Journal of Materials Processing Technology最新文献

{"title":"Investigation on the movement mechanism of reinforcements during the melt static holding of SiCp-Cf/Al matrix composites","authors":"Yuncong Shang ,&nbsp;Wenda Zhang ,&nbsp;Hongbin Liu ,&nbsp;Erbao Guo ,&nbsp;Zhiqiang Guo ,&nbsp;Hong Xu","doi":"10.1016/j.jmatprotec.2025.118983","DOIUrl":"10.1016/j.jmatprotec.2025.118983","url":null,"abstract":"<div><div>The distribution of reinforcements in the melt is a key factor influencing the preparation of high-performance aluminium matrix composites by stir casting. The movement behaviour mechanism of hybrid reinforcements in melt remains unclear due to the significant density differences between silicon carbide, carbon fiber, and the Al matrix, hindering the fabrication of high-performance hybrid reinforced Al matrix composites. Therefore, this paper employs the stirred casting method to prepare a SiC_p-C_f/Al matrix composite melt. The effects of different reinforcement additions, melt static holding temperatures, and vacuum environments on the reinforcement movement behaviour were investigated. The results indicate that under atmospheric conditions, both SiC particles and carbon fibers exhibit upward flotation in the melt. An increase in the amount of reinforcement leads to a higher collision frequency and greater frictional resistance during particle movement, thereby slowing the flotation of the hybrid reinforcement. Increasing the static holding temperature enhances the Brownian motion of the reinforcements and reduces the melt viscosity, thereby decreasing the constraints on reinforcement movement and accelerating the flotation of the hybrid reinforcement. Vacuum-assisted stir casting demonstrates that reducing gas entrapment effectively mitigates the flotation of reinforcements. The reinforcement surfaces are wrapped by a micro-bubble layer, resulting in a combined density of the reinforcement and bubble layer that is lower than that of the melt, thereby causing the upward flotation of reinforcements. This study provides theoretical guidance for the preparation of novel hybrid reinforced Al matrix composites.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"343 ","pages":"Article 118983"},"PeriodicalIF":6.7,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144657050","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":"Excellent isotropic mechanical properties of electron beam melted H13 tool steel: Process optimization and microstructural control","authors":"Jiaqi Deng,&nbsp;Gengjie Wang,&nbsp;Hongjun Qi,&nbsp;Hanyu Ma,&nbsp;Zhifu Huang","doi":"10.1016/j.jmatprotec.2025.118980","DOIUrl":"10.1016/j.jmatprotec.2025.118980","url":null,"abstract":"<div><div>Additive manufacturing (AM) has revolutionized the fabrication of intricate steel components. However, anisotropic mechanical behaviors in AM-fabricated components remains a critical challenge, particularly for tool steels like H13, where repeated thermal cycling and complex solidification induce strong texture and microstructural heterogeneity. This study introduces a tailored electron beam melting (EBM) process to achieve isotropic mechanical properties by optimizing the volumetric energy density (<em>VED</em>) parameters. Systematic experiments are conducted to investigate the effects of varying <em>VEDs</em> on the defect formation, phase fraction, and grain morphology in H13 steel. Controlled energy input suppresses columnar grain development by modulating the solidification conditions, promoting the formation of a refined interwoven martensite-bainite matrix with minimal porosity. A predictive model correlating martensite/bainite fraction and grain scale to mechanical strength was established and experimentally validated. An optimal <em>VED</em> range (39.2 – 40.8 J/mm³) is identified, which weakens the crystallographic texture while enhancing the microstructural homogeneity. The optimized EBM- fabricated H13 steel exhibits isotropic tensile properties, including a yield strength of 1350 MPa, ultimate tensile strength of 1800 MPa, and elongation of 10 %, making it ideal for demanding engineering applications. The remarkable mechanical properties are attributed to the synergistic effects of high-density dislocations, precipitation strengthening, and grain refinement. This work not only provides an intrinsic process pathway to overcome anisotropy in AM-fabricated H13 steel, but also offers a transferable framework for microstructural control and performance prediction in other multi-phase alloys fabricated via AM.