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Eliminate the contradiction between temperature and toughness by grain-boundary delamination in heterogeneous ultrafine-grained lamellar steels 在异质超细晶粒层状钢中通过晶界分层消除温度与韧性之间的矛盾
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials Research Letters
Pub Date : 2024-12-01 DOI: 10.1080/21663831.2024.2399880
Bo Yang, Fuxing Yin, Baoxi Liu, Liying Sun, Tianlong Liu, Hui Yu, Andrey Belyakov, Zhichao Luo
Heterostructured ferritic steels with bimodal-grained lamellar (BG-L) and ultrafine-grained lamellar (UFG-L) microstructure were prepared through a warm deformation process. The BG-L steel exhibits enhanced mechanical properties compared to conventional quenched and tempered (QT) steel. While the UFG-L steel demonstrates an outstanding combination of strength, ductility, and toughness. Furthermore, the UFG-L steels exhibit no ductile-to-brittle transition (DBT) from room temperature (RT) to liquid nitrogen temperature (LNT) and the Charpy impact energy remains as high as 314 J at LNT. The enhanced toughness at LNT can be attributed to the crack-arrester mechanism caused by grain-boundary delamination.
通过温变形工艺制备了具有双峰晶粒层状（BG-L）和超细晶粒层状（UFG-L）微观结构的异种结构铁素体钢。与传统的淬火回火（QT）钢相比，BG-L 钢的机械性能有所提高。而 UFG-L 钢则在强度、延展性和韧性方面都有出色的表现。此外，从室温（RT）到液氮温度（LNT），UFG-L 钢没有出现韧性到脆性的转变（DBT），在 LNT 温度下的夏比冲击能仍然高达 314 J。液氮温度下韧性的增强可归因于晶界分层引起的裂纹-断裂机制。
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引用次数: 0
The activation of multiple slip systems in polycrystalline zirconium by using automated lattice rotation framework 利用自动晶格旋转框架激活多晶锆中的多重滑移系统
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials Research Letters
Pub Date : 2024-12-01 DOI: 10.1080/21663831.2024.2402370
Huigang Shi, Jianye Chen, Junqiang Lu, Libing Zhu, Lefu Zhang, Jiuxiao Li, Weijie Lu, Xianglong Guo
Understanding the deformation mechanism in polycrystalline metals is critical to use them in high-value high-risk applications. Here, we report an automated framework based on lattice rotation analysis for accurately identifying slip system and assessing the multiple slip activities in large data set of polycrystalline Zr, aims to statistically provide deep insight on deformation mechanism of Zr. Results show that multiple slip is the dominant slip system rather than single slip system. This method can be applied as a complementary method to the intragranular misorientation axis (IGMA) method and can act as bridges between macro-mechanical response and microstructural deformation mechanisms.
要将多晶金属用于高价值、高风险的应用领域，了解其变形机制至关重要。在此，我们报告了一种基于晶格旋转分析的自动化框架，该框架可准确识别滑移系统，并评估多晶锆大型数据集中的多重滑移活动，旨在从统计学角度深入了解锆的变形机制。结果表明，多重滑移是主要的滑移系统，而不是单一滑移系统。该方法可作为晶内错向轴（IGMA）方法的补充方法，并可作为宏观机械响应和微观结构变形机制之间的桥梁。
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引用次数: 0
Microstructural evolution and toughening mechanism of WC-Co composite prepared by amorphous-crystallization method 非晶-结晶法制备的 WC-Co 复合材料的微结构演化和增韧机理
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials Research Letters
Pub Date : 2024-12-01 DOI: 10.1080/21663831.2024.2405085
Maobao Xu, Haibin Wang, Xuemei Liu, Hao Lu, Xiaoyan Song
In this study, toughening of WC-Co composite prepared by amorphous-crystallization method was investigated. Co-rich nanoparticles, a Co(W,C) solid solution, were incorporated into the WC matrix through the process integrating crystallization of amorphous Co2W4C powder and its in-situ reaction with carbon. The microstructural evolution of the ceramic-metal composite during fabrication was studied in detail. Owing to the interactions between Co-rich nanoparticles coherent with the WC matrix and the dislocations and stacking faults inside WC grains, the composite exhibited high hardness and strength combined with exceptional fracture toughness. The mechanisms for the synergistic improvement of mechanical properties of the composite were disclosed.
