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

{"title":"Effect of variations in peak and background currents during pulsed current gas tungsten arc welding on the dissimilar welded joint of ASTM A105-AISI 316L: Microstructural changes, mechanical properties and fracture mechanism","authors":"M. Sabzi,&nbsp;H.R. Jafarian,&nbsp;A. Abdollahzadeh,&nbsp;S.H. Mousavi Anijdan,&nbsp;A.R. Eivani","doi":"10.1016/j.jmrt.2025.09.162","DOIUrl":"10.1016/j.jmrt.2025.09.162","url":null,"abstract":"<div><div>The aim of this study was to investigate the effect of variations in peak (I_p) and background (I_b) currents during Pulsed Current Gas Tungsten Arc Welding (PCGTAW) on microstructural changes, significant improvement of mechanical properties and fracture mechanism of dissimilar welded joints of ASTM A105-AISI 316L. For this purpose, 12 mm thick AISI 316L stainless steel sheets and ASTM A105 steel sheets were welded together by PCGTAW process with I_p values of 180, 220 and 260A, and I_b values of 70, 110 and 150A. Optical microscopy, Field Emission Scanning Electron Microscopy (FE-SEM), Energy-Dispersive X-Ray Spectroscopy (EDS), and X-Ray Diffraction (XRD) were used to analysisthe microstructural and phase changes. Similarly, tensile, Vickers microhardness and Charpy impact tests were utilizedto evaluate the effect of changes in I_b and I_p currents on mechanical properties. The fracture mechanism after tensile and Charpy impact tests was investigated by FE-SEM. Microscopic studies indicated that the microstructure of the weld metal (WM) contained austenite dendrites with a small amount of grain boundary delta ferrite, to the extent that with increasing I_b and decreasing I_p, the microstructure of the WM was changed from columnar dendrites to extremely small and coaxial dendrites. Likewise, the increased I_b and decreased I_p reduced the size of dendrites as well as the amount of grain boundary delta ferrite in WM and sodidthe width of the heat-affected zone (HAZ) and partial melted zone (PMZ). The results of XRD analysis indicate the predominance of the austenite phasein WM. In the tensile test, all welded joints were fractured from the ASTM A105 steel side. The welded joints built up yield strength of approximately 250 ± 8 MPa, a tensile strength of around 484 ± 9 MPa, and a fracture strain close to 30 ± 2 %.The results of Charpy impact and microhardness tests showed that with increasing I_b and decreasing I_p, the hardness (from 250 ± 5 HV to 289 ± 4 HV) and fracture energy (from 140 ± 3 J to 173 ± 3 J) of WM are increased. Fractography of the fracture surfaces indicates the occurrence of fully ductile fracture in both tensile and Charpy impact tests.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 891-903"},"PeriodicalIF":6.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145121292","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":"Elucidating the effect of rotational speed on submerged friction-stir welding of AZ31C magnesium alloy","authors":"Ibrahim Sabry ,&nbsp;Majid Naseri ,&nbsp;Abdel-Hamid I. Mourad","doi":"10.1016/j.jmrt.2025.09.175","DOIUrl":"10.1016/j.jmrt.2025.09.175","url":null,"abstract":"<div><div>Herein, the submerged friction stir welding (SFSW) technique was employed to join an AZ31C magnesium alloy (6 mm thick) using a water medium. This work investigates the influence of rotational speed, i.e., 1000, 2000, and 3000 rpm, on microstructure and tensile properties. At 1000 rpm, minor tunnel-like defects appeared due to insufficient heat input. At 2000 rpm, the welds were largely 2000 rpm yielded the highest joint quality with nearly defect-free stir zones and the best balance of strength and hardness, whereas 1000 rpm showed minor tunnel-like defects and 3000 rpm suffered from severe voids, showing optimal properties, though microscopic oxide inclusions were occasionally noted. At 3000 rpm, excessive heat and turbulent flow caused significant void defects that reduced strength and stabilized subgrain microstructure, but a further increase to 3000 rpm reduced strength due to void defects. The stir zone (SZ) expanded at higher speeds, increasing hardness to 2000 rpm, peaking at 78 HV. Fractures were observed in the thermomechanical affected zone (TMAZ) at 1000 rpm and in the heat-affected zone (HAZ) at higher speeds. Maximum tensile strength (220 MPa) happened at 2000 rpm, while void defects at 3000 rpm reduced strength. These findings provide insights into optimizing SFSW for improved mechanical properties.