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"343 ","pages":"Article 118980"},"PeriodicalIF":6.7,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144623828","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 thermal uniformity-based downward directional solidification technology for controlling the hysteresis effect during solidification of single-crystal turbine blades","authors":"Fu Wang ,&nbsp;Yan Shang ,&nbsp;Yang Liu ,&nbsp;Weining Xie ,&nbsp;Qiang Yang ,&nbsp;Dichen Li ,&nbsp;Dexin Ma ,&nbsp;Zaiwang Huang ,&nbsp;Jiantao Wu","doi":"10.1016/j.jmatprotec.2025.118984","DOIUrl":"10.1016/j.jmatprotec.2025.118984","url":null,"abstract":"<div><div>The hysteresis effect is an essential characteristic that arises during the directional solidification of single crystal (SC) castings when using traditional processes that employ circular molds and drum-shaped heating and cooling systems. This effect is primarily responsible for the formation of freckles and stray grain defects in the SC castings, contributing to a high rejection rate. To effectively control the hysteresis effect, this paper proposes a novel thermal uniformity-based downward directional solidification (TUDWDS) technology. This process is systematically compared with a conventional high-rate solidification (HRS) process in terms of controlling freckle and stray grain defects, validating its capability to manage the hysteresis effect through both experimental and simulation methods. The results indicate that the TUDWDS process completely eliminates freckles by preventing longitudinal solute convection due to its solidification mode aligning with gravity. Additionally, its parallel heating and cooling systems provide a more uniformly distributed temperature field compared to the HRS process, significantly reducing stray grains in SC castings. These findings suggest that the TUDWDS process exhibits a strong capability to control the hysteresis effect. Moreover, the novel process facilitates stronger heat transfer directions, which enhances the overall heat exchange effect and thermal gradients during the directional solidification, further mitigating the defects associated with lower thermal gradients. Therefore, this process shows promising potential for widespread use in the industrial production of SC castings.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"343 ","pages":"Article 118984"},"PeriodicalIF":6.7,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605320","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":"Interlayer plastic deformation in additive manufacturing: Is more deformation better?","authors":"Abeer Mithal ,&nbsp;Vijay shankar Sridharan ,&nbsp;Nicholas Yew Jin Tan ,&nbsp;Sarah Jiawen Ng ,&nbsp;Youxiang Chew ,&nbsp;Niroj Maharjan ,&nbsp;Upadrasta Ramamurty ,&nbsp;Sridhar Idapalapati","doi":"10.1016/j.jmatprotec.2025.118982","DOIUrl":"10.1016/j.jmatprotec.2025.118982","url":null,"abstract":"<div><div>Introducing plastic deformation via interlayer hammer peening (IHP) is an attractive method of inducing local grain refinement in alloys that are additively manufactured using techniques such as directed energy deposition (DED). In the present work, various IHP strategies were applied to DED Inconel 625. The high degree of deformation induced by IHP caused recrystallization to occur which resulted in the formation of a fine grain structure with an average grain size of ∼3 μm. The subsequent layer deposited on the deformed layer, also had a finer as-solidified grain structure. Results showed that a critical deformation level was required for the recrystallization to occur, below which a high dislocation density was maintained with no equiaxed grain formation. Quantitative analysis of the strengthening mechanisms revealed that dislocation strengthening was dominant relative to grain boundary strengthening. A moderate deformation energy input of 556.3 mJ/mm² was found to be more effective in increasing the hardness of the deposited material, by limiting recrystallization. In contrast, greater deformation energy input triggered extensive recrystallization, resulting in the formation of softer regions. These findings underscore the complex interplay between the interlayer deformation conditions and resulting mechanical properties and emphasize that more interlayer plastic strain is not universally beneficial.