Materials Characterization最新文献

{"title":"Microstructural Evolution, Deformation Mechanisms and Texture Development in Friction Stir Welded Nickel and Molybdenum Free-High Nitrogen Austenitic Stainless Steel","authors":"Arun Kumar Gurrala,&nbsp;Raffi Mohammed","doi":"10.1016/j.matchar.2025.115129","DOIUrl":"10.1016/j.matchar.2025.115129","url":null,"abstract":"<div><div>This study presents a comprehensive analysis of the microstructural evolution, deformation mechanisms, and textural development in friction stir-welded (FSW) novel nickel- and molybdenum-free high nitrogen austenitic stainless steel (HNASS) through electron backscatter diffraction (EBSD) techniques. We delineate the distinct microstructural transformations occurring on the advancing side (AS) and retreating side (RS) within the stir zone (SZ), thermo-mechanically affected zone (TMAZ), and heat-affected zone (HAZ). The base metal (BM) is characterized by an equiaxed austenitic grain structure, enriched with a high density of high-angle grain boundaries (HAGBs) and coincidence site lattice (CSL) boundaries, reflective of its well-annealed state. The FSW process engendered significantly higher strain rates and thermal gradients on the AS relative to the RS, leading to refined grain structures and an intensified dynamic recrystallization (DRX) process. Notably, discontinuous dynamic recrystallization (DDRX) was identified as a predominant grain refinement mechanism, exerting a more substantial influence on the AS due to elevated strain and temperature conditions. In-depth analysis of grain boundary character distribution (GBCD), kernel average misorientation (KAM), grain orientation spread (GOS), and grain average misorientation (GAM) across the different weld zones revealed pronounced plastic deformation and internal strain on the AS. Furthermore, textural analysis uncovered key shear components in the SZ, imparting distinct microstructural and textural attributes. This investigation sheds light on the intricate interactions between deformation, recrystallization, shear, and thermal effects during FSW, offering new insights into the mechanisms that enhance the mechanical properties and corrosion resistance of welded joints in nickel and molybdenum-free HNASS. The findings provide a critical foundation for optimizing FSW parameters to achieve superior material performance.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115129"},"PeriodicalIF":4.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916536","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":"Chemistry effects on ODS steel consolidated via laser powder bed fusion from GARS powder","authors":"Matthew deJong ,&nbsp;Sourabh Saptarshi ,&nbsp;Iver Anderson ,&nbsp;Jordan Tiarks ,&nbsp;Chad Parish ,&nbsp;Megan Carter ,&nbsp;David Armstrong ,&nbsp;Christopher Rock ,&nbsp;Timothy Horn ,&nbsp;Djamel Kaoumi","doi":"10.1016/j.matchar.2025.115141","DOIUrl":"10.1016/j.matchar.2025.115141","url":null,"abstract":"<div><div>Oxide Dispersion Strengthened (ODS) steels are promising candidate alloys for structural and cladding applications in extreme environments. They contain a high density of nanoscale oxides for high temperature mechanical strength and radiation resistance. In this work, gas atomization reaction synthesis (GARS) was used to produce powders that were used for additive manufacturing (AM) Laser Powder Bed Fusion consolidation of ODS steels, in order to skip the traditional mechanical alloying of blended yttria and alloy powders. Powder containing iron, chromium, and tungsten with varying amounts of yttrium, titanium, oxygen and zirconium were used to produce ODS steel samples. AM consolidated specimens and powder samples were characterized with transmission electron microscopy. TEM imaging, diffraction patterns, and energy dispersive X-ray spectroscopy (EDS) was used to identify phases present before and after consolidation across chemistries. The effect of the controlled oxygen input (from GARS) and the oxide-forming additions (Y, Ti, Zr) on precipitate size distribution and composition is substantiated and discussed.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115141"},"PeriodicalIF":4.