Journal of Materials Research and Technology-Jmr&t最新文献

Investigation on microstructure and corrosion behavior of selective laser melted 316L stainless steel at various high-speed deformation levels 选择性激光熔化316L不锈钢在不同高速变形水平下的组织和腐蚀行为研究

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-30 DOI: 10.1016/j.jmrt.2025.07.274

Shaohua Zhang , Lijing Wang , Baosheng Liu , Yinghui Wei , Lifeng Hou , Pengpeng Wu , Xiaoxia Ren , Yuezhong Zhang , Huihu Lu

{"title":"Investigation on microstructure and corrosion behavior of selective laser melted 316L stainless steel at various high-speed deformation levels","authors":"Shaohua Zhang , Lijing Wang , Baosheng Liu , Yinghui Wei , Lifeng Hou , Pengpeng Wu , Xiaoxia Ren , Yuezhong Zhang , Huihu Lu","doi":"10.1016/j.jmrt.2025.07.274","DOIUrl":"10.1016/j.jmrt.2025.07.274","url":null,"abstract":"<div><div>This study examines the impact of high-speed cold rolling deformation on the microstructure and corrosion resistance of selectively laser melted (SLMed) 316L stainless steel after solution treatment at 1100 °C for 0.25 h in a simulated proton exchange membrane fuel cell (PEMFC) cathode environment. The research aims to elucidate the mechanism by which high-speed plastic deformation affects the corrosion resistance of bipolar plates during operation, thereby providing theoretical foundations for the design of metallic bipolar plate materials and ensuring the safe operation of fuel cells. The findings demonstrate that a high-speed deformation rate of 50 % substantially improves corrosion resistance, largely attributable to the elevated presence of low-ΣCSL grain boundaries accounting for 49.4 %, thereby improving grain boundary stability and reducing corrosion susceptibility. Additionally, optimized dislocation density and an elevated O<sup>2−</sup>/OH<sup>−</sup> ratio of 0.69 contribute to a more effective passive film with superior protective properties. In contrast, excessively high-speed deformation at 70 % leads to deteriorated corrosion resistance, as the formation of martensite promotes micro-galvanic corrosion, while the reduced Cr<sub>2</sub>O<sub>3</sub> content in the passive film weakens its protective properties.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 768-781"},"PeriodicalIF":6.6,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748268","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}

引用次数: 0

Mechanistic insights into the high ductility and limited tension-compression asymmetry of Mg-0.7Sm-0.3Zr alloy Mg-0.7Sm-0.3Zr合金高延展性和极限拉压不对称的机理研究

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-30 DOI: 10.1016/j.jmrt.2025.07.282

Yuanxiao Dai , Zhongshan Li , Yaobo Hu

{"title":"Mechanistic insights into the high ductility and limited tension-compression asymmetry of Mg-0.7Sm-0.3Zr alloy","authors":"Yuanxiao Dai , Zhongshan Li , Yaobo Hu","doi":"10.1016/j.jmrt.2025.07.282","DOIUrl":"10.1016/j.jmrt.2025.07.282","url":null,"abstract":"<div><div>This study aims to elucidate the mechanisms underlying the high room-temperature ductility (EL: 44 %) and limited tension-compression asymmetry (CYS/TYS = 0.96) of a low-alloyed Mg-0.7Sm-0.3Zr (wt.%) alloy. Through a systematic investigation combining electron backscatter diffraction (EBSD) with quasi-in-situ tensile/compressive tests, the intra- and inter-granular deformation behaviors of the alloy were thoroughly examined. The results demonstrated that the extruded bar formed a distinctive fibrous bimodal grain structure with an average grain size of 3.77 μm. The high plasticity of the alloy is attributed to the rare-earth (RE) texture of a significant proportion of grains (69.7 % by area), which facilitates the activation of basal slip and subsequently promotes the coordinated activation of non-basal slip to accommodate deformation in later stages. Furthermore, the intergranular slip transfer behavior plays a crucial role in enhancing plasticity: the basal-to-basal (B–B) slip transfer alleviates stress concentrations, thereby inhibiting crack initiation. Although the basal-to-non-basal (B-nonB) slip transfer induces significant local stress concentrations, it still hinders crack propagation. Based on the experimental data, an equation for yield strength contribution was established: The difference between the calculated compressive and tensile yield strengths is 0.244<em>τ</em><sub>b</sub>-0.136<em>τ</em><sub>TT</sub> + 0.134<em>τ</em><sub>non-b</sub>. The RE texture reduces differences in tensile twinning activity under tension and compression, while grain refinement raises the critical resolved shear stress of tensile twinning beyond basal slip. These factors balance deformation mode variations, resulting in limited tension-compression asymmetry.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 807-822"},"PeriodicalIF":6.6,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748566","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}