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"343 ","pages":"Article 118982"},"PeriodicalIF":6.7,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633209","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":"Tuning the microstructures and mechanical properties of heterostructured steel fabricated via arc-based directed energy deposition and hot rolling","authors":"Junqiang Xu ,&nbsp;Qi Zhou ,&nbsp;Yong Peng ,&nbsp;Jian Kong ,&nbsp;Ningning Liang ,&nbsp;Mingcai Pan ,&nbsp;Kehong Wang","doi":"10.1016/j.jmatprotec.2025.118985","DOIUrl":"10.1016/j.jmatprotec.2025.118985","url":null,"abstract":"<div><div>Heterostructured (HS) steels have attracted significant attention because of their excellent comprehensive mechanical properties. However, significant challenges remain, including controlling the distribution of heterogeneous regions, regulating microstructures, and developing efficient manufacturing processes. In this study, an HS steel composed of 18Ni300 maraging steel (MS) and 316 L stainless steel (SS) was fabricated via a combined arc-based directed energy deposition (DED-Arc) and hot rolling process. This approach enabled controlled distribution and adjustable thickness of heterogeneous regions. The HS steel was hot rolled from an initial thickness of 20 mm down to 2 mm and then aged at 500°C for different durations. It retained its heterogeneous structures throughout, demonstrating the feasibility of the proposed processing route. As the aging time increased, both the amount and size of nanoprecipitates within the MS tracks progressively increased. However, the strength of the HS steel initially increased and subsequently decreased, achieving an optimal balance between strength and ductility after aging for 6 h. The enhanced strength is attributed to precipitation strengthening and the heterodeformation-induced (HDI) hardening effects occurring at the heterogeneous interfaces. As the size of the nanoprecipitates increased, the deformation mechanism transitioned from shear mechanism to the Orowan mechanism, which inhibited strain within the martensitic regions near the interface. Strain partitioning at the interface facilitated increased dislocation generation on the austenitic side, leading to a maximum back stress of 954 MPa in the HR-A6 sample. This study contributes to the understanding of strengthening mechanisms in HS steels and proposes an efficient approach for fabricating high-performance HS materials.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"343 ","pages":"Article 118985"},"PeriodicalIF":6.7,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632025","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":"Material removal mechanism in ultra-precision grinding of hard and brittle materials using small ball-end diamond grinding wheel","authors":"Biao Qin ,&nbsp;Henan Liu ,&nbsp;Jian Cheng ,&nbsp;Jinchuan Tian ,&nbsp;Jiangang Sun ,&nbsp;Guang Chen ,&nbsp;Zican Yang ,&nbsp;Mingjun Chen","doi":"10.1016/j.jmatprotec.2025.118977","DOIUrl":"10.1016/j.jmatprotec.2025.118977","url":null,"abstract":"<div><div>Small ball‐end fine-grained diamond grinding wheel offers notable advantages in the ultra-precision grinding of small complex curved-surface components, owing to their excellent machining flexibility and material removal capability. Reducing abrasive grain size is considered an effective strategy for achieving plastic-regime removal of hard and brittle materials while suppressing subsurface damage. However, the material removal mechanism during the machining of hard and brittle materials using small ball-end grinding wheels remains inadequately understood, thereby limiting their broader application in ultra-precision machining. In this study, fused silica, a representative hard and brittle material, was selected to investigate the influence of abrasive grain size on surface integrity and grinding characteristics. The results demonstrated that although the finer-grained grinding wheel produced excellent surface quality, it induced significant ploughing effects during grinding, which reduced material removal efficiency, accelerated grinding wheel wear, and increased grinding force. Furthermore, single-grain SPH scratching simulation and stress field analysis were conducted to clarify the subsurface damage evolution of fused silica under different abrasive grain sizes. Moreover, the damage mechanisms in both plastic-regime and brittle-regime removal modes when using small ball-end grinding wheels were revealed through TEM analysis. Finally, grinding experiments on typical small complex curved-surface components, hemispherical resonators, were performed to validate the feasibility of abrasive grain size modulation in practical machining. This study establishes a damage mechanism framework for grinding of hard and brittle materials using small ball-end grinding wheels, providing both theoretical and process guidance for low-damage precision machining of small complex curved-surface components.