Materials Characterization最新文献

Multi-scale fatigue crack growth behaviors within band mixed-grain structure in AlLi alloy

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-04-14 DOI: 10.1016/j.matchar.2025.115011

Zhi-min Cai , Guang-jun Zeng , Hui Xiang , Chen-chen Xiong , Han-yuan Sun , Hao-ran Li , San-xi Deng , Hua Zhou , Yong Yao , Dan-yang Liu , Jin-feng Li

{"title":"Multi-scale fatigue crack growth behaviors within band mixed-grain structure in AlLi alloy","authors":"Zhi-min Cai , Guang-jun Zeng , Hui Xiang , Chen-chen Xiong , Han-yuan Sun , Hao-ran Li , San-xi Deng , Hua Zhou , Yong Yao , Dan-yang Liu , Jin-feng Li","doi":"10.1016/j.matchar.2025.115011","DOIUrl":"10.1016/j.matchar.2025.115011","url":null,"abstract":"<div><div>The effect of band mixed-grain structure controlled by annealing treatment before solid solution on fatigue crack growth (FCG) properties in T8 aged 2A97 Al<img>Li alloy sheets was investigated systematically. The lamellar boundaries (LBs) and residual secondary phase particles inhibited the growth of recrystallized grains along normal direction. It ultimately resulted in a pronounced band mixed-grain structure. Annealing treatment significantly increased the fraction of sub-grains and the lower annealing temperature suppressed sub-grains coarsening. Fatigue cracks growing parallel to the sub-grain bands suffered great resistance leading to a significant reduction in FCG rate. At lower stress intensity factor range (ΔK), changes in stress field at the crack tip significantly diverted fatigue crack propagation direction, resulting in a millimeter-scale bending area in fatigue crack path. Moreover, the bending degree of fatigue crack is closely related with sub-grain size. Microscopic fatigue cracks grew mainly along the grain orientation boundaries (GOBs) caused by insufficient recrystallization. Its deflections and bifurcations were affected by the secondary phase particles and Schmid factor (SF). Large-sized brittle secondary phase particles tended to damage the fatigue properties of the matrix, while fine dispersoids reduced FCG rate. Bifurcations occurred when fatigue crack propagated in the R-cube orientated sub-grain regions with higher SF</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115011"},"PeriodicalIF":4.8,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826245","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

Crystallographic texture variation in laser beam-welded CoCrFeNiMn

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-04-11 DOI: 10.1016/j.matchar.2025.115030

Nowfal Al-Hamdany , Volker Ventzke , Falk Dorn , Emad Maawad , Norbert Schell , Nikolai Kashaev

{"title":"Crystallographic texture variation in laser beam-welded CoCrFeNiMn","authors":"Nowfal Al-Hamdany , Volker Ventzke , Falk Dorn , Emad Maawad , Norbert Schell , Nikolai Kashaev","doi":"10.1016/j.matchar.2025.115030","DOIUrl":"10.1016/j.matchar.2025.115030","url":null,"abstract":"<div><div>This study examines the crystallographic texture and residual stress variation of a laser-welded CoCrFeNiMn high-entropy alloy (HEA) plate. The HEA plate was welded using a disc laser with a maximum power output of 4 kW, which was also equipped with a bright line weld module and a dual-core fiber with a diameter of 100 and 400 μm, respectively. The welding direction was aligned with the rolling direction. The texture was investigated via high-energy X-ray beam and EBSD. To investigate the crystallographic variation in the welded CoCrFeNiMn HEA plate, the textures were examined in the fusion zone (FZ), the heat affected zone (HAZ), and the base material (BM). The texture observed in the FZ was a combination of the textures present on ±0.1 mm positions from the weld centerline. The texture identified on each side of the centerline of the FZ comprises fibers oriented 〈100〉 // to the transverse direction, exhibiting a ± 10° rotation around the rolling direction. The texture observed in the BM exhibits a rolling-type texture, represented by {110}<112> brass, {112}<111> Cu, and {123}<643> S components, with a dominant {110}<112> brass component and a sharpness of 4.8 mrd. The microhardness profiles indicate a slight decline in hardness, from 260 HV0.1 for the BM to 240 HV0.1 in the FZ. The mechanical properties of the welded samples exhibited a slight reduction in ultimate tensile strength (from 900 ± 15 MPa to 830 ± 10 MPa) and elongation (from 18 ± 3 % to 13 ± 3 %). This decrease in mechanical properties could be attributed to the presence of large grains in the FZ, the dissolution of precipitation, and alterations in texture. This alloy displays excellent weldability, making it a promising candidate for engineering applications.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115030"},"PeriodicalIF":4.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828274","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

