Corrosion‐Resistant Biomedical High‐Entropy Alloys: A Review

Abstract

High entropy alloys (HEAs) exhibit the outstanding properties, such as excellent antibacterial property, remarkable biocompatibility, and superior corrosion resistance, in the field of biomedical applications. Herein, we summarize the biomedical function of HEAs in aspects of the antibacterial behavior against planktonic gram‐negative/gram‐positive bacteria and biofilms, the biocompatibility inspired by low‐ cytotoxicity alloying elements. Considering the corrosive service environment of biomedical device, the corrosion behavior and mechanism are discussed in terms of alloying elements (Al, Ni, Cr, and Cu) and microstructure (phase composition and grain size). Additionally, the promising approaches to simultaneously achieve biomedical function and corrosion resistance, the possible application of additive manufacturing, and the prospective effects of short‐range orderings on the corrosion resistance are simply discussed.This article is protected by copyright. All rights reserved.

Chemical Composition Optimization of Biocompatible Non-Equiatomic High-Entropy Alloys Using Machine Learning and First-Principles Calculations

“…Ni has good mechanical properties, but shows a strong toxic effect. In addition, W could cause the blocked blood vessels to pass through [31][32][33][34][35][36][37]. Therefore, after continuous screening, the Ti-Nb-Ta-Hf-Zr alloy systems are selected as the input data for the machine learning method .…”

Defects Act in an “Introverted” Manner in FeNiCrCoCu High-Entropy Alloy under Primary Damage

“…The structural properties and performances of high-entropy alloys are unique and interesting issues that have attracted intensive attention [1][2][3][4][5][6][7][8][9][10]. HEAs consisting of four or more elements with equal atomic concentrations are intriguing materials because of their excellent comprehensive properties as structural materials [2] which contribute to sluggish diffusion [3,7,9], critical internal lattice distortion [8,[11][12][13], and corrosion resistance [14][15][16]. More demands for nuclear energy are met using HEAs, which are considered promising materials for fusion and generation IV fission reactors [17][18][19][20].…”