Deformation-induced HCP phase transformation of CrCoNiSi0.3 medium-entropy alloy under high strain rate tension-Reference-Cited by-同舟云学术

Deformation-induced HCP phase transformation of CrCoNiSi0.3 medium-entropy alloy under high strain rate tension

Published:2024-04-01 Issue:14 Volume:124 Page:
ISSN:0003-6951
Container-title:Applied Physics Letters
language:en
Short-container-title:

Author:

Chang Hui¹,Zhang Tuanwei¹^ORCID,Qiao Junwei²^ORCID,Liaw Peter K.³^ORCID,Jiao Zhiming¹,Li Zhiqiang¹,Quan Long⁴,Wang Zhihua¹^ORCID

Affiliation:

1. Shanxi Key Laboratory of Material Strength and Structural Impact, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology 1 , Taiyuan 030024, China

2. College of Materials Science and Engineering, Taiyuan University of Technology 2 , Taiyuan 030024, China

3. Department of Materials Science and Engineering, The University of Tennessee 3 , Knoxville, Tennessee 37996, USA

4. Key Laboratory of Advanced Transducers and Intelligent Control System, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology 4 , Taiyuan 030024, China

Abstract

The yield strength of a CrCoNiSi0.3 medium-entropy alloy is significantly increased from 450 MPa (quasi-static, 0.001 s−1) to 1600 MPa (at a strain rate of 5000 s−1) under dynamic tension, with a considerable ductility of 60%. The high strain-rate sensitivity (SRS) of strength and work hardening is obtained, and the strength SRS reaches 0.408. The dominant deformation mechanisms are abundant multiple-twinning, increasing fractions of deformation twins and phase transformation from face-centered-cubic to hexagonal-close-packed (HCP) phases with a strain rate. A universal dislocation-hardened constitutive model considering the evolution of the twin and HCP transformation is established to predict the flow stress and microstructure evolution.

Funder

National Natural Science Foundation of China

The Science and Technology 296 Innovation Teams of Shanxi Province

The National Science 297 Foundation

The US Army Research 298 Office

Publisher

AIP Publishing

Link

https://pubs.aip.org/aip/apl/article-pdf/doi/10.1063/5.0202924/19870037/141902_1_5.0202924.pdf

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