Design and characterization of novel multi-phase AlMgZnCuSi light-weight high-entropy alloy with high potential as PCM for energy storage applications

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-04-11 DOI: 10.1016/j.matchar.2025.115027

Godson Nyaforkpa, Mohamed A.H. Gepreel

{"title":"Design and characterization of novel multi-phase AlMgZnCuSi light-weight high-entropy alloy with high potential as PCM for energy storage applications","authors":"Godson Nyaforkpa, Mohamed A.H. Gepreel","doi":"10.1016/j.matchar.2025.115027","DOIUrl":"10.1016/j.matchar.2025.115027","url":null,"abstract":"<div><div>This paper presents the design, synthesis, and characterization of a lightweight and cost-effective multi-phase eutectic high-entropy alloy, <span><math><msub><mi>Al</mi><mn>35</mn></msub><msub><mi>Mg</mi><mn>30</mn></msub><msub><mi>Zn</mi><mn>15</mn></msub><msub><mi>Cu</mi><mn>10</mn></msub><msub><mi>Si</mi><mn>10</mn></msub></math></span>(at.%) with a density of 3.30 g/cm<sup>3</sup>. The chemical composition of the alloy was meticulously selected to have a mixture of eutectic and intermetallic phases. The alloy is produced by melting followed by a semisolid forging process conducted at 510 °C, employing various holding times to investigate the behavior and phase transformations associated with this alloy. The alloy showed four major phases: FCC (<span><math><mi>α</mi></math></span>-Al) solid solution, Al<sub>2</sub>Cu, Mg<sub>2</sub>Si intermetallic, and FCC Mg-Al-Zn compounds. The semisolid forging process demonstrated remarkable plasticity through reducing the sample thickness by 35% and 70%. The alloy exhibited a high latent heat capacity of phase change, reaching up to 168.9 kJ/kg at around 450<span><math><mo>°</mo><mi>C</mi></math></span>, where partial melting of the eutectic phase occurs. This value ranks this alloy among the highest values reported for high-temperature metallic phase change materials. The novel alloy by its nature also boasts partial melting at high temperatures, eliminating the need for costly heat transfer enhancement techniques required by other PCMs. The oxidation kinetics showed an increasing pattern of weight change, adhering to a parabolic rate law. The semisolid forged sample, which was 70% oxidized, displayed the lowest parabolic rate constant of 0.233 × 10<sup>−2</sup> g/cm<sup>2</sup> after 500 min indicating a low oxidation rate, thus having good oxidation resistance.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115027"},"PeriodicalIF":4.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828275","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

Revealing the formation mechanisms of twinned substructure in low-carbon martensitic steel through multiscale characterization

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-04-11 DOI: 10.1016/j.matchar.2025.115029

Jianhui Yan , Peng Xue , Wei Li , Li You , Xiaodong Zhu , Laiqi Zhang

{"title":"Revealing the formation mechanisms of twinned substructure in low-carbon martensitic steel through multiscale characterization","authors":"Jianhui Yan , Peng Xue , Wei Li , Li You , Xiaodong Zhu , Laiqi Zhang","doi":"10.1016/j.matchar.2025.115029","DOIUrl":"10.1016/j.matchar.2025.115029","url":null,"abstract":"<div><div>The formation mechanisms of twinned substructure in low-carbon martensitic steel were systematically investigated through a synergistic analysis of spatial distribution, atomic arrangement, localized strain, and elemental segregation. The findings show that heterogeneous carbon distribution creates favorable conditions for twinning deformation. Twinned substructure preferentially nucleates in carbon-enriched depressed areas, demonstrating substantial spatial heterogeneity in both individual dimension and population distribution. In this substructure, irregular area disrupts the regular crystallographic arrangement between the matrix and twin. The width of this area varies from atomic scale (at twin boundary) to nanometer scale (within matrix/twin interior), depending on the matrix/twin dimensions. The irregular area has a hexagonal configuration and maintain a coherent relationship with the adjacent matrix/twin phase. This structural characteristic enhances carbon diffusivity, accommodates localized strain, and reduces transformation resistance, which together promote the formation of twinned substructure. Carbon concentration disparities critically regulate twin morphology and microscopic configuration. As the carbon content increases, the width of the irregular area decreases, and its preferential location shifts from matrix/twin interior to twin boundary. The identified mechanisms exhibit strong generalizability across carbon concentrations and are expected to establish a unified mechanistic framework for the formation of twinned substructure across the full carbon content spectrum.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115029"},"PeriodicalIF":4.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820602","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

