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

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The carbothermic reduction behaviour of saprolitic laterite nickel ore and the enhancement mechanisms of selective nickel reduction induced by CaO and CaF2 incorporation 腐殖型红土镍矿碳热还原行为及CaO和CaF2加入对镍选择性还原的增强机理
IF 6.6 2区 材料科学
Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-25 DOI: 10.1016/j.jmrt.2025.07.217
Zhichao Hu , Jinlong Wang , Zhengliang Xue , Wei Wang , Fang Huang , Xiaohao Mei
{"title":"The carbothermic reduction behaviour of saprolitic laterite nickel ore and the enhancement mechanisms of selective nickel reduction induced by CaO and CaF2 incorporation","authors":"Zhichao Hu ,&nbsp;Jinlong Wang ,&nbsp;Zhengliang Xue ,&nbsp;Wei Wang ,&nbsp;Fang Huang ,&nbsp;Xiaohao Mei","doi":"10.1016/j.jmrt.2025.07.217","DOIUrl":"10.1016/j.jmrt.2025.07.217","url":null,"abstract":"<div><div>This paper investigates the phase transformation in carbothermic reduction of saprolitic laterite nickel ore, with a detailed analysis of kinetics factors inhibiting the selective reduction of nickel and the mechanisms by which CaO and CaF<sub>2</sub> enhance it. Experimental results demonstrate that the metallization rate of nickel exceeds that of iron in identical mineral phases. However, iron predominantly resides in readily reducible oxides, whereas nickel is chiefly contained in hard-to-reduce silicates. Following a 60-min reduction process conducted at 1200 °C, the metallization rate of nickel and iron of the ore with 9.5 wt% coal blended reached 47.2 % and 68.1 %, respectively. Both CaO and CaF<sub>2</sub> exhibit potential for selective nickel reduction. CaO demonstrates superior effectiveness in enhancing the selective reduction of nickel, whereas CaF<sub>2</sub> exhibits better performance in promoting the aggregation of the alloy and improving the metallization rates of both iron and nickel. The experimental findings demonstrate that the incorporation of 12 wt% CaO elevates the metallization rate of nickel and iron to 77.2 % and 72.9 %, respectively, while the incorporation of 4 wt% CaF<sub>2</sub> substantially increases these ratios to 95.3 % and 89.9 %.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 392-405"},"PeriodicalIF":6.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720852","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
Ultrasonic softening-hardening mechanism and constitutive model for ultrasonic riveting of 2A10 aluminum alloy 2A10铝合金超声铆接软硬化机理及本构模型
IF 6.6 2区 材料科学
Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-24 DOI: 10.1016/j.jmrt.2025.07.216
Heng Zhang, Weijun Liu, Zewei Yuan
{"title":"Ultrasonic softening-hardening mechanism and constitutive model for ultrasonic riveting of 2A10 aluminum alloy","authors":"Heng Zhang,&nbsp;Weijun Liu,&nbsp;Zewei Yuan","doi":"10.1016/j.jmrt.2025.07.216","DOIUrl":"10.1016/j.jmrt.2025.07.216","url":null,"abstract":"<div><div>Ultrasonic riveting (UR) effectively improves riveting quality, thereby enhancing the safety and reliability of aircraft structures. This study proposes a method for constructing an UR constitutive relationship model and combines systematic experimental analysis to scientifically investigate the mechanism by which UR improves riveting quality. This study explores the impacts of ultrasonic softening-hardening effects on the riveting stress-strain under different strain rates and amplitudes, as well as the microstructural evolution of the rivets at various amplitudes. The results of this study indicate that ultrasonic vibration has a remarkable effect on decreasing the riveting stress. When the amplitude is 8.83 μm and the strain rate is 1.43 × 10 s<sup>−1</sup>, the yield strength of the rivets decreases by 56.04 %. In this study, the rivets exhibit a residual softening phenomenon, and the residual hardening effect intensifies