引用次数: 0

Modeling and experimental comparison of residual stresses and microstructure in UNS S32507 welds using Gas Tungsten Arc and Laser Beam Welding processes 气体钨极弧焊和激光束焊接UNS S32507焊缝残余应力和显微组织的建模与实验比较

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-30 DOI: 10.1016/j.jmrt.2025.07.254

G. Surya Prakash Rao , Panchagnula Jayaprakash Sharma , Suresh Akella , Harinadh Vemanaboina , Jasvinder Singh , MVV Prasad Kantipudi , Chander Prakash , Khang Wen Goh , Dao Thanh Phong

{"title":"Modeling and experimental comparison of residual stresses and microstructure in UNS S32507 welds using Gas Tungsten Arc and Laser Beam Welding processes","authors":"G. Surya Prakash Rao , Panchagnula Jayaprakash Sharma , Suresh Akella , Harinadh Vemanaboina , Jasvinder Singh , MVV Prasad Kantipudi , Chander Prakash , Khang Wen Goh , Dao Thanh Phong","doi":"10.1016/j.jmrt.2025.07.254","DOIUrl":"10.1016/j.jmrt.2025.07.254","url":null,"abstract":"<div><div>This study presents a comparative analysis of Gas Tungsten Arc Welding (GTAW) and Laser Beam Welding (LBW) on UNS S32507 duplex stainless steel, emphasizing thermal behavior, microstructure, residual stresses, and mechanical performance. A finite element thermal analysis using a Gaussian heat source model was performed to predict heat distribution and cooling rates, which were experimentally validated through X-ray diffraction, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). GTAW produced a broader heat-affected zone (HAZ) with peak temperatures around 1968 °C, slower cooling rates, and tensile residual stresses up to 253 MPa. In contrast, LBW exhibited highly localized heating with fusion zone temperatures peaking at 2436 °C, faster cooling rates (>10<sup>3</sup> K/s), and lower residual stresses of 168 MPa. SEM/EDX revealed coarser dendritic grains in GTAW and refined columnar structures in LBW. Both methods maintained residual stresses within the yield strength limit (550 MPa), ensuring a safety factor of 2.0. Tensile tests revealed ultimate tensile strengths of 795 MPa for GTAW and 855 MPa for LBW joints, indicating superior mechanical properties and refined microstructure in LBW weldments. The refined microstructure and reduced residual stress in LBW underline its superior weld integrity.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 782-791"},"PeriodicalIF":6.6,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748269","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}

引用次数: 0

Theoretical explanation and regulation method for the edge effect in the sintered joints of metal nanoparticles 金属纳米颗粒烧结接头边缘效应的理论解释与调控方法

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-29 DOI: 10.1016/j.jmrt.2025.07.265

Guannan Yang , Zebo Li , Zhihao Zhang , Junyi Lu , Yu Zhang , Guanghan Huang , Tianshuo Zhao , Chengqiang Cui

引用次数: 0

Influence of surface micro-textured and coating on tungsten carbide tools in turning of aluminum alloy 7075-T6 7075-T6铝合金车削过程中表面微织构和涂层对碳化钨刀具性能的影响

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-29 DOI: 10.1016/j.jmrt.2025.07.266