本研究探讨了非晶-结晶法制备的 WC-Co 复合材料的增韧问题。通过非晶 Co2W4C 粉末的结晶及其与碳的原位反应，富 Co 纳米颗粒（一种 Co（W，C）固溶体）被加入到 WC 基体中。我们详细研究了陶瓷-金属复合材料在制造过程中的微观结构演变。由于富钴纳米粒子与碳化钨基体之间的相互作用，以及碳化钨晶粒内部的位错和堆积断层，复合材料表现出了高硬度、高强度和优异的断裂韧性。研究揭示了该复合材料机械性能协同改善的机制。
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引用次数: 0
Unconventional { 10 1 ¯ 2 } twinning assisted by pyramidal II stacking faults. 非常规{10 1¯2}孪晶由锥体II型叠层断层辅助。
IF 8.6 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials Research Letters
Pub Date : 2024-10-28 eCollection Date: 2025-01-01 DOI: 10.1080/21663831.2024.2406910
Yang Hu, Dennis M Kochmann

Twinning significantly affects the deformation behavior of hexagonal close-packed Mg, so a thorough understanding of twin nucleation and growth mechanisms is required for enhancing the properties of Mg-based materials. The commonly observed { 10 1 ¯ 2 } tension twins have been traditionally linked to 〈c + a〉 dislocation dissociation, which results in zonal dislocations with large Burgers vectors several times that of a single twinning dislocation and some residual dislocations. Contrarily, our molecular dynamics simulations reveal { 10 1 ¯ 2 } twin nucleation from pyramidal II stacking faults through atomic shuffling without shear displacements. This introduces an alternative twin nucleation mechanism, different from the classically accepted mechanism of dislocation dissociation.

孪晶对六方密排Mg的变形行为有显著影响，因此深入了解孪晶成核和生长机制是提高Mg基材料性能的必要条件。通常观察到的{10¯2}张力孪晶传统上与< c + a >位错解离有关，这导致具有比单个孪晶位错大几倍的伯格矢量的带状位错和一些残余位错。相反，我们的分子动力学模拟显示，在没有剪切位移的情况下，锥体II层错通过原子洗牌形成{10¯2}孪核。这引入了一种替代的孪核机制，不同于经典接受的位错解离机制。
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引用次数: 0
A novel atomic mechanism of fcc → hcp → bcc phase transition in a gradient nanostructured compositionally complex alloy 梯度纳米结构成分复杂合金中 fcc → hcp → bcc 相变的新型原子机制
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials Research Letters
Pub Date : 2024-09-19 DOI: 10.1080/21663831.2024.2405228
Wenqing Yang, Lei Qian, Jiasi Luo, Xu-Sheng Yang
This study investigates the plastic deformation-induced fcc → hcp → bcc phase transition within nanograins in an ultra-strong gradient nanostructured surface layer on Fe45Mn35Cr10Co10 compositional...
本研究探讨了在 Fe45Mn35Cr10Co10 成分的超强梯度纳米结构表层中纳米晶粒内塑性变形诱导的 fcc → hcp → bcc 相变。
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引用次数: 0
Unraveling the origin of ductility in multilayered Ti/Nb composites: role of dislocation evolution 揭示多层钛/铌复合材料延展性的起源：位错演变的作用
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials Research Letters
Pub Date : 2024-09-15 DOI: 10.1080/21663831.2024.2402913
S. Jiang, Y. T. Li, Z. F. He, R. Lin Peng, Z. Hegedüs, U. Lienert, N. Jia
Dislocation evolution in multilayered Ti/Nb composites processed by accumulative roll bonding under uniaxial tension was quantitatively evaluated by high-energy X-ray diffraction. The composites wi...Dynamic evolution of dislocations, rather than only dislocation densities obtained by post-mortem analysis, is found to explain ductility of multilayered composites, which can be tailored by adjust...