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929555","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":"Understanding improved high temperature strength of Mo-Si-B alloy at 1100–1300 °C based on ZrB2 addition","authors":"Juan Wang,&nbsp;Wenhao Wang,&nbsp;Bin Li,&nbsp;Rui Li,&nbsp;Caixia Wang,&nbsp;Jiachen Zhang,&nbsp;Tao Wang,&nbsp;Guojun Zhang","doi":"10.1016/j.matchar.2025.115126","DOIUrl":"10.1016/j.matchar.2025.115126","url":null,"abstract":"<div><div>In this study the influence of ZrB₂ addition on microstructure and high temperature compressive strength (1100 °C–1300 °C) of Mo-12Si-8.5B (at. %) alloy was investigated. Results showed that the high temperature strength was closely related to the ZrB₂ addition as well as the scale of the microstructure, and the smaller grain size of Mo-12Si-8.5B alloy resulted from ZrB₂ was beneficial to the improvement of the strength at 1100 °C but greatly deteriorated the strength at 1300 °C, which even counteracted the positive effect of Zr-rich particles derived from ZrB₂ addition. Clearly, under the premise of the same grain size, the addition of 1.5 wt% ZrB₂ significantly resulted in the improved yield strength and peak stress of the Mo-12Si-8.5B alloy within the temperature range of 1100 °C–1300 °C. Specially a remarkable increase of 30 % in yield strength was observed at 1200 °C, while at 1300 °C, the yield strength rose by 15 %. The excellent mechanical properties of the Mo-Si-B alloy with ZrB₂ addition could be attributed to a synergistic effect of intragranular Zr-rich particles dispersion strengthening, intergranular Zr-rich particles pinning effect and grain boundary purification. Additionally, these Zr-rich particles also hindered the dynamic recrystallization behavior and enhanced the softening resistance of the Mo-12Si-8.5B alloy.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115126"},"PeriodicalIF":4.8,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070986","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":"Microstructure and indentation of a (MoNbTaVW)C system processed by high energy ball milling followed by spark plasma sintering at 1800 °C","authors":"I.M. Das ,&nbsp;H. Kumar ,&nbsp;K.K. Behera ,&nbsp;S. Makineni ,&nbsp;S.R. Bakshi ,&nbsp;A. Mandal ,&nbsp;S. Gollapudi","doi":"10.1016/j.matchar.2025.115124","DOIUrl":"10.1016/j.matchar.2025.115124","url":null,"abstract":"<div><div>This work reports the development of a multi-phase (MoNbTaVW)C carbide processed using a combination of high energy ball milling and spark plasma sintering. The compact sintered at 1800 °C provided a relative density of 99.5 % and consisted of a FCC1, BCT and FCC2 phase. The microhardness and indentation fracture toughness of the sintered compact was observed to be 20.2 GPa and 4.9 MPa.m^1/2 respectively. Mechanisms of crack deflection and crack bridging were found to be operational in the sintered compact. The FCC1 phase was found to be harder and tougher than the BCT phase. Interestingly <em>P-h</em> curves from both FCC1 and BCT phases exhibited displacement excursions or <em>pop-ins</em> whose formation was attributed to nanoscale plasticity. The FCC1 phase demonstrated <em>pop-ins</em> of greater depth and in larger number than those observed in the BCT phase and this was attributed to its higher entropy of mixing at 1.7R vis-à-vis the BCT phase at 1.3R. The higher entropy in FCC1 phase can be correlated to higher lattice distortion which could be controlling the formation of the <em>pop-ins</em> in the material.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115124"},"PeriodicalIF":4.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916561","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":"Comprehensive enhancement of mechanical properties, wear resistance, and corrosion resistance in Al₀.