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Title: Phase-Transformation Ductilization of Brittle High-Entropy Alloys via Metastability Engineering

High-entropy alloys (HEAs) in which interesting physical, chemical, and structural properties are being continuously revealed have recently attracted extensive attention. Body-centered cubic (bcc) HEAs, particularly those based on refractory elements are promising for high-temperature application but generally fail by early cracking with limited plasticity at room temperature, which limits their malleability and widespread uses. In this paper, the “metastability-engineering” strategy is exploited in brittle bcc HEAs via tailoring the stability of the constituent phases, and transformation-induced ductility and work-hardening capability are successfully achieved. Finally, this not only sheds new insights on the development of HEAs with excellent combination of strength and ductility, but also has great implications on overcoming the long-standing strength–ductility tradeoff of metallic materials in general.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [1]
  1. Univ. of Science and Technology Beijing (China). State Key Lab. for Advanced Metals and Materials
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Sciences Directorate. Chemical and Engineering Materials Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 51531001; 51671018; 51422101; 51371003; B07003; 2015DFG52600; IRT_14R05; FRF-TP-15-004C1
Type:
Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Volume: 29; Journal Issue: 30; Journal ID: ISSN 0935-9648
Publisher:
Wiley
Research Org:
Univ. of Science and Technology Beijing (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Natural Science Foundation of China (NNSFC); International S&T Cooperation Program of China; Program for Changjiang Scholars and Innovative Research Team in University (China); Fundamental Research Fund for the Central Universities (China)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ductilization; high-entropy alloys; metastability engineering; phase transformations
OSTI Identifier:
1364323
Alternate Identifier(s):
OSTI ID: 1374089