Substantially enhanced homogeneous plastic flow in hierarchically nanodomained amorphous alloys

Ge Wu (), Sida Liu, Qing Wang, Jing Rao, Wenzhen Xia, Yong-Qiang Yan, Jürgen Eckert, Chang Liu (), En Ma and Zhi-Wei Shan
Additional contact information
Ge Wu: Xi’an Jiaotong University
Sida Liu: Shandong University
Qing Wang: Shanghai University
Jing Rao: Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1
Wenzhen Xia: Anhui University of Technology
Yong-Qiang Yan: Xi’an Jiaotong University
Jürgen Eckert: Austrian Academy of Sciences, Jahnstraße 12
Chang Liu: Xi’an Jiaotong University
En Ma: Xi’an Jiaotong University
Zhi-Wei Shan: Xi’an Jiaotong University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract To alleviate the mechanical instability of major shear bands in metallic glasses at room temperature, topologically heterogeneous structures were introduced to encourage the multiplication of mild shear bands. Different from the former attention on topological structures, here we present a compositional design approach to build nanoscale chemical heterogeneity to enhance homogeneous plastic flow upon both compression and tension. The idea is realized in a Ti-Zr-Nb-Si-XX/Mg-Zn-Ca-YY hierarchically nanodomained amorphous alloy, where XX and YY denote other elements. The alloy shows ~2% elastic strain and undergoes highly homogeneous plastic flow of ~40% strain (with strain hardening) in compression, surpassing those of mono- and hetero-structured metallic glasses. Furthermore, dynamic atomic intermixing occurs between the nanodomains during plastic flow, preventing possible interface failure. Our design of chemically distinct nanodomains and the dynamic atomic intermixing at the interface opens up an avenue for the development of amorphous materials with ultrahigh strength and large plasticity.

Date: 2023
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DOI: 10.1038/s41467-023-39296-6

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