as the amplitude increases. Electron backscatter diffraction (EBSD) analysis showed that ultrasonic vibration could promote the formation of low-angle grain boundaries (LAGB) and achieve grain refinement. When the amplitude was increased from 5.64 μm to 8.83 μm, the LAGB in the range of 2°–15° increased by 35.26 % and the number of grains increased by 96.07 %. This study also constructs a UR constitutive model that takes into account the changes in amplitude. Compared to experimental data, the average accuracy of this model is 99.638 %. The results of this study contribute to the promotion of the application of ultrasonic vibration in the riveting process.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 556-570"},"PeriodicalIF":6.6,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724355","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
A novel low copper content antibacterial high-entropy alloy: Role of synergistic effect of multiple elements 一种新型低铜含量抗菌高熵合金:多元素协同效应的作用
IF 6.6 2区 材料科学
Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-24 DOI: 10.1016/j.jmrt.2025.07.204
S.Y. Chen , X.W. Ding , D.X. Guo , L.L. Ni , S.G. Wan , Z.X. Zhang , L.J. Zhou , P.P. Min , H. Shen , Y.F. Jia , J.Q. Shen , L. Wang
{"title":"A novel low copper content antibacterial high-entropy alloy: Role of synergistic effect of multiple elements","authors":"S.Y. Chen ,&nbsp;X.W. Ding ,&nbsp;D.X. Guo ,&nbsp;L.L. Ni ,&nbsp;S.G. Wan ,&nbsp;Z.X. Zhang ,&nbsp;L.J. Zhou ,&nbsp;P.P. Min ,&nbsp;H. Shen ,&nbsp;Y.F. Jia ,&nbsp;J.Q. Shen ,&nbsp;L. Wang","doi":"10.1016/j.jmrt.2025.07.204","DOIUrl":"10.1016/j.jmrt.2025.07.204","url":null,"abstract":"<div><div>Antibacterial high-entropy alloy (AHEA) is a novel metallic material known for its excellent antibacterial properties due to its significant copper (Cu) content. This study presents a low copper content AHEA (LCC-AHEA) to improve plasticity and corrosion resistance by eliminating Cu-rich phases. The LCC-AHEA shows a compressive yield strength of ∼751 MPa and tensile yield strength of ∼525 MPa, resulting from the refined microstructures. Furthermore, the LCC-AHEA exhibits a 100 % antibacterial rate against <em>Escherichia coli</em> (<em>E. coli</em>) within three days for the poor wettability and the synergistic effect of multiple ions. The poor wettability hinders the adhesion of bacteria and biofilms. Additionally, the release of Al, Co, Ni, and Cu ions due to corrosion results in morphological changes in <em>E. coli</em> and has a synergistic effect on suppressing bacterial cell division by inhibiting both DNA replication and mitosis. Moreover, the passive zone of LCC-AHEA is four times greater than that of stainless steel, preventing the dissolution of harmful ions following the inactivation of <em>E. coli</em>. These excellent properties of LCC-AHEA demonstrate its great potential for medical applications.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 581-596"},"PeriodicalIF":6.6,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724297","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
Cyclic Phase Transformation-Driven β-Grain Growth in TA1 Pure Titanium: Synergistic Regulation via Thermal Grooves and Sub-Boundary Energy TA1纯钛中循环相变驱动的β晶粒生长:热槽和亚边界能量的协同调节
IF 6.6 2区 材料科学
Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-24 DOI: 10.1016/j.jmrt.2025.07.134
Qiang Zhong , Changrong Ran , Xueqiang Dong , Jin Na , Lu Wang , Jinwen Ye