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1080-1090"},"PeriodicalIF":6.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145121296","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 hybrid optimization method for determining laser cladding process parameters to control geometric morphology in CoCrFeNiMn high-entropy alloy","authors":"Xin Lei ,&nbsp;Yanbin Du ,&nbsp;Hongxi Chen ,&nbsp;Yunchuan Peng ,&nbsp;Wensheng Ma ,&nbsp;Jian Tu","doi":"10.1016/j.jmrt.2025.09.119","DOIUrl":"10.1016/j.jmrt.2025.09.119","url":null,"abstract":"<div><div>For precise control of laser-cladded CoCrFeNiMn high-entropy alloy coatings, a multi-algorithm hybrid optimization-based method for determining process parameters was developed. Using Latin hypercube experimental design, single-track cladding experiments on 316L stainless steel substrates systematically revealed three-dimensional response relationships among laser power, scanning speed, and powder feeding rate relative to coating dilution rate, aspect ratio, and wetting angle. A hybrid prediction model has been developed that integrates the Natural Residual Balance Optimizer (NRBO) with Deep Belief Networks (DBN), significantly enhancing the accuracy of complex nonlinear mappings between process parameters and geometric characteristics. Subsequently, an Adaptive Reference Vector Multi-objective Evolutionary Algorithm (ARMOEA) was applied to generate Pareto fronts aimed at optimizing the dilution rate and aspect ratio, while minimizing the wetting angle. An integrated evaluation method based on objective weighting was then utilized for global optimization of multidimensional solution sets. The geometric characteristics of the optimized coating were validated: The measured values using the optimal process parameters (<em>P</em> = 1265.95 W, <em>V</em> = 8.28 mm/s, <em>F</em> = 0.41 r/min) exhibited a deviation from the values predicted by the optimization model that was controlled within 6.01 %. This demonstrates the effectiveness of the proposed method. Compared to empirical parameter sets, this approach achieved a 44.2 % reduction in dilution rate, a 2.28 % improvement in aspect ratio, and a decrease in wetting angle to 49.5°. This methodology enabled quantitative optimization of morphological features in high-entropy alloy claddings through intelligent algorithmic collaboration, providing a data-driven decision paradigm for the development of laser additive manufacturing processes.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1038-1052"},"PeriodicalIF":6.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145121298","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":"Revealing interfacial properties and agglomeration characteristic of rare earth aluminate inclusion in molten steel","authors":"Yeguang Wang ,&nbsp;Chengjun Liu ,&nbsp;Ji Zhou ,&nbsp;Guandi Hao","doi":"10.1016/j.jmrt.2025.09.157","DOIUrl":"10.1016/j.jmrt.2025.09.157","url":null,"abstract":"<div><div>The formation of large, harmful rare earth (RE) inclusions in RE-containing steels is closely related to their agglomeration behavior, which is strongly influenced by the interfacial properties between inclusions and molten steel. To reveal the agglomeration characteristic and mechanism of RE-aluminate inclusions, this study first prepared the LaAlO₃ substrate and the steel sample containing only such inclusions. Based on that, the interfacial properties including that contact angle between inclusions and melt, surface tension of melt and interfacial energy between inclusions and melt were measured using the sessile drop method. Moreover, the agglomeration behavior of these inclusions was observed in situ by confocal laser scanning microscopy (CLSM). Thereafter, the theoretical models of agglomeration forces were used to quantitative analysis the agglomeration behavior of inclusions. The results