Correlating Strength and Hardness of High‐Entropy Alloys

• Published in: Advanced engineering materials Vol. 23; no. 8
• Main Authors: Tian, Yanzhong, Li, Linlin, Li, Jingjing, Yang, Yang, Li, Song, Qin, Gaowu
• Format: Journal Article
• Language: English
• Published: 01.08.2021
• Subjects: 316 stainless steel; hardness; high-entropy alloys; ultimate tensile strength; yield strength
• ISSN: 1438-1656; 1527-2648
• DOI: 10.1002/adem.202001514

Strength and hardness of metallic materials are reported to correlate in a specified form. Among various equations, yield strength is generally converted from Vickers hardness (HV) via a three‐time relation due to the simple and nondestructive nature of hardness testing. Herein, a through literature review is made and data of strength and HV for face‐centered cubic (FCC) and body‐centered cubic (BCC) high‐entropy alloys (HEA) are collected. The yield strength and HV visibly deviate from the three‐time relation, but the ultimate tensile strength and HV roughly follow the three‐time relation. New linear relationships, which are universally applied to convert HV to yield strength and ultimate tensile strength, are proposed. Correlations between strength and hardness of high‐entropy alloys (HEAs) with single‐phase structures are revealed. Yield strength and hardness deviate dramatically from the three‐time relationship, and a constant value is considered. Ultimate tensile strength and hardness roughly follow the three‐time relationship. Face‐centered cubic HEAs and 316 stainless steels intrinsically share the same strength−hardness relationship.