{"title":"Cyclic Phase Transformation-Driven β-Grain Growth in TA1 Pure Titanium: Synergistic Regulation via Thermal Grooves and Sub-Boundary Energy","authors":"Qiang Zhong ,&nbsp;Changrong Ran ,&nbsp;Xueqiang Dong ,&nbsp;Jin Na ,&nbsp;Lu Wang ,&nbsp;Jinwen Ye","doi":"10.1016/j.jmrt.2025.07.134","DOIUrl":"10.1016/j.jmrt.2025.07.134","url":null,"abstract":"<div><div>In titanium alloy, the β-phase grain size at high temperatures and its effect on subsequent α-phase precipitation was a key determinant of material properties. However, precisely controlling the high-temperature β-phase size remained a significant challenge. In this study, the growth kinetics of β-phase in TA1 pure titanium under single-phase and cyclic phase transformation were comparatively analyzed to elucidate the dual regulation mechanism of β-phase grain size by thermal groove and phase transformation. Experimental results indicated that when the temperature exceeded 850°C, α-phase growth was constrained by the grain-boundary thermal groove effect, while above the β-phase transformation temperature (882°C), β-phase growth was hindered by through-grain thermal grooves. Notably, the β-phase size did not increase continuously with temperature and time during single phase transition, whereas it exhibited sustained growth during cyclic phase transitions. Microscopic mechanism analysis revealed that atomic diffusion limitations induced by the β → α<sub>s</sub> phase (secondary α phase) transition led to the formation of α-sub-boundary networks. These α-subgrain boundaries facilitated the secondary growth of the β-phase by providing an additional energy drive of approximately 50%, effectively overcoming the migration barriers imposed by grain-boundary thermal grooves. Through the synergistic effect of thermal grooves and cyclic phase transformation, the limiting size of the β-phase (0.71-22.48 mm) could be accurately prepared by controlling the number of phase transformations (1-4 times). This study provides valuable insights for optimizing the microstructural design of titanium alloys.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144738109","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
New insights into the microstructure characteristics and crystallographic orientation development of hot isostatic pressed Zr705 alloy 热等静压Zr705合金显微组织特征及结晶取向发展新认识
IF 6.6 2区 材料科学
Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-24 DOI: 10.1016/j.jmrt.2025.07.021
You-wei Zhang , Zhongde Shan , Fuzhou Han , Yong Zang , Chunlin Bao , Qian Yao
{"title":"New insights into the microstructure characteristics and crystallographic orientation development of hot isostatic pressed Zr705 alloy","authors":"You-wei Zhang ,&nbsp;Zhongde Shan ,&nbsp;Fuzhou Han ,&nbsp;Yong Zang ,&nbsp;Chunlin Bao ,&nbsp;Qian Yao","doi":"10.1016/j.jmrt.2025.07.021","DOIUrl":"10.1016/j.jmrt.2025.07.021","url":null,"abstract":"<div><div>In the present study, a systematic investigation was conducted on the microstructural features and orientation distributions of the hot isostatic pressed (HIP) Zr705 alloy by using electron backscatter diffraction and TEM techniques. Results indicated the microstructure of Zr705 alloy was fully transformed into Widmanstätten structure, consisting of alternating α-Zr plates and inter-plate β-Zr films with their average width and thickness measured to be 20 μm and 250 nm. The misorientation angles distribution map of α grain boundaries exhibit three distinct concentrated peaks around 3°, 60° and 90°, which are in accordance with the classical Burgers orientations. The α/β misorientation characteristics were quantitatively confirmed through crystallographic analysis of the β→α transformation pathway governed by Burgers orientation relationship (BOR). Crystallographic orientations analyses further demonstrated strict adherence to the BOR (<span><math><mrow><msub><mrow><mo>[</mo><mrow><mn>11</mn><mover><mn>2</mn><mo>‾</mo></mover><mn>0</mn></mrow><mo>]</mo></mrow><mrow><mi>α</mi><mo>−</mo><mtext>Zr</mtext><mspace></mspace></mrow></msub><mrow><mo>‖</mo><mspace></mspace></mrow><msub><mrow><mo>[</mo><mrow><mn>1</mn><mover><mn>1</mn><mo>‾</mo></mover><mn>1</mn></mrow><mo>]</mo></mrow><mrow><mi>β</mi><mo>−</mo><mtext>Zr</mtext></mrow></msub></mrow></math></span> and <span><math><mrow><msub><mrow><mo>(</mo><mn>0001</mn><mo>)</mo></mrow><mrow><mi>α</mi><mo>−</mo><mtext>Zr</mtext><mspace></mspace></mrow></msub><mo>‖</mo><msub><mrow><mspace></mspace><mrow><mo>(</mo><mn>110</mn><mo>)</mo></mrow></mrow><mrow><mi>β</mi><mo>−</mo><mtext>Zr</mtext></mrow></msub></mrow></math></span>) between β-Zr phase and adjacent α-Zr plates in the HIP treated Zr705 alloy. In addition, representative TEM and HRTEM observations were also presented to reveal the well-obeyed BOR between adjacent α-Zr and β-Zr phases. The present work not only offers a comprehensive microstructural analysis of HIP-fabricated Zr-705 alloy, but also provide new insights into pressure-controlled microstructural homogenization for large-size zirconium alloy valve components.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 378-385"},"PeriodicalIF":6.6,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720844","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
Enhancing the specific modulus of Al–Li alloys: A machine learning approach to micro-alloying element identification 提高铝锂合金的比模量:一种微合金元素识别的机器学习方法
IF 6.2 2区 材料科学
Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-24 DOI: 10.1016/j.jmrt.2025.07.187
Lyu Jing , Li Yanan , Li Xiwu , Zheng Lei , Xiao Wei , Liu Qilong , Liu Rui , Li Zhihui , Xiong Baiqing
{"title":"Enhancing the specific modulus of Al–Li alloys: A machine learning approach to micro-alloying element identification","authors":"Lyu Jing ,&nbsp;Li Yanan ,&nbsp;Li Xiwu ,&nbsp;Zheng Lei ,&nbsp;Xiao Wei ,&nbsp;Liu Qilong ,&nbsp;Liu Rui ,&nbsp;Li Zhihui ,&nbsp;Xiong Baiqing","doi":"10.1016/j.jmrt.2025.07.187","DOIUrl":"10.1016/j.jmrt.2025.07.187","url":null,"abstract":"<div><div>To enhance the specific modulus of aerospace structural materials, this study employs machine learning methods to optimize the micro-alloying composition of Al–Li alloys. A total of 151 alloy composition-elastic modulus samples were analyzed. Feature generation and selection techniques were then applied. As a result, eight features with strong correlations to the specific modulus were identified. Through hyperparameter optimization of the GBR model and subsequent predictions, Mn was identified as a beneficial micro-alloying element. Experimental validation demonstrated that Mn-containing Al–Li alloys exhibit higher specific modulus. Through microstructural characterization and DFT calculations, it was found that the Mn element significantly improves the elastic modulus of the alloy by forming dispersed phases and enhancing solid solution strengthening. This study highlights the effectiveness of machine learning in alloy composition design.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 175-183"},"PeriodicalIF":6.2,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144714273","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
Pc-C10: An innovative carbon allotrope with concurrent metallic conductivity and exceptional mechanical property Pc-C10:一种创新的碳同素异形体,同时具有金属导电性和卓越的机械性能
IF 6.2 2区 材料科学
Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-24 DOI: 10.1016/j.jmrt.2025.07.207
Lingyu Liu , Yan Zhuang , Mengdong Ma , Li Zhu , Pan Ying , Meng Hu , Yueqing Li , Julong He , Qinyong Zhang
{"title":"Pc-C10: An innovative carbon allotrope with concurrent metallic conductivity and exceptional mechanical property","authors":"Lingyu Liu ,&nbsp;Yan Zhuang ,&nbsp;Mengdong Ma ,&nbsp;Li Zhu ,&nbsp;Pan Ying ,&nbsp;Meng Hu ,&nbsp;Yueqing Li ,&nbsp;Julong He ,&nbsp;Qinyong Zhang","doi":"10.1016/j.jmrt.2025.07.207","DOIUrl":"10.1016/j.jmrt.2025.07.207","url":null,"abstract":"<div><div>Carbon, renowned for its versatility in bonding and structural diversity, has long been a focal point of materials research. Despite extensive studies on carbon allotropes, a significant challenge remains: the development of carbon materials that combine both exceptional mechanical