show that LaAlO₃ inclusions are easier to agglomerate and form large-sized clusters. Compared with capillary force, cavity bridge force is the more important reason for inclusions agglomeration once the distance between them is close enough, and the contact angle between inclusions and molten steel plays a dominant role on affecting inclusions agglomeration. Similar to Al₂O₃, the strong agglomeration tendency of LaAlO₃ is attributed to their poor wettability with molten steel. This study can provide theoretical support for controlling RE-inclusions to improve the problems of nozzle clogging and product defects in RE-containing steels.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1213-1221"},"PeriodicalIF":6.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159787","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":"Friction and wear behaviors of MoAlB-0.1Si ceramic composite with superior comprehensive properties from RT to 800 °C","authors":"Yongxin Jian ,&nbsp;Aidar Murtazin ,&nbsp;Hao Yang ,&nbsp;Zhihan Chen ,&nbsp;Zhifu Huang","doi":"10.1016/j.jmrt.2025.09.143","DOIUrl":"10.1016/j.jmrt.2025.09.143","url":null,"abstract":"<div><div>MoAlB-0.1Si ceramic composite (Si0.1) has been prepared by hot-pressing sintering method. The microstructure, mechanical properties as well as tribological properties from room temperature(RT) to 800 °C have been systematically investigated with the aid of SEM, EDS, XRD and XPS. The results show that Si0.1 has much better wear resistance than MoAlB without Si addition(Si0) when sliding against IN718 and Si₃N₄ counterparts at all temperatures. With the temperature increasing from RT to 800 °C, the coefficient of friction (COF) and wear rate gradually decreases; and the wear rate of Si0.1 decrease by 92.9 % and 82.8 %, respectively. In case of IN718 counterpart, smooth tribo-layers can be formed on the wear surface; the main wear mechanism transforms from surface fracture at RT to oxidation wear at high temperature. Consequently, the lowest COF of 0.34 and wear rate of 3.504 × 10⁻⁶ mm³ (N m)⁻¹ can be obtained when wear against IN718 at 800 °C. In case of Si₃N₄, tribo-layers are hardly formed on the wear surface; the main wear mechanism transform from abrasive wear and surface fracture at RT to oxidation wear at high temperature. The higher hardness, fracture toughness as well as better oxidation resistance contribute to the superior tribological performance of Si0.1.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1091-1109"},"PeriodicalIF":6.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120920","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 secondary phases on electrical conductivity and thermal conductivity of HPDC Al-Ni and Al-Fe alloys: A comparative study","authors":"Hongbin Xing ,&nbsp;Fanjin Yao ,&nbsp;Qianxi Zhang ,&nbsp;Bo Hu ,&nbsp;Minke Qian ,&nbsp;Jun Jiang ,&nbsp;Bensong Chen ,&nbsp;Wanzhang Yang ,&nbsp;Dejiang Li ,&nbsp;Xiaoqin Zeng","doi":"10.1016/j.jmrt.2025.09.178","DOIUrl":"10.1016/j.jmrt.2025.09.178","url":null,"abstract":"<div><div>Solute atoms and secondary phases are the principal determinants of the electrical and thermal conductivity of aluminum (Al) alloys. However, the influence of secondary phases has often been undervalued compared to that of solute atoms. Herein, Al-Ni and Al-Fe alloys with gradient alloying contents were fabricated via high-pressure die casting (HPDC) to comparatively scrutinize the influence of the microscopic secondary phases on the macroscopic electrical and thermal conductivity of Al alloys. The results demonstrated that the microscopic conductive properties, morphology, and volume fraction of the secondary phases were the predominant factors influencing the electrical and thermal conductivity of Al alloys. Correspondingly, Al-Ni alloys demonstrated improved electrical and thermal conductivity, primarily due to the favorable microscopic electrical and thermal conductivity of their secondary phases, the elimination of morphology-induced electron scattering from needle-like secondary phases, and their comparatively lower secondary phase volume fractions. This research deepens the understanding of the microscopic secondary phase on macroscopic electrical conductivity and thermal conductivity of Al alloys, thereby contributing to the development of advanced Al alloys with enhanced conductive properties.