₂₅FeCoNiVTiₓ high-entropy alloy through Ti alloying","authors":"Wenjuan Xing ,&nbsp;Zhonghan Yu ,&nbsp;Changyi Liu ,&nbsp;Junrong Li ,&nbsp;Zhijie Zhang ,&nbsp;Zhenqiao Zhang ,&nbsp;Hongwei Zhao","doi":"10.1016/j.matchar.2025.115118","DOIUrl":"10.1016/j.matchar.2025.115118","url":null,"abstract":"<div><div>The advancement of the aerospace and marine industries has increased the demand for materials with exceptional resistance to both abrasion and corrosion. High-entropy alloys (HEAs) hold significant potential for industrial applications due to their multi-component nature and tunable microstructures. This study systematically investigates the effects of Ti alloying on the microstructure, mechanical properties, wear resistance, and corrosion resistance of Al₀.₂₅FeCoNiVTiₓ HEAs (x = 0, 0.1, 0.3, 0.5, and 0.7). Increasing Ti content notably promotes the formation of the body-centered cubic phase, achieving synergistic enhancements in hardness, wear resistance, and corrosion resistance. The Al₀.₂₅FeCoNiVTi₀.₇ alloy demonstrates a remarkable 136 % increase in hardness, a 95.2 % reduction in wear rate, and a 67.4 % decrease in corrosion current density compared to the base alloy (Al₀.₂₅FeCoNiV), alongside a 164.1 % increase in polarization resistance. Comprehensive characterization using scanning electron microscope, electron backscatter diffraction, and X-ray photoelectron spectroscopy, combined with quantitative analyses of frictional heat generation, contact stress, and crack extension resistance, elucidates the underlying mechanisms. The transition from adhesive-abrasive wear to oxidative wear, coupled with enhanced material strength and resistance to wear damage, accounts for the superior wear performance. The improved corrosion resistance is primarily attributed to Ti alloying, which optimizes the passivation film's composition, significantly enhancing its densification, chemical stability, and corrosion resistance. This study provides a theoretical foundation for designing HEAs with exceptional hardness, wear resistance, and corrosion resistance.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115118"},"PeriodicalIF":4.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929033","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":"Crack mitigation in selective laser melting of CM247LC superalloy via post-heating laser tracks: Influence on microstructure and cracking behavior","authors":"Yandong Shi ,&nbsp;Aoqi Wu ,&nbsp;Siwei Li ,&nbsp;Lei Shi ,&nbsp;Liming Lei ,&nbsp;Liting Shi ,&nbsp;Wenkai Li ,&nbsp;Xuming Su","doi":"10.1016/j.matchar.2025.115117","DOIUrl":"10.1016/j.matchar.2025.115117","url":null,"abstract":"<div><div>The selective laser melting (SLM) process for fabricating CM247LC nickel-based superalloy components is often limited by severe cracking. This study explores the use of a post-heating laser track as a method to mitigate cracks during SLM processing by providing localized pre-heating. The effects of post-heating energy input on density, microhardness, cracking characteristics, microstructure, and cracking mechanisms were systematically analyzed. Results show that without post-heating, there was a weak correlation between volumetric energy density (VED) and material density, with densities ranging from 8.18 to 8.60 g/cm³ and peaking at 107.1 J/mm³. Microhardness remained largely unaffected by VED, but a weak positive correlation was observed when post-heating was applied. Cracking characteristics, including crack length and frequency, were significantly influenced by the post-heating energy input, with 80 % energy input yielding the best results in reducing crack lengths. Furthermore, the post-heating process induced grain refinement, increasing grain equiaxity and altering the dominant cracking mechanism from intergranular to ductility dip cracking at lower energy inputs. Although cracks were not entirely eliminated, reducing crack lengths typically offers promising improvements for the fatigue performance of the material. This study highlights the potential of post-heating laser tracks as a practical solution for crack mitigation in SLM-fabricated CM247LC components.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115117"},"PeriodicalIF":4.