Correlating Strength and Hardness of High‐Entropy Alloys

Abstract

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.

Effect of Reticulate Unit Spacing on Microstructure and Properties of Biomimetic 7075 Aluminum Alloy by Laser Cladding

“…In general, hardness reflects the plasticity resistance of a material, and hardness was proportional to strength [ 22 ]. In previous studies, the average microhardness of the 7075 aluminum alloy matrix was HV 0.2 .…”

Multimaterial Additive Manufacturing of Graded Laves Phase Reinforced NiAlTa Structures by Means of Laser Metal Deposition

“…For a wide range of alloys, a ratio of 1:3 between yield strength and Vickers hardness was observed by various researches as reported in the study by Tian et al, [ 32 ] representing a linear relationship between hardness and tensile strength. Considering that, this relationship is only a rough approximation and might differ especially for intermetallic alloys, it still suggests that the observed increase in hardness by 230% also indicates a tremendous increase in tensile strength.…”

Nano-structuring of a high entropy alloy by severe plastic deformation: Experiments and crystal plasticity simulations

“…However, the hardness to strength ratio is affected by the pile-up behaviors and the ability of the material to deform by shear [99]. Tian et al [100] suggest empirical relation between the hardness and yield strength of HEAs. This is because HEAs are seen to deviate from the HV ≈ 3 * σ y relation.…”