Synergistic enhancement of high-temperature oxidation resistance in lightweight AlFeCrMnTi high-entropy alloy via BCC phase and L21 nano-coherent precipitates

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-04-10 DOI: 10.1016/j.matchar.2025.115033

Lipeng Shao , Xuecheng Jin , Hao Li , Wei Zhang , Jiayi Xu , Wei Wei , Jing Hu , Wenfeng Yang , Wenwen Sun , Xulong An

{"title":"Synergistic enhancement of high-temperature oxidation resistance in lightweight AlFeCrMnTi high-entropy alloy via BCC phase and L21 nano-coherent precipitates","authors":"Lipeng Shao , Xuecheng Jin , Hao Li , Wei Zhang , Jiayi Xu , Wei Wei , Jing Hu , Wenfeng Yang , Wenwen Sun , Xulong An","doi":"10.1016/j.matchar.2025.115033","DOIUrl":"10.1016/j.matchar.2025.115033","url":null,"abstract":"<div><div>This study investigates the high-temperature oxidation behavior of a lightweight, non-equiatomic AlFeCrMnTi high-entropy alloy (LWHEA) with a density of 6.29 g/cm<sup>3</sup>. The alloy exhibits a dual-phase microstructure consisting of a Cr- and Mn-rich BCC matrix and L2₁(Fe<sub>2</sub>AlTi) nano-precipitates. High-temperature cyclic oxidation tests at 700 °C, 800 °C, and 900 °C reveal superior oxidation resistance, with parabolic rate constants of 2.10 × 10<sup>−8</sup> mg<sup>2</sup>·cm<sup>−4</sup>·s<sup>−1</sup> and 1.02 × 10<sup>−7</sup> cm<sup>−4</sup>·cm cm<sup>−4</sup>·s<sup>−1</sup> at 700 °C and 800 °C, respectively. At 900 °C, the oxidation rate increases due to the formation of MnO<sub>2</sub> impurities, which compromise the protective Al<sub>2</sub>O<sub>3</sub> oxide layer. The exceptional oxidation resistance at lower temperatures is attributed to the synergistic interaction between the BCC phase and L2₁ precipitates, which promote the formation of a dense and continuous Al<sub>2</sub>O<sub>3</sub> film. This work provides a comprehensive model for enhancing oxidation resistance in lightweight high-entropy alloys through microstructure optimization, offering significant economic and performance benefits for high-temperature applications.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115033"},"PeriodicalIF":4.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820599","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

Microstructure and mechanical properties of CoCrFeNiMn HEA/1060Al magnetic pulse welded joints

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-04-09 DOI: 10.1016/j.matchar.2025.115021

Jiahao Deng , Jilin Xie , Jishuai Li , Yuhan Zhou , Shanlin Wang , Timing Zhang , Yuhua Chen

{"title":"Microstructure and mechanical properties of CoCrFeNiMn HEA/1060Al magnetic pulse welded joints","authors":"Jiahao Deng , Jilin Xie , Jishuai Li , Yuhan Zhou , Shanlin Wang , Timing Zhang , Yuhua Chen","doi":"10.1016/j.matchar.2025.115021","DOIUrl":"10.1016/j.matchar.2025.115021","url":null,"abstract":"<div><div>CoCrFeNiMn high entropy alloy and 1060 Al can achieve high quality welded joints using magnetic pulse welding. The mechanical properties and microstructure observation were used to evaluate the joint properties and the dynamic deformation mechanism of welded joint. The findings of the quasi-static tensile test indicate that as the discharge energy increases, the fracture of the joint is keeping at 1060 Al, and the fracture form of the joint undergoes a transformation, shifting from a ductile fracture to a ductile-brittle mixed fracture. The higher the discharge energy is, the interface transition layer and mechanical interlocking become more pronounced, exhibiting distinctive interface characteristics such as “wavy” and “inverted hook-like” patterns. The transition layer of the welded joint is primarily constituted of amorphous phases comprising Al, Co, Cr, Fe, Ni and Mn, along with substantial granular AlxCoCrFeNiMn high entropy alloy. The primary bonding mechanisms of CoCrFeNiMn high entropy alloy/1060 Al welded joints are local melting and rapid solidification. The dynamic deformation mechanism of the CoCrFeNiMn high entropy alloy matrix under an extremely high strain rate (10<sup>6</sup>–10<sup>7</sup> s<sup>−1</sup>) of electromagnetic pulse shock is dominated by dislocation motion, rather than the more commonly observed twins and adiabatic shear bands.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115021"},"PeriodicalIF":4.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826243","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

