高强韧面心立方高熵合金的设计

Design of face-centered cubic high-entropy alloys with high strength and high ductility

摘要:

按照多主元设计理念所制备的高熵合金展现了高强度、高韧性以及良好的耐磨性、耐氧化和热稳定性等优异综合性能，使其有望成为一种优异的新型结构材料。高熵合金在成分设计上可通过调整各主元元素的浓度、添加间隙原子等方式调控合金的层错能和微观结构，引入析出强化、细晶强化和相变或孪晶诱导塑性效应等强韧化机制，进而改善合金的综合力学性能。本文主要总结了近年来非等原子比和间隙碳/氮原子添加的成分设计对面心立方高熵合金体系的微观结构、力学性能和变形机制的影响，旨在为新型高性能面心立方高熵合金的设计提供理论基础。

Abstract:

High-entropy alloys based on the multiple components design concept exhibit excellent comprehensive properties such as high strength, high toughness, good wear resistance, oxidation resistance and thermal stability, making it prospective to become an excellent new structural material. As for the composition design, high-entropy alloys can adjust its stacking fault energy and microstructure by changing the concentration of each principal element, doping interstitial atoms and so on, and then introduce multiple strengthening and toughening mechanisms such as precipitation strengthening, fine grain strengthening, phase transformation or twinning-induced plasticity effect, thereby improving its comprehensive mechanical properties. In this paper, the effects of composition design with non-equiatomic and interstitial C/N atom additions on the microstructure, mechanical properties and deformation mechanism of face-centered cubic high-entropy alloys are summarized, so as to provide the theoretical basis for the design of the new high-performance face-centered cubic high entropy alloys.