Javad Shams Abadi Farahani, Behnam Davoodi

{"title":"Influence of surface micro-textured and coating on tungsten carbide tools in turning of aluminum alloy 7075-T6","authors":"Javad Shams Abadi Farahani, Behnam Davoodi","doi":"10.1016/j.jmrt.2025.07.266","DOIUrl":"10.1016/j.jmrt.2025.07.266","url":null,"abstract":"<div><div>Aluminum alloy 7075-T6, valued for its lightweight properties, high strength, and corrosion resistance, is widely used in the aerospace and automotive industries; however, it poses machining challenges, including the formation of built-up edges, tool wear, and heat-induced microstructural changes. These coatings degrade tool geometry and surface finish in turning operations. This study introduces a novel surface engineering approach that combines laser-induced micro-textures with a TiAlCr (C, N) nanostructured coating on tungsten carbide (WC–Co) tools to enhance turning performance. Micro-textures, created via a fiber laser (20 W, 1064 nm) with triangular grooves (100 μm depth, 150 μm pitch), were applied parallel to the cutting edge on the rake face, followed by a 3 μm thick coating deposited using physical vapor deposition (PVD) with a cathodic arc method. Experiments compared coated, textured, coated-textured, and chip-breaker tools against an as-received WC-Co control under dry, wet, and minimum quantity cutting fluid (MQCF) conditions at a feed rate of 0.2 mm/rev. Surface roughness (Ra) was measured using a contact profilometer, and tool morphology was analyzed via optical microscopy (OM). The TC tool under MQCF achieved the lowest surface roughness (Ra = 1.313 μm) and friction coefficient (μ = 0.19), which can be attributed to reduced tool-chip contact and enhanced fluid penetration through microchannels. OM confirmed minimal wear on TC tools. This approach significantly improves tool life (up to 25 % reduction in wear) and surface quality, offering a cost-effective solution for the precision machining of aluminum alloys.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 744-751"},"PeriodicalIF":6.6,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748266","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}

引用次数: 0

Atomic-scale origin and multiscale evolution of non-electrochemical dissolution of metals in molten salts 金属在熔盐中非电化学溶解的原子尺度起源与多尺度演化

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-29 DOI: 10.1016/j.jmrt.2025.07.262

Rui Yuan , Handong Jiao , Ruiyang Sun , Leyang Li , Qi Wang , Donghua Tian , Xuefeng Zhang , Dongbai Sun , Shuqiang Jiao

{"title":"Atomic-scale origin and multiscale evolution of non-electrochemical dissolution of metals in molten salts","authors":"Rui Yuan , Handong Jiao , Ruiyang Sun , Leyang Li , Qi Wang , Donghua Tian , Xuefeng Zhang , Dongbai Sun , Shuqiang Jiao","doi":"10.1016/j.jmrt.2025.07.262","DOIUrl":"10.1016/j.jmrt.2025.07.262","url":null,"abstract":"<div><div>Non-electrochemical dissolution (NED) of metals in melts is ubiquitous in daily life. Here, taking Ti dissolution in molten salts as an example, we decipher the mechanisms of NED of metals in molten salts. We discover that beyond the chemical dissolution, the unexpected physical dissolution appears in molten salts. The physical dissolution originates predominantly from atomic thermal fluctuations at elevated temperatures, which weaken metallic bonds and intensify ion collisions with the metal matrix. Moreover, preferential dissolution occurs not only at grain boundaries but also on a specific crystal plane, which is attributed to its stronger halide adsorption affinity. Furthermore, the synergistic interplay between preferential dissolution and residual stress release triggers the slip-dissolution process, causing the Ti surface morphology to gradually evolve into characteristic terraces and dents. The findings clarify the atomic-scale origin and multiscale evolution of NED of metals in molten salts, laying the foundation for precise regulation of metal dissolution.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 702-709"},"PeriodicalIF":6.6,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748258","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}

引用次数: 0

Comparative study on fretting wear damage mechanisms of 316L steel in dry air and liquid lead-bismuth eutectic environments 干空气和液态铅铋共晶环境下316L钢微动磨损损伤机理的对比研究

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-29 DOI: 10.1016/j.jmrt.2025.07.267

Qi Sun , Yu Qin , Haowen Tang , Qian Yang , Pengfei Yang , Xiaoqiang Fan , Minhao Zhu

