Severe deformation-induced microstructural heterogeneities in Cu64Zr36 metallic glass

Severe deformation-induced microstructural heterogeneities in Cu64Zr36 metallic glass
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Cu64Zr36 金属玻璃中严重变形引起的微观结构不均匀性

DOI:
10.1088/1361-651x/ac7c82
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发表时间:
2022-06
影响因子:
1.8
通讯作者:
Wang Limin
Wang Limin
中科院分区:
材料科学3区
文献类型:
--
作者:
Lu Xiaoqian;Feng Shidong;Li Lin;Zhang Yanhui;Wang Xiaoying;Li Zijing;Wang Limin

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抽象。形变诱导年轻化是提高非晶合金宏观塑性的有效方法。在这里,进行分子动力学模拟,以研究再生MG的原子结构和高压扭转(HPT)处理的力学行为。HPT诱导形成的软,硬区的MG,这显着改善微观结构的不均匀性。势能,对分布函数,短程有序,中程有序,和HPT变形MG的振动行为的特征。在略高于玻璃化转变温度的位置上,可以通过扭转角来调节软区的微观结构,最终控制镁合金由脆性向韧性的转变。这些研究结果提供了有价值的指导方针,设计具有增强的变形能力的MG。
Abstract. Deformation-induced rejuvenation is a promising strategy to improve the macroscopic plasticity of metallic glasses (MGs). Here, molecular dynamics simulations are performed to investigate the rejuvenated MGs’ atomic structure and mechanical behavior with high-pressure torsion (HPT) processing. The HPT induces the formation of soft and hard regions in MGs, which dramatically improves the microstructural heterogeneity. Potential energy, pair distribution function, short-range order, medium-range order, and vibrational behavior in HPT-deformed MGs are characterized. The microstructure of soft regions similar to the configuration slightly above the glass transition temperature can be adjusted by torsion angle, ultimately controlling the transformation of MGs from brittleness to ductility. These findings provide valuable guidelines for the design of MGs with enhanced deformability.
DOI: 10.1063/5.0020201
发表时间: 2020-09
影响因子: 3.2
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DOI: 10.1016/0001-6160(79)90055-5
发表时间: 1979-01-01
期刊: ACTA METALLURGICA
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ARGON, AS
通讯作者: ARGON, AS