利用高能 X 射线衍射定量评估了在单轴拉力下通过累积轧制粘接法加工的多层钛/铌复合材料中的位错演变。...研究发现，位错的动态演变，而不仅仅是位错密度的死后分析，可以解释多层复合材料的延展性，这种延展性可以通过调整位错密度来调整。
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引用次数: 0
Enhanced strength and ductility in (CoCrNi)92Mo2Al6 medium entropy alloy via dual heterogeneous structures 通过双异质结构提高 (CoCrNi)92Mo2Al6 中熵合金的强度和延展性
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials Research Letters
Pub Date : 2024-09-11 DOI: 10.1080/21663831.2024.2399579
Tiancheng Li, Haiyang Chen, Yubo Huang, Qiang Hao, Hongchuan Ma, Zaifeng Zhou, Shilei Li, Yan-Dong Wang
In the present (CoCrNi)92Mo2Al6 medium entropy alloy (MEA), a dual heterogeneous structure is achieved by regulating the degree of recrystallization of the FCC matrix and σ phase precipitation thro...
在目前的(CoCrNi)92Mo2Al6中熵合金（MEA）中，通过调节FCC基体的再结晶程度和σ相的析出程度，实现了双重异质结构。
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引用次数: 0
Achieving Elinvar effect over a wide temperature range in an additively manufactured titanium alloy 在添加型钛合金的宽温度范围内实现埃林瓦效应
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials Research Letters
Pub Date : 2024-09-04 DOI: 10.1080/21663831.2024.2396030
Chengqian Lu, Delun Gong, Yandi Jia, Yuxiang Zhang, Yingying Shen, Wentao Hou, Na Ma, Zengqian Liu, Rui Yang, Yulin Hao
Temperature-insensitive elastic modulus known as Elinvar effect is typically achievable in metastable titanium alloys only through thermomechanical processing. Here reports that a directly additive...
对温度不敏感的弹性模量被称为埃林瓦尔效应（Elinvar effect），通常只有通过热机械加工才能在可变型钛合金中实现。本文报告了一种直接添加...
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引用次数: 0
Strain hardening mechanism induced by basal/pyramidal dislocation reactions in a 3D-printed high-strength titanium alloy 三维打印高强度钛合金中基底/锥形位错反应诱发的应变硬化机制
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials Research Letters
Pub Date : 2024-08-29 DOI: 10.1080/21663831.2024.2395433
Qiaodan Yan, Xin Lin, Jun Yu, Xufei Lu, Weidong Huang
The high yield ratio and low strain hardening ability of titanium alloys significantly limit their engineering applications. In this work, a Ti65Zr30Cu5 (at.%) alloy with nanoscale α laths was addi...
钛合金的高屈服比和低应变硬化能力极大地限制了其工程应用。在这项研究中，一种具有纳米级 α 板条的 Ti65Zr30Cu5 (at.%) 合金被添加到了钛合金中。
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引用次数: 0
Microtwinning mechanism revealed by its orientation dependence and tension-compression asymmetry in γ′ precipitate-strengthened Ni-based superalloys 通过γ′沉淀强化镍基超合金的取向依赖性和拉伸-压缩不对称揭示微缠结机理
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Materials Research Letters
Pub Date : 2024-08-26 DOI: 10.1080/21663831.2024.2396044
Pengfei Qu, Wenchao Yang, Qiang Wang, Chen Liu, Jiarun Qin, Jun Zhang, Lin Liu
Microtwinning is observed as an important mechanism in γ′ precipitate-strengthened Ni-based superalloys during service at intermediate temperatures. Here, the effect of crystal orientation and stre...For the first time, this work explains why microtwinning exhibits orientation dependence and tension-compression asymmetry while stacking faults do not, although they both originate from the activi...
微孪晶是γ′沉淀强化镍基超合金在中温服役期间的一种重要机理。这项研究首次解释了为什么微孪晶表现出取向依赖性和拉伸-压缩不对称，而堆叠断层却没有，尽管它们都源于γ′淀......这项研究首次解释了为什么微孪晶表现出取向依赖性和拉伸-压缩不对称，而堆叠断层却没有，尽管它们都源于γ′淀...
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