{"title":"Comparative study on fretting wear damage mechanisms of 316L steel in dry air and liquid lead-bismuth eutectic environments","authors":"Qi Sun , Yu Qin , Haowen Tang , Qian Yang , Pengfei Yang , Xiaoqiang Fan , Minhao Zhu","doi":"10.1016/j.jmrt.2025.07.267","DOIUrl":"10.1016/j.jmrt.2025.07.267","url":null,"abstract":"<div><div>Due to flow induced vibration caused by coolant circulation, fretting wear inevitably occurs between fuel cladding, heat exchanger tubes and their holders in Gen IV lead-bismuth eutectic (LBE) cooled nuclear reactors. Focusing on this issue, in the current work, fretting wear behavior and damage mechanisms in air and LBE environments at 350 °C were comparatively investigated. The results reveal that both of the microstructures under fretting interfaces in these two environments are composed of third body layer (TBL) and plastic deformation layer (PDL). While, fretting wear damage in LBE environment is obviously more serious, due to the change of fretting wear mechanisms. In air environment, fretting damage is dominated by abrasive wear and oxidation wear. In contrast, delamination wear also plays a crucial role in LBE environment, which is related to the phase transformation from austenite to ferrite induced by the elective leaching of Ni. Accordingly, the possible reasons behind such a phenomenon were proposed and discussed. The results in this work are not only expected to better understand failure behavior of fretting wear in liquid LBE environment, but also provide a possible guide for selecting the optimal damage protection method.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 718-727"},"PeriodicalIF":6.6,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748262","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}

引用次数: 0

Strain rate sensitivity of TC4 alloy sheet under electrically-assisted tension: Mechanical responses and electroplastic mechanisms TC4合金片材在电助张力下的应变速率敏感性：机械响应和电塑性机制

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-28 DOI: 10.1016/j.jmrt.2025.07.242

Si-liang Yan , Lan-qing Yang , Lei Hu , Xiao-li Zhang , Wen-yao Wang , Ping Li , Miao Meng

{"title":"Strain rate sensitivity of TC4 alloy sheet under electrically-assisted tension: Mechanical responses and electroplastic mechanisms","authors":"Si-liang Yan , Lan-qing Yang , Lei Hu , Xiao-li Zhang , Wen-yao Wang , Ping Li , Miao Meng","doi":"10.1016/j.jmrt.2025.07.242","DOIUrl":"10.1016/j.jmrt.2025.07.242","url":null,"abstract":"<div><div>Electrically-assisted strain rate jump (EASRJ) tension and EA quasi-static tension under different electro-thermo-mechanical routes were conducted to investigate the strain rate sensitivity (SRS) related macro-micro features and electroplastic mechanisms of TC4 alloy sheet. Results reveal that yield stress and ultimate tensile stress decrease monotonically and flow softening as well as E-typed Portevin Le-Chatelier bands become notable with increasing current density at 0.0005 s<sup>−1</sup>. While the elongation first decreases, then increases and surpasses the current-free level and finally decreases with current density under the combined effect of electroplasticity and local Joule heating induced premature failure. Dynamic strain aging (DSA), electrically-induced dynamic recrystallization (DRX), slight α→β phase transformation and grain boundary deformation coordination under “hot spots” and charge imbalance effects are the featured microstructure evolution phenomena in quasi-static EA tension. According to the EASRJ tension results, SRS value is relatively low (0.01–0.02) in current-free case, it decreases to near zero at 10 A/mm<sup>2</sup> and increases sharply to 0.25–0.40 at 20 A/mm<sup>2</sup>. Lower ultimate strain rate results in lower grain size, higher β phase content and recrystallization rate up to 12.7 %, and thus slight divergence in SRS values at high current densities. The variation in deformation mechanisms and enhanced thermal activation effects synergistically cause this significantly increased SRS, and the controlled mechanisms with increasing current density are sequentially DSA, dislocation slip, intersection and rearrangement coordinated by mixed dynamic recrystallization (DRX) and grain boundary sliding (GBS).</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 474-489"},"PeriodicalIF":6.6,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724293","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}

引用次数: 0

Semi-crystalline design of SiB6-modified enamel coatings: Towards long-term synergistic resistance to hydrothermal corrosion sib6改性搪瓷涂料的半结晶设计：长期协同抗水热腐蚀

