fields and the resulting geometric deviation, demonstrating that such physically coupled behavior can be effectively represented through graph topology. This finding provides a generalized framework for modeling deformation–relaxation phenomena in various forming processes. Comparative results show that the proposed framework outperforms a baseline artificial neural network, achieving higher accuracy despite the limited dataset of 256 simulations, and offers strong potential for process optimization and intelligent forming design.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"348 ","pages":"Article 119189"},"PeriodicalIF":7.5,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}