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1280-1289"},"PeriodicalIF":6.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160273","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 Mg content on the anodization behavior and optical properties of 5xxx aluminum alloys","authors":"Xingxu Jiang ,&nbsp;Ruiyin Huang ,&nbsp;Chong Gao ,&nbsp;Ke Ma ,&nbsp;Xinghui Gui ,&nbsp;Shipeng Lin ,&nbsp;Zhenshan Liu ,&nbsp;Yue Ma","doi":"10.1016/j.jmrt.2025.09.154","DOIUrl":"10.1016/j.jmrt.2025.09.154","url":null,"abstract":"<div><div>Magnesium (Mg), as a principal alloying element in 5xxx series aluminum alloys, significantly influences the growth kinetics and microstructure of anodic oxide films, which in turn affects their optical properties. However, a systematic understanding of the underlying mechanisms remains limited. In this study, six aluminum alloys with Mg contents ranging from 0.00 to 6.00 wt% were systematically investigated to assess the influence of Mg on microstructural evolution, anodic film characteristics, and optical performance. The results revealed that increasing Mg content leads to pronounced grain refinement, with average grain size decreasing from 542 μm to 145 μm. During anodization, the presence of Mg accelerates oxide film growth, increasing film thickness from 11 μm to approximately 27 μm, and induces significant changes in the film's microstructure. Higher Mg levels result in significantly larger pore diameters and porosity, as well as increased interface roughness between the oxide film and substrate. These changes lead to reduced reflectance, particularly in the short-wavelength region (400–550 nm), due to enhanced wavelength-selective light scattering. As Mg content rises, gloss values of the anodized films decrease markedly from 1601 GU to 44.8 GU. Concurrently, CIE-Lab chromaticity measurements reveal that brightness (L∗) diminishes with Mg addition, while hue shifts toward a more neutral and slightly yellow tone. This study clarifies the structural–optical coupling mechanism driven by Mg addition and provides theoretical insight for alloy composition design and surface treatment optimization of aluminum alloys.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108901","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":"Time-sharing dual electron beam welding of TC4/T2 Joints: Enhanced mechanical properties due to the optimization of Intermetallics Compounds layer achieved by in-situ remelting","authors":"Siyi Li ,&nbsp;Shun Guo ,&nbsp;Yong Peng ,&nbsp;Jie Zhou ,&nbsp;Jieren Gu ,&nbsp;Qi Zhou ,&nbsp;Liang Wang ,&nbsp;Xigang Fan ,&nbsp;Kehong Wang","doi":"10.1016/j.jmrt.2025.09.102","DOIUrl":"10.1016/j.jmrt.2025.09.102","url":null,"abstract":"<div><div>Time-sharing Dual Electron Beam (TDEB) welding technology was used to process TC4/T2 joint. The key innovation of TDEB lies in its in-situ remelting capability, where a precisely controlled secondary electron beam dynamically remelts the weld pool. This unique feature enables active intervention in the solidification process, effectively breaking up the IMC layer. The in-situ remelting effect of TDEB achieved exceptional control over the detrimental IMCs layer: the thickness of the IMCs layer of the TC4/T2 joint is uneven with the thinnest area is less than 6 μm, and the average thickness is about 10 μm. The TC4/T2 joints exhibited remarkably enhanced mechanical properties, with a tensile strength of more than 240 MPa and a maximum elongation of 26.8 %. The fracture occurred in the heat-affected zone on the copper side. bypassing the typically brittle IMCs/TC4 interface, which indicates the effectiveness of TDEB in suppressing the IMCs layer's detrimental influence. Furthermore, microstructure analysis revealed that the IMCs layer consisted of a unique mixed structure of brittle CuTi and ductile Cu₃Ti. These ductile Cu₃Ti play a vital role in impeding crack initiation and propagation.