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911990","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":"Strong and ductile metastable β titanium alloy via laser powder bed fusion through nitrogen interstitials and tailored microstructure","authors":"Yiming Peng ,&nbsp;Chaoyue Chen ,&nbsp;Ruixin Zhao ,&nbsp;Yuyang Hou ,&nbsp;Xia Li ,&nbsp;Lin Lu ,&nbsp;Ammarueda Issariyapat ,&nbsp;Xi Du ,&nbsp;Liming Lei ,&nbsp;Jiang Wang ,&nbsp;Zhongming Ren","doi":"10.1016/j.matchar.2025.115121","DOIUrl":"10.1016/j.matchar.2025.115121","url":null,"abstract":"<div><div>Owing to the excellent mechanical properties, the laser powder bed fusion (L-PBF) of metastable β-type Ti-10 V-2Fe-3Al (Ti1023) alloys has attracted increasing attention. In this study, an Ar and 10 vol% N₂ reactive atmosphere was employed to tailor the microstructure and achieve solid solution strengthening via interstitial nitrogen atoms, thereby significantly enhancing the mechanical properties of metastable β‑titanium alloys. Interstitial nitrogen atoms in the titanium matrix induce lattice distortion, as determined by XRD (X-ray diffraction), whereas the nitrogen content can reach ∼1900 ppm (parts per million). Under an Ar-10 vol% N₂ reactive atmosphere, various scanning speeds can notably promote the columnar to equiaxed transition (CET) and grain size refinement in Ti1023 alloys. Transmission electron microscopy (TEM) reveals extensive nucleation and growth of nanoscale, dot-like α phases, which correlates with the increased T_β temperature and more intense thermal cycling induced by interstitial nitrogen atoms. Mechanical testing shows that, the increasing scanning speed under a pure Ar atmosphere reduces yield strength from 935.5 ± 33.2 MPa to 903.0 ± 13.0 MPa and increases elongation from 6.4 ± 3.1 % to 13.8 ± 1.5 %. Conversely, under a 10 vol% N₂ atmosphere, yield strength decreases from 1053.0 ± 18.0 MPa to 986.3 ± 7.6 MPa and ductility increases from 5.8 ± 1.1 % to 10.1 ± 1.7 %. Interstitial nitrogen atoms contribute ∼100 MPa to the yield strength. Nanoscale ω and α phases suppress the TRIP (transformation-induced plasticity) effect, thereby preventing the emergence of low yield strength. The promotion of fine equiaxed grain formation preserved the alloy's ductility. This balance results in an optimal combination of strength and ductility. In summary, this study presents a pathway to tailor the microstructure and enhance the mechanical properties of metastable β‑titanium alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115121"},"PeriodicalIF":4.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929556","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 thermal stability, phase precipitation and tribological behavior of AlCoCrFeNb0.4Ni2.1 multiphase high entropy alloy under heat treatment","authors":"Yinghui Dong ,&nbsp;Zhaobing Cai ,&nbsp;Juanjuan Hu ,&nbsp;Chongmei Wang ,&nbsp;Sikai Mei ,&nbsp;Le Gu","doi":"10.1016/j.matchar.2025.115120","DOIUrl":"10.1016/j.matchar.2025.115120","url":null,"abstract":"<div><div>For AlCoCrFeNb_0.4Ni_2.1 high entropy alloy samples subjected to vacuum heat treatment, the effects of temperature on microstructure and tribological performance were investigated. The results indicate that the samples exhibit considerable thermal stability, the phase structure does not change before and after heat treatment, and is composed of the FCC phase, the BCC phase, and the (Ni, Cr, Co, Fe)₂Nb-type Laves phase. The heat treatment accelerates the precipitation of the FCC phase within the BCC phase, with the precipitation rate increasing as the temperature rises. When the temperature reaches 800 °C, the Laves phase begins to precipitate in the BCC phases. After 700 °C-2 h heat treatment, the AlCoCrFeNb_0.4Ni_2.1 HEA samples attain the highest microhardness and the best wear resistance. As the heat treatment temperature increases, the wear mechanism is gradually dominated by oxidative wear and adhesive wear. In summary, the multiphase HEA prepared by appropriate ratio and process has reliable microhardness and wear resistance, and after 700 °C-2 h heat treatment, the content of each phase reaches the best ratio, making HEA not only have strong wear resistance, but also reduce the friction coefficient, which provides a design idea for the subsequent design of strengthening and toughening metal.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115120"},"PeriodicalIF":4.