The metastable constituent effects on size-dependent deformation behavior of nanolaminated micropillars: Cu/FeCoCrNi vs Cu/CuZr

Yufang Zhao ¹Jinyu Zhang ¹YaQiang Wang ¹Shenghua Wu ¹Xiaoqing Liang ¹Kai Wu ¹Gang Liu ¹Jun Sun¹

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作者信息

1. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China
折叠

Abstract

Metastable high entropy alloys (HEAs) and amorphous metallic glasses (MGs),with the chemical disordered character,are intensively studied due to their excellent performance.Here,we introduce Cu to separately constrain these two metastable materials and comparatively investigate their deformation behaviors and mechanical properties of Cu/HEA FeCoCrNi and Cu/MG CuZr nanolaminated micropillars in terms of intrinsic layer thickness h and extrinsic pillar diameter D.The metastable HEA layers,as the hard phase in Cu/HEA micropillars,are stable and dominate the deformation,while transformation (crystallization) occurs in MG which plays a minor role in deformation of Cu/MG micropillars.The h-controlled deformation mode transits from the D-independent homogenous-like deformation at large h to the D-dependent shear banding at small h in both Cu/HEA and Cu/MG micropillars.Although both Cu/HEA and Cu/MG micropillars exhibit a maximum strain hardening capability controlled by h,the former manifests much lower hardening capability compared with the latter.The intrinsic size h and extrinsic size D have a strong coupling effect on the strength of Cu/HEA and Cu/MG micropillars.The strength of strength of Cu/HEA micropillars exhibits the D-dependent transition from "smaller is stronger" to "smaller is weaker" with increasing h.By contrast,the strength of Cu/MG micropillars exhibits the transition from bulk-like D-independent behavior at large h to small volume D-dependent behavior (smaller is stronger) at small h.

Key words

High-entropy alloys/Metallic glasses/Nanolaminated micropillars/Size effect

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基金项目

This work was supported by the National Natural Science Foundation of China(51722104)

This work was supported by the National Natural Science Foundation of China(51625103)

This work was supported by the National Natural Science Foundation of China(51790482)

This work was supported by the National Natural Science Foundation of China()

This work was supported by the National Natural Science Foundation of China(51761135031)

National Key Research and Development Program of China(2017YFA0700701)

111 Project 2.0 of China(BP2018008)

Fok Ying-Tong Education Foundation(161096)

Fundamental Research Funds for the Central Universities.Y.F.Z..is also supported by the Fundamental Research Funds for the C(xzy022019071)

We would thank S.W.Guo,Y.H.Li and J.Li for their kind help with microstructural characterization of materials()

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

被引量2

参考文献量87

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