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"343 ","pages":"Article 118977"},"PeriodicalIF":6.7,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632024","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":"Achieving ultrahigh-strength Cu sintering joints prepared by ultrasonic spraying of thin Cu nanoparticle films","authors":"Xiuqi Wang ,&nbsp;Zheng Lian ,&nbsp;Dashi Lu ,&nbsp;Mingyu Li ,&nbsp;Hongjun Ji","doi":"10.1016/j.jmatprotec.2025.118981","DOIUrl":"10.1016/j.jmatprotec.2025.118981","url":null,"abstract":"<div><div>The application of nanoparticle sintering technology for third-generation semiconductor packaging is usually hindered by the difficulty in volatilization of organic vehicles, the nanoparticle (NP) agglomeration of its solder paste zone, and poor mechanical properties due to the inherent pores/cracks. In this work, these obstacles can be overcome using ultrasonic-spraying Cu NP film and vacuum thermal-pressure sintering. This work first controlled the ultrasonic spraying process parameters (power, flow, pressure) to achieve uniform and stable atomization effects yielding a homogeneous Cu NP film. The Cu NP film was further employed to realize Cu die-Cu substrate interconnection, and the microstructure and mechanical properties of the sintering joints was emphatically analyzed. Results demonstrate that near-monolayer fine Cu sintering structures are successfully produced. The sintering joints have good interfacial bonding ratio (∼ 94 %) and low porosity (∼ 1.6 %), resulting in shear strengths of up to 120.1 MPa. Even when sintering at 250 °C, the shear strength can reach 96.1 MPa. Because of the \"contact activation effect\" and the removal of interfacial cracks, these ultrasonic-spraying samples are stronger than printing sintering joints (with cracks) under the same sintering processes. We expect this approach to improve the performance of the sintering joints and broaden the application of Cu NP films, the microstructure of which less dependent on paste composition and sintering procedure (temperature, pressure, and time, etc.).</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"343 ","pages":"Article 118981"},"PeriodicalIF":6.7,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605318","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":"High-strength Ti-Mg interface with 3D interlocking structure via Ti mesh interlayer: fabrication, microstructure, and mechanical properties","authors":"Lun Yang,&nbsp;Wenbo Wang,&nbsp;Yunzhu Ma,&nbsp;Wensheng Liu,&nbsp;Zuosheng Li","doi":"10.1016/j.jmatprotec.2025.118979","DOIUrl":"10.1016/j.jmatprotec.2025.118979","url":null,"abstract":"<div><div>Composite materials combining titanium (Ti) and magnesium (Mg) alloys promise synergistic benefits—lightweight, high strength, corrosion resistance, and biocompatibility, but their development is stymied by the inability of Ti and Mg to form a strong metallurgical bond. To address this issue, a two-step method is proposed: first diffusion-weld the Ti mesh to the TC4 substrate, then hot-press sinter AZ91 Mg alloy into the mesh pores to form a three-dimensional(3D) interlocking interface. The resulting 3D interlock mechanically locks the two phases, redirecting load away from the inherently weak Ti-Mg phase boundary into the stronger Ti mesh and Mg matrix. Finite-element analysis and microstructural characterization confirm this transition from a planar to a volumetric stress field. Under optimized conditions, the interface attains a tensile strength of 147.8 MPa (66.8 % of the Mg matrix) and a shear strength of 110.5 MPa (84.8 % of the Mg matrix), substantially outperforming conventional flat-interface joints. Beyond the Ti-Mg system, this design paradigm can be extended to bond dissimilar metals with weak metallurgical affinity—or even metal-nonmetal hybrids—provided the 3D-skeleton phase remains intact during densification, thereby offering a generalized solution for high-performance interfaces in multi-material assemblies.