Intrinsic tensile ductility in strain hardening multiprincipal element metallic glass

• 成果类型: Article
• 署名作者: Zhang, Zhibo; Zhang, Shan; Wang, Qing; Lu, Anliang; Chen, Zhaoqi; Yang, Ziyin; Luan, Junhua; Su, Rui; Guan, Pengfei; Yang, Yong
• 署名单位: City University of Hong Kong; Chinese Academy of Engineering Physics; Beijing Computational Science Research Center (CSRC); Shanghai University; City University of Hong Kong; Hangzhou Dianzi University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-11169
• DOI: 10.1073/pnas.2400200121
• 发表日期: 2024-04-30
• 关键词: shear bands; mechanical-properties; thermal-diffusivity; amorphous-alloys; cu; crystallization; microstructure; deformation; TRANSITION; plasticity

摘要

Traditional metallic glasses (MGs), based on one or two principal elements, are notoriously known for their lack of tensile ductility at room temperature. Here, we developed a multiprincipal element MG (MPEMG), which exhibits a gigapascal yield strength, significant strain hardening that almost doubles its yield strength, and 2% uniform tensile ductility at room temperature. These remarkable properties stem from the heterogeneous amorphous structure of our MPEMG, which is composed of atoms with significant size mismatch but similar atomic fractions. In sharp contrast to traditional MGs, shear banding in our glass triggers local elemental segregation and subsequent ordering, which transforms shear softening to hardening, hence resulting in shear - band self - halting and extensive plastic flows. Our findings reveal a promising pathway to design stronger, more ductile glasses that can be applied in a wide range of technological fields.