properties and electrical conductivity. Here, we propose a novel <em>sp</em><sup>2</sup>-<em>sp</em><sup>3</sup> hybridized tetragonal carbon allotrope <em>Pc</em>-C<sub>10</sub> via first-principle calculations. This structure is more energetically favorable than graphite at pressures above 55 GPa, suggesting the potential for synthesis via high-pressure phase transitions. Our results show that <em>Pc</em>-C<sub>10</sub> not only exhibits metallic conductivity through a quasi-one-dimensional conducting channels but also demonstrates superconductivity with a critical temperature of 0.25 K. This new carbon structure displays remarkable mechanical properties, including a hardness of 26 GPa, tensile and shear strengths over 80 GPa for outstanding resistance to deformation and fracture. In particular, a unique damage-self-repair-strengthening behavior is displayed during shear. The combination of these distinctive properties makes this novel carbon material a promising candidate for future applications in electronics, superconductivity, and structural materials technology.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 143-149"},"PeriodicalIF":6.2,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713320","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 performance of Al–Mg–Si alloy reinforced agro-waste residue for structural applications Al-Mg-Si合金增强农业废渣结构力学性能研究
IF 6.6 2区 材料科学
Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-24 DOI: 10.1016/j.jmrt.2025.07.215
Festus Ben , Takalani Madzivhandila
{"title":"Mechanistic performance of Al–Mg–Si alloy reinforced agro-waste residue for structural applications","authors":"Festus Ben ,&nbsp;Takalani Madzivhandila","doi":"10.1016/j.jmrt.2025.07.215","DOIUrl":"10.1016/j.jmrt.2025.07.215","url":null,"abstract":"<div><div>Al–Mg–Si alloys offer lightweight properties and an excellent strength-to-weight ratio, making them attractive for engineering applications. However, limitations in their mechanical performance have driven interest in reinforcing these alloys with synthetic ceramics and agro-waste residues. Although previous studies have explored plantain peel ash, rice husk ash, and coconut shell ash, comprehensive investigations into cassava peel ash (CPA) and alumina-reinforced Al–Mg–Si alloys remain limited. This study examines the mechanistic performance of CPA/Alumina-reinforced Al–Mg–Si composites manufactured via a two-stage stir casting procedure, with CPA contents of 2–10 wt%. Composites were evaluated for porosity, density, hardness, tensile and yield strength, ductility, E-modulus, toughness, strain at failure, and wear resistance. Microstructural analysis revealed heterogeneous, roundish reinforcement dispersion, with XRF and XRD confirming silica as the dominant oxide phase. The composites exhibited lightweight characteristics with porosity between 0.93 % and 1.94 %. Hardness ranged from 57.10 to 68.24 BHN, tensile strength from 95.35 MPa (CPA-10) to 210.68 MPa (CPA-4), and yield strength peaked at 175.09 MPa (CPA-4). CPA-0 showed the highest toughness (5.55 J) and ductility (12.22 %), while wear resistance improved progressively with CPA, peaking at CPA-10 (1.280 mm/mm<sup>3</sup>). CPA-4, with 4 wt% CPA and 6 wt% alumina, emerged as the optimal composition, offering an excellent balance of strength, stiffness, and moderate ductility. The findings confirm that cassava peel ash, when optimally hybridized with alumina, can serve as a sustainable, eco-friendly reinforcement, significantly enhancing the mechanical performance of aluminum alloys for broader structural and engineering applications.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 212-225"},"PeriodicalIF":6.6,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720756","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
Micro-nanoscale strain fields around the crack tip of 2024 aluminum alloy 2024铝合金裂纹尖端的微纳应变场