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"343 ","pages":"Article 118979"},"PeriodicalIF":6.7,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632022","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":"Investigation on enhanced strength in W/(Ti/Cu) composite interlayer/steel diffusion bonding joint based on controlled diffusion mechanism","authors":"Zida Wang ,&nbsp;Shiqiang Zhang ,&nbsp;Jinghao Xu ,&nbsp;Zhihang Zhang ,&nbsp;Wei Shao ,&nbsp;Yue Zhao ,&nbsp;Jihua Huang ,&nbsp;Shuhai Chen ,&nbsp;Zheng Ye ,&nbsp;Wanli Wang ,&nbsp;Jian Yang","doi":"10.1016/j.jmatprotec.2025.118978","DOIUrl":"10.1016/j.jmatprotec.2025.118978","url":null,"abstract":"<div><div>The development of W/steel composite structures has become one of the focuses in the advancing nuclear fusion reactor cladding subassembly, leveraging the complementary strengths of both materials. The interlayers currently used in diffusion joining either fail to establish effective metallurgical bonding with the substrates or induce excessive reactions and leading to the formation of large number of brittle compounds. This makes it difficult to meet the strength requirements of the W/steel composite structure. Considering a controlled chemical reaction at the interface is beneficial for improving metallurgical bonding, the “controlled diffusion” concept was proposed in this work. Specifically, a Ti/Cu composite interlayer with thin Ti foil and thick Cu foil was employed for diffusion bonding steel and W with the double-layer sandwich structure of steel substrate/Cu/Ti/W substrate. The Ti interlayer diffuses through the Cu interlayer and reacts with the steel substrate under appropriate interlayer thickness design and processing conditions to promote metallurgical bonding at the Cu interlayer/steel substrate interface. The activity of Ti is fully utilized to address the challenge of forming a strong bond between the Cu layer and the steel substrate, while reducing thermal stresses in the joint and preventing excessive formation of brittle intermetallic compounds. Finally, the high-performance W/steel composite structure (tensile strength of 280.7 MPa) with a Ti/Cu composite interlayer were successfully prepared based on controlled diffusion mechanism. This work provides a novel interlayer design concept and mechanistic insight for improving the diffusion bonding quality of dissimilar materials in high-performance structural applications.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"343 ","pages":"Article 118978"},"PeriodicalIF":6.7,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605317","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":"The influence of slight energy density variation within the optimized parameters scope on the grain growth, precipitation behavior and mechanical property of laser direct energy deposited AA7075 alloy","authors":"Jiming Lv,&nbsp;Haifei Lu,&nbsp;Kaiyu Luo,&nbsp;Jinzhong Lu","doi":"10.1016/j.jmatprotec.2025.118976","DOIUrl":"10.1016/j.jmatprotec.2025.118976","url":null,"abstract":"<div><div>The laser direct energy deposition (LDED) of high-strength AA7075 alloy is highly challenging owing to its inherent cracks and porosity, exhibiting narrow low-defect processing window. Meanwhile, its precipitate behavior and dislocation density, the primary source of strength, are significantly influenced by the slight variation of energy density. Therefore, this study firstly explored the operatable parameter scope for the crack-free and low-porosity fabrication of AA7075 alloy through the stepwise regulation of single-track, single-layer, and multi-layer deposition. Results indicated that the porosity was strongly related to the mass flow rate, while the pore type was more affected by energy density. Subsequently, the effects of energy densities on microstructural evolution and mechanical properties were explored among this scope. The average grain size, aspect ratio, texture intensity, and internal strain were all enhanced with the increase of energy densities, while the density of geometrically necessary dislocations peaked at 155.6 W/mm². The point-shaped coherent precipitates pinning dislocations identified as η/η' phase of MgZn₂ were observed under the energy density of 155.6 W/mm², while the stripe-shaped non-coherent precipitates identified as S phase of Al₂CuMg dominated under the energy density of 183.9 W/mm². The precipitation behavior models under different energy densities were then obtained through the LDED thermal history analysis. The largest ultimate tensile strength of ∼347.7 MPa occurred at 155.6 W/mm²-2 mg/mm², which can be attributed to the joint effect of its relatively low porosity, fine grain size, high dislocation density, denser precipitation distribution and η/η' phase pinning dislocation structure. This study reveals the evolution pattern of grain growth, precipitate, and mechanical property of AA7075 alloy among the optimized parameters scope, providing a feasible solution for its in-situ microstructural regulation.</div></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":"343 ","pages":"Article 118976"},"PeriodicalIF":6.7,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605321","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}