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 920-932"},"PeriodicalIF":6.6,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120962","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":"Effects of different microstructures of near-α titanium alloys on interfacial voids evolution and bonding mechanisms produced by hot compression bonding","authors":"Haiyang Jiang ,&nbsp;Shaofei Ren ,&nbsp;Bijun Xie ,&nbsp;Yifeng Guo ,&nbsp;Yaojun Miao ,&nbsp;Bin Xu ,&nbsp;Mingyue Sun","doi":"10.1016/j.jmrt.2025.09.139","DOIUrl":"10.1016/j.jmrt.2025.09.139","url":null,"abstract":"<div><div>In this study, we investigated interfacial void healing, dynamic recrystallization, and the mechanical characteristics of the near-α titanium alloys bonding joints by hot compression bonding with different microstructures. The evolution of microstructure at bonding interfaces was investigated using SEM, EBSD and TEM. Molecular dynamics simulations were used to investigate evolution of interfacial voids. As for the bonding interface of equiaxed to equiaxed microstructure (E-E interface), most interfacial voids are found at the <em>α</em>-<em>α</em> interface, with fewer at the <em>β</em>-<em>β</em> interface. While for the bonding interface of Widmanstätten to Widmanstätten microstructure (W–W interface), interfacial voids are randomly distributed, notably with the <em>β</em> phase growing into these interfacial voids. This observation suggests a higher healing propensity of the <em>β</em> phase during bonding, which is due to that the diffusion rate of the body-centered cubic (BCC) <em>β</em> phase is 1.5 times higher than that of the hexagonal closed-packed (HCP) <em>α</em> phase, as verified by molecular dynamics simulations. Moreover, the characteristics of interfacial dynamic recrystallization indicate that continuous dynamic recrystallization characterized by progressive sub-grain rotation occurs at both the E-E interface and the W–W interface, with subsequent rotational dynamic recrystallization further refining the interfacial dynamically recrystallized grains. However, the further growth of interfacial recrystallization grains in W–W interface is hindered by the lamellar of the Widmanstätten microstructure. Notably, the mechanical properties of the joints are found to be comparable to the base material, highlighting the effectiveness of HCB in maintaining the integrity and strength of near-α titanium alloys bonding joints.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 771-781"},"PeriodicalIF":6.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120964","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":"Enhanced high-temperature oxidation resistance of Ni-based single crystal superalloys by laser shock peening","authors":"Wangwang Ding ,&nbsp;Busheng Zhang ,&nbsp;Jiajun Wu ,&nbsp;Xiaodie Cao ,&nbsp;Yan Chen ,&nbsp;Haoran Gu ,&nbsp;Dongxing Zhang ,&nbsp;Qiuquan Guo ,&nbsp;Yong Sun ,&nbsp;Jun Yang","doi":"10.1016/j.jmrt.2025.09.145","DOIUrl":"10.1016/j.jmrt.2025.09.145","url":null,"abstract":"<div><div>The fourth generation of Ni-based single crystal superalloys (Ni-SXs), such as DD91, play a crucial role in aerospace and gas turbines due to their excellent performance at high temperature. To enhance the oxidation resistance and high-temperature performance of Ni-SXs, the laser shock peening (LSP) treatment was employed to introduce the dislocations in their surface, which act as diffusion channels for metal atoms and promote the formation of dense protective oxide layer during oxidation. In this study, XRD, XPS, SEM and TEM analyses were conducted on the cross-section of Ni-SXs to compare the microstructure and oxidation behavior before and after the LSP treatment. The results indicate that surface engineering via the LSP treatment significantly alters the dislocations status of γ/γ՛ phases, consequently influencing the surface oxide layer and oxidation resistance of Ni-SXs. Additionally, the oxidation mechanism of Ni-SXs after the LSP treatment was studied. The understanding developed in this work could be beneficial for the design of the alloys with enhanced oxidation resistance.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108902","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}