Simultaneously improving strength and ductility of cast Mg-Gd-Zn alloy through Er addition

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-04-09 DOI: 10.1016/j.matchar.2025.115020

Jinming Lin, Penghuai Fu, Yiwen Ding, Ziyan Li, Hong Liu, Yingxin Wang, Liming Peng, Wenjiang Ding

{"title":"Simultaneously improving strength and ductility of cast Mg-Gd-Zn alloy through Er addition","authors":"Jinming Lin, Penghuai Fu, Yiwen Ding, Ziyan Li, Hong Liu, Yingxin Wang, Liming Peng, Wenjiang Ding","doi":"10.1016/j.matchar.2025.115020","DOIUrl":"10.1016/j.matchar.2025.115020","url":null,"abstract":"<div><div>Precipitation strengthening typically enhances strength at the expense of ductility, giving rise to the strength-ductility trade-off in magnesium-rare earth (Mg-RE) alloys. Erbium (Er), which exhibits relatively high solid solubility in Mg, offers great potential for strengthening and toughening Mg alloys. This study systematically investigates the influence of Er addition on the microstructure, mechanical properties, strengthening and toughening mechanisms of Mg-10Gd-<em>x</em>Er-0.2Zn-0.4Zr (<em>x</em> = 0, 1, 2, 4) (wt.%) alloys. The addition of Er causes a transformation of the eutectic phase from Mg<sub>5</sub>Gd to Mg<sub>3</sub>(Gd, Er) in the as-cast alloys, accompanied by an increase in the content of unexpected rare earth hydrides. Following appropriate heat treatment, a substantial amount of Er dissolves into the Mg matrix, resulting in pronounced solid solution strengthening. Additionally, a portion of Er participates in the precipitation process, significantly increasing the number densities and sizes of the β’ and β<sub>1</sub> phases. Slip trace analysis indicates that Er addition remarkably promotes the activation of non-basal slip, thereby enhancing homogeneous plastic deformation capability and contributing to improved ductility. First-principles calculations further confirm a substantial reduction in generalized stacking fault energy (GSFE) upon Er addition. The novel-developed Er-containing alloys demonstrate an excellent strength-ductility synergy, with the peak-aged alloy containing 2 wt.% Er showing superior room temperature mechanical properties: 257 MPa yield strength, 382 MPa ultimate tensile strength, and 8.2% elongation. This research provides important scientific insights into evading the strength-ductility trade-off in Mg alloys, which is critical for their broader application.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115020"},"PeriodicalIF":4.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826244","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

One-step direct laser-induced Mo3C2/rGO composite for hydrogen evolution reaction

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-04-09 DOI: 10.1016/j.matchar.2025.115031

Yuanyuan Huang , Changlin Yang , Heping Xie , Mingfu Xiao , Xiaoqi Zhou , Yi Tian , Juntao Zhu , Shouyong Xie , Zirong Tang , Yiying Zhu

{"title":"One-step direct laser-induced Mo3C2/rGO composite for hydrogen evolution reaction","authors":"Yuanyuan Huang , Changlin Yang , Heping Xie , Mingfu Xiao , Xiaoqi Zhou , Yi Tian , Juntao Zhu , Shouyong Xie , Zirong Tang , Yiying Zhu","doi":"10.1016/j.matchar.2025.115031","DOIUrl":"10.1016/j.matchar.2025.115031","url":null,"abstract":"<div><div>The development of non-precious metal-based electrocatalysts with high activity and stability is essential for HER reactions. Molybdenum carbides are emerging as promising low-cost electrocatalysts for the HER because of their platinum-like catalytic properties. Here, a one-step direct laser-induced fabrication is developed to synthesize the Mo<sub>3</sub>C<sub>2</sub>/rGO composite. Owing to the self-assembly process, a gelatin-facilitated Mo-ion GO matrix was transformed into hierarchically porous Mo<sub>3</sub>C<sub>2</sub>/rGO, which led to a catalytic surface enriched with defects. The interaction between various phases and the induced lattice defects in Mo<sub>3</sub>C<sub>2</sub>/rGO substantially boosts the hydrogen evolution reaction (HER) performance, which shows low overpotentials of 101 mV at a current density of 10 mA cm<sup>−2</sup>, a minimal Tafel slope of 52 mV dec<sup>−1</sup>, and remarkable stability lasting over 1000 cycles. This work offers significant guidance for developing high-efficiency HER catalysts through nanoscale interfacial engineering.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115031"},"PeriodicalIF":4.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820601","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

