高熵合金强韧化机制研究进展-中国材料进展

文章信息/Info

Title:: Progress in the Strengthening and Toughening Mechanisms of High Entropy Alloy

Author(s):: MA Jun; WANG Jianzhong; AO Qingbo; LI Ye; WU Chen; TANG Huiping; （State Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China)

Keywords:: high entropy alloy; high entropy effect; strengthening and toughening mechanism; dislocations; deformation

摘要:: 高熵合金由于其独特的多主元元素组成，具有很多超越传统合金的性能，包括良好的低温强韧性和高温强度、结构稳定性等，是未来合金研发的重要方向。总结了近10年来在高熵合金强韧化机制方面的研究进展，列举了如位错强化、变形诱导孪晶(twin induced plasticity, TWIP)强化、变形诱导相变（transformation induced plasticity, TRIP）强化、细晶强化、沉淀强化、固溶强化等机制的典型应用范例，分别评述了这些强韧化机制的潜力和局限，如前3种机制单独应用时强韧化效果有限，后3种机制提高韧性效果有限。最后探讨了高熵合金强韧化研究的未来重点方向，即深入认识影响这些机制的起源，例如层错能对TWIP和TRIP机制的影响；并联合应用多种强韧化机制，以达到优异的综合性能。

Abstract:: High entropy alloys are composed of multiple primary elements, they outperform many traditional alloys in the cryogenic toughness, high temperature strength and phase stability, and have been the focus of futural development of alloys. This paper summarized the research progress on the strengthening and toughening mechanisms of high entropy alloys in recent 10 years. The typical applications of the strengthening and toughening mechanisms such as dislocation strengthening, twin induced plasticity(TWIP), transformation induced plasticity (TRIP), fined grain strengthening, precipitation strengthening, solid solution strengthening were reviewed. The potentials and limits of these strengthening and toughening mechanisms were analyzed, for example, the first 3 mechanisms only show limited strengthening and toughening effects when used alone, and the last 3 mechanisms show limited toughening effects. The future development directions of strengthening and toughening mechanisms for high entropy alloys were discussed, for example, deeply understanding the mechanisms source and combining multiple mechanisms to achieve best comprehensive properties.