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-28 DOI: 10.1016/j.jmrt.2025.07.246

Xinchang Feng , Fangwei Guo , Wenchen Zhang , Qingfeng Zeng , Junning Li , Xiaofeng Zhao

{"title":"Semi-crystalline design of SiB6-modified enamel coatings: Towards long-term synergistic resistance to hydrothermal corrosion","authors":"Xinchang Feng , Fangwei Guo , Wenchen Zhang , Qingfeng Zeng , Junning Li , Xiaofeng Zhao","doi":"10.1016/j.jmrt.2025.07.246","DOIUrl":"10.1016/j.jmrt.2025.07.246","url":null,"abstract":"<div><div>Defects such as bubble pores and cracks of enamel coating accelerate failure in hydrothermal conditions. Here, a trace amount of SiB<sub>6</sub> modified enamel coating prepared at a low sintering temperature showed promising hydrothermal corrosion resistance at 80–600 °C. The semi-crystalline enamel coatings modified by 1 wt% SiB<sub>6</sub> demonstrated enhanced amorphization degree and exhibited a minimal mass change of ∼0.01 % after 480 h. Compared to the undoped coatings, both the equivalent coating electrochemical resistance and charge transfer resistance at the coating/substrate interface were increased by 2∼3 times. A significant amount of flocculent products sealed in the residual pores of the SiB<sub>6</sub> modified enamel coating during hydrothermal reaction process, preventing gaseous H<sub>2</sub>O to migrate to the interface of the steel substrate. This study highlights the synergistic optimization of the amorphous phase and residual stress to dynamically regulate the coating hydrothermal corrosion resistance through a strategic interplay of composition and microstructure design.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 728-743"},"PeriodicalIF":6.6,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748263","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}

引用次数: 0

Surface topology evolution induced by chip formation and microstructure features during machining γ-TiAl alloy with increasing uncut chip thickness γ-TiAl合金切削过程中切屑形成与微观组织特征的表面拓扑演变

IF 6.6 2区材料科学

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-28 DOI: 10.1016/j.jmrt.2025.07.244

Xin Liu , Hongguang Liu , Shijia Shi , Binbin Xu , Wei Zhang , Yuyang Tang , Jun Zhang , Wanhua Zhao

{"title":"Surface topology evolution induced by chip formation and microstructure features during machining γ-TiAl alloy with increasing uncut chip thickness","authors":"Xin Liu , Hongguang Liu , Shijia Shi , Binbin Xu , Wei Zhang , Yuyang Tang , Jun Zhang , Wanhua Zhao","doi":"10.1016/j.jmrt.2025.07.244","DOIUrl":"10.1016/j.jmrt.2025.07.244","url":null,"abstract":"<div><div>γ-TiAl alloy is a promising material with low density, high specific strength, and excellent high-temperature performance for aero-engine components. However, its intrinsic brittleness at room temperature poses significant challenges in manufacturing. This study conducted orthogonal cutting tests of Ti–46Al–5Nb-1.8Cr-0.2Ta-0.1B alloy at varying uncut chip thickness (UCT) and speeds to investigate its evolution of surface and subsurface features. The chip morphology transforms from segmented to completely fragmented with the increase of UCT. Brittle fractures easily occur under high strain rates, following the formation of gaps and internal cracks between and within segmentations of chips. Plastic deformation dominates the machining surface under the UCT below 20 μm; thus, a more favorable surface is obtained. The result indicates that the chip formation principle is governed by the interplay between adiabatic shear and brittle fracture. Besides, the severe chip sawtooth and periodic fracture-induced cutting force fluctuation and forced vibration of the cutting tool, retained on the surface morphology. Surface topography showed periodic marks and was accurately identified by the multiple signals, which reflected lower frequency and larger amplitude with a further increase in the UCT. Moreover, surface microcracks tend to propagate along γ/α2 lamellar and grain boundaries due to the highly anisotropic lamellar structure. The size and incidence of the tear and microcrack increased as the level of UCT increased. Those findings provide the basic understanding for efficient and high-performance processing of γ-TiAl alloy.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 792-806"},"PeriodicalIF":6.6,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748270","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}

引用次数: 0