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928204","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 homogenization annealing on microstructure and mechanical properties of AlMo0.5NbTa0.5TiZr refractory high entropy alloy manufactured by laser metal deposition","authors":"Yunze Li,&nbsp;Junhui Xie,&nbsp;Zhiheng Zhang,&nbsp;Xinzhou Zhang,&nbsp;Xudong Ren,&nbsp;Lan Chen","doi":"10.1016/j.matchar.2025.115119","DOIUrl":"10.1016/j.matchar.2025.115119","url":null,"abstract":"<div><div>The AlMo_0.5NbTa_0.5TiZr refractory high-entropy alloy (RHEA) has garnered significant attention for its excellent high-temperature properties and low density, indicating substantial potential in aerospace applications. Laser powder deposition (LMD) is an ideal method for fabricating RHEAs due to its rapid cooling and minimal secondary processing. The effects of homogenization annealing on the microstructure and mechanical properties of AlMo_0.5NbTa_0.5TiZr RHEAs fabricated by LMD are reported for the first time. The LMD alloy consists of columnar dendrites, with dendritic regions enriched in Mo, Nb, and Ta, and interdendritic regions enriched in Al, Zr, and Ti. Additionally, an Al<img>Zr HCP phase is observed. After annealing at 900 °C and 1100 °C, the dendritic structure persists. Zr first precipitates in the interdendritic regions, combining with Al to form the Al<img>Zr HCP phase. At 1300 °C for 10 h, complete homogenization is achieved, forming a nano-scale basket-weave structure within the equiaxed grains, and reaching the maximum yield strength of 2289 MPa. As the annealing time increases, the basket-weave structure coarsens, resulting in a decrease in microhardness (from 640 HV to 603 HV) and compressive strain (from 11.92 % to 10.48 %). The non-sluggish diffusion behavior of Zr in AlMo_0.5NbTa_0.5TiZr RHEAs primarily drives the microstructural evolution and the formation of multiphase structures. This study adjusts the morphology of the precipitates through heat treatment to achieve excellent mechanical properties, providing a reference for the development of heat treatment regimes.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115119"},"PeriodicalIF":4.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916550","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":"Dynamic strain aging at the room temperature of near-α MgLi alloy: A study of dislocation substructures","authors":"Qiuyu Chen ,&nbsp;Fei Guo ,&nbsp;Luyao Jiang ,&nbsp;Yanlong Ma ,&nbsp;Minyu Ma ,&nbsp;Zhongwei Wang ,&nbsp;Qiqi Li ,&nbsp;Xiangsheng Xia ,&nbsp;Haiding Liu ,&nbsp;Dingfei Zhang","doi":"10.1016/j.matchar.2025.115125","DOIUrl":"10.1016/j.matchar.2025.115125","url":null,"abstract":"<div><div>As-casted Mg-5.5 Li-0.5 Y alloy was tension at different strain rates. A serrated flow with several remarkable drops was only observed when samples deformed at 10⁻⁴ s⁻¹. The sudden drop of flow stress mainly existed in the strain lower than 0.03, and the plastic instability disappeared at the larger strain. The strain rate jump test proved that the alloy exhibited a negative strain rate sensitivity at 10⁻⁴ s⁻¹, which is a sign of dynamic strain aging (DSA). The difference in flow behavior indicates the deformation behavior of Mg<img>Li alloys largely depends on strain rate. The dislocation configuration in the samples deformed at different strain rates is different. The dislocation density of the DSA sample is relatively low and most of the dislocations were basal &lt;a &gt; slip. DSA promoted jog climb of dislocation and the climb induced the dislocation transferred to another basal plane and further glide, which forms a series of dislocation bows and dipoles. Besides the job climb, the formation of stacking faults is another characteristic of the sample deformed at 10⁻⁴ s⁻¹. The solute atoms are segregated at the stacking faults, which shows a strong pinning effect on dislocation movability. Inhabitation of the glide induced a high strength and work hardening rate when the sample tension was at 10⁻⁴ s⁻¹.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"225 ","pages":"Article 115125"},"PeriodicalIF":4.8,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916534","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}