IF 6.2 2区 材料科学
Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-24 DOI: 10.1016/j.jmrt.2025.07.213
Jiawei Liu , Fengchao Lang , Yongming Xing
{"title":"Micro-nanoscale strain fields around the crack tip of 2024 aluminum alloy","authors":"Jiawei Liu ,&nbsp;Fengchao Lang ,&nbsp;Yongming Xing","doi":"10.1016/j.jmrt.2025.07.213","DOIUrl":"10.1016/j.jmrt.2025.07.213","url":null,"abstract":"<div><div>Aluminum alloy 2024 is widely used in aerospace and automobile manufacturing due to its high specific strength, plasticity and good welding performance. The quantitative characterization of the micro-nanoscale deformation fields near the crack tip during the crack propagation is crucial for understanding the fracture mechanical behaviors. In this study, cross-gratings with a frequency of 10,000 lines/mm were prepared on the surface of the 2024 aluminum alloy using scanning electron microscopy (SEM). The strain distribution in the range beyond 100 nm from the crack tip under load was investigated using geometric phase analysis (GPA) method and compared with the theoretical and simulated predictions. The results indicate that at a stress of 0.01 <span><math><mrow><msub><mi>σ</mi><mi>y</mi></msub></mrow></math></span> (the lowest load), the experiment converge with the linear elastic fracture mechanics (LEFM) and simulated results in the range beyond 770 nm from the crack tip. At stress levels of 0.04 <span><math><mrow><msub><mi>σ</mi><mi>y</mi></msub></mrow></math></span> and 0.14 <span><math><mrow><msub><mi>σ</mi><mi>y</mi></msub></mrow></math></span> (the higher loads), the errors of plastic zone at the crack tip between Irwin plasticity model predictions and experimental results are within 5.5 %. The strain distribution observed experimentally is consistent with the predictions of LEFM outside the theoretical plastic zone at the crack tip, thereby confirming the applicability of both EPFM and LEFM for characterizing deformation fields at the crack tip of aluminum alloy at the micro-nanoscale.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 201-211"},"PeriodicalIF":6.2,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144714272","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
Enhanced bonding stability of Fe oxide layer on low carbon steel via low-pressure air oxidation 低压空气氧化法提高了低碳钢上氧化铁层的结合稳定性
IF 6.2 2区 材料科学
Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-07-24 DOI: 10.1016/j.jmrt.2025.07.205
Jun Sang Park , Hidemi Kato , Eun-Ae Choi , Seung Zeon Han
{"title":"Enhanced bonding stability of Fe oxide layer on low carbon steel via low-pressure air oxidation","authors":"Jun Sang Park ,&nbsp;Hidemi Kato ,&nbsp;Eun-Ae Choi ,&nbsp;Seung Zeon Han","doi":"10.1016/j.jmrt.2025.07.205","DOIUrl":"10.1016/j.jmrt.2025.07.205","url":null,"abstract":"<div><div>The oxidation behavior of low carbon steel (SS400) was investigated at 500 °C under different air pressures: 1 atm, 1/10,000 atm, and 1/50,000 atm. The results showed that the oxide growth rate at 1/10,000 atm was higher than at atmospheric pressure, primarily due to the reduced formation of dense Fe<sub>2</sub>O<sub>3</sub> on the oxide surface. Oxide layers formed at 1/10,000 atm and 1/50,000 atm exhibited better adhesion to the steel substrate, as they featured larger oxide grains and increased contact area with the steel, leading to a greater number of chemical bonds at the oxide-steel interface. Although Kirkendall pores were more prominent at lower air pressures, they did not significantly affect the bonding strength between the oxide and the steel.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"38 ","pages":"Pages 109-117"},"PeriodicalIF":6.2,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144711279","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
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