文章信息/Info

Title:

Second Phase Strengthening in High-Entropy Alloys

作者:

溫曉燦; 張凡; 雷智鋒; 吳淵; 劉雄軍; 王輝; 呂昭平

（北京科技大學新金屬材料國家重點實驗室，北京100083）

Author(s):

WEN Xiaocan;  ZHANG Fan;  LEI Zhifeng;  WU Yuan;  LIU Xiongjun;  WANG Hui;  LU Zhaoping

（State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China）

關(guān)鍵詞:

高熵合金; 第二相強化; 強化機制

Keywords:

high-entropy alloys;  second phase strengthening;  strengthening mechanism

DOI:

10.7502/j.issn.1674-3962.2019.03.06

文獻標志碼:

A

摘要:

高熵合金是由多種元素以等原子比或近等原子比合金化所形成的一類新型金屬材料。不同于傳統(tǒng)的以一元或二元為主的合金設計思想，高熵合金顛覆性的合金設計理念使得其具有獨特的原子結(jié)構(gòu)特征，因而呈現(xiàn)出許多優(yōu)異的力學、物理及化學性能。但其力學性能還有需繼續(xù)提高之處，F(xiàn)CC結(jié)構(gòu)的高熵合金通常塑性較好但強度偏低，而BCC結(jié)構(gòu)的高熵合金強度較高但塑性較小。第二相強韌化已經(jīng)被應用在高熵合金中以改善其強韌性，目前已經(jīng)開發(fā)了大量高性能第二相強韌化高熵合金。然而，由于高熵合金獨特的結(jié)構(gòu)和性能特點，其強韌化行為特點和機制與傳統(tǒng)合金并不完全相同。從高熵合金第二相強韌化的研究現(xiàn)狀出發(fā)，簡要介紹了高熵合金中的第二相種類及其強韌化機理，并對高熵合金第二相強韌化的研究進行了簡單的展望。

Abstract:

Recently, a new alloy design strategy, i.e., high-entropy alloys (HEAs), was proposed based on the principle of equal-molar or near-equalmolar fraction for all the components. Different from traditional alloy design strategy which usually blends with one or two elements as the principal constituent, such revolutionary alloy design concept leads to the unique atomic structure, which giving rise to unique mechanical, physical and chemical properties of HEAs. However, mechanical properties of HEAs need to be further improved, e.g., FCC (face-centered cubic)-structured HEA usually has a large ductility but a low strength, BCC (body-centered cubic)-structured HEA usually has a high strength but a low ductility. Second phase strengthening has been widely applied in HEAs and was proved to be effective to strengthening or toughening HEAs. However, due to the unique atomic structure of HEAs, behavior and mechanism of second phase strengthening were different from that in traditional alloys. Here in this short review manuscript, the current research status and underlying mechanism of second phase strengthening were briefly reviewed. The future perspective of second phase strengthening in HEAs was also discussed.