Influence of aging treatment on corrosion behaviors and mechanical properties of Al-4.0Cu-0.9Li-0.4 Mg alloy

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-04-09 DOI: 10.1016/j.matchar.2025.115022

Guang-jun Zeng , Rong Wu , Meng-yu Li , Chen-xi Deng , Yu-peng Xie , Yong Zhang , Jin-feng Li , Dan-yang Liu , Rui-feng Zhang

{"title":"Influence of aging treatment on corrosion behaviors and mechanical properties of Al-4.0Cu-0.9Li-0.4 Mg alloy","authors":"Guang-jun Zeng , Rong Wu , Meng-yu Li , Chen-xi Deng , Yu-peng Xie , Yong Zhang , Jin-feng Li , Dan-yang Liu , Rui-feng Zhang","doi":"10.1016/j.matchar.2025.115022","DOIUrl":"10.1016/j.matchar.2025.115022","url":null,"abstract":"<div><div>The mechanical properties, intergranular and exfoliation corrosion of the T6-aged and T8-aged Al-4.0Cu-0.9Li-0.4Mg alloys were systematically investigated, and the stress corrosion behavior was characterized by slow strain tensile tests and direct current potential drop (<em>DCPD</em>) method. It was revealed that T8-aged specimens showed a higher intergranular and exfoliation corrosion resistance, and their stress corrosion susceptibility factors (<em>I</em><sub><em>SSRT</em></sub>) were decreased compared to T6-aged specimens. Additionally, the stress corrosion cracking propagation rate of T6-aged specimens along the rolling direction (T6-RD) is higher than that of the T8-aged specimens along the rolling direction (T8-RD), which is mainly attributed to the precipitation-free zones and the secondary phase particles at grain boundaries in T6-aged alloys. However, the <em>DCPD</em> results showed that the T6-aged specimens along the transverse direction (T6-TD) exhibited enhanced stress corrosion resistance than T6-RD samples, resulting from the retardation effect of grain boundaries and sub-grains zones on crack tips. Meanwhile, the stress corrosion cracking propagation was dependent on the adjacent grain orientation, and the cracks were inclined to deviate from the grain boundaries to the intragranular when the twist angle difference between adjacent grains was relatively low. Thus, for T6-RD and T6-TD samples or the T6-TD and T8-RD samples, conventional intergranular corrosion and exfoliation corrosion indexes are not appropriate, and corrosion susceptibility should instead be evaluated using the complex <em>DCPD</em> method.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115022"},"PeriodicalIF":4.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820603","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

Quasi-in-situ EBSD study on tensile twinning activity caused by dynamic loading for extrusion-shear ZCW610 alloy

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-04-09 DOI: 10.1016/j.matchar.2025.115028

Jingzhe Wang , Zhi Wang , Zhihang He , Le Zhou , Feng Wang , Ziqi Wei , Pingli Mao

{"title":"Quasi-in-situ EBSD study on tensile twinning activity caused by dynamic loading for extrusion-shear ZCW610 alloy","authors":"Jingzhe Wang , Zhi Wang , Zhihang He , Le Zhou , Feng Wang , Ziqi Wei , Pingli Mao","doi":"10.1016/j.matchar.2025.115028","DOIUrl":"10.1016/j.matchar.2025.115028","url":null,"abstract":"<div><div>In this work, the twinning behavior of extruded ZCW610 alloy at room temperature was investigated during dynamic compression along extrusion direction (ED) by quasi-in-situ electron backscattering diffraction (EBSD). Statistics found that <span><math><mfenced><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow></mfenced></math></span> tensile twins are mainly formed and the volume fraction of twins tends to increase with increasing strain. The nucleation and growth of twins often occur at 3.5 % and 6.5 % strains in the early stages of deformation. The quasi-in-situ EBSD studies shown that most <span><math><mfenced><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow></mfenced></math></span> tensile twins formation are comply with Schmid's law. A large number of the “paratactic” and same orientation <span><math><mfenced><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow></mfenced></math></span> tensile twinning formed in single grain during dynamic compression are initiated by the same twin variants with highest Schmid factor (SF). Meanwhile, multiple “paratactic” or “non-paratactic” twins with different orientation occurred within some grain are general adjacent twin variants with high SF. Especially, the selection of twin variants with low SF is not comply with Schmid's law, which related to the strain compatibility factor (m’) in order to release local stress during dynamic loading. The study also showed that twinning generated by strain compatibility factors is prone to forming twin pairs or twin chains in the neighboring grains to accommodate the plastic deformation.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"224 ","pages":"Article 115028"},"PeriodicalIF":4.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817352","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