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高熵合金 L12 纳米析出相的调控研究进展
Research Progress on the Control of L1 2 Nanoprecipitation in High-entropy Alloys
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- DOI:
- 作者:
- 高熵合金；析出强化；成分调控；热机械处理
high-entropy alloy; precipitation strengthening; composition control; thermal-mechanical treatment
- 作者单位:
- 西北工业大学 凝固技术国家重点实验室
State Key Laboratory of Solidification Processing
- 关键词:
- 高熵合金；析出强化；成分调控；热机械处理
high-entropy alloy; precipitation strengthening; composition control; thermal-mechanical treatment
- 摘要:
- 高熵合金是一种由多种合金元素以等原子比或近等原子比组成的新型金属材料，其独特的原子结构和合金设计理念使高熵合金具有优异的性能。 在高熵合金中通过引入韧性的 L1 2 纳米析出相阻碍位错运动，不仅可以提高强度还可以保证良好的拉伸塑性， 这种 L12 析出相强化的高熵合金引起了广泛关注。 对于 L1 2 相析出强化高熵合金而言，调控析出相的大小、形貌、分布及体积分数对改善析出强化高熵合金的力学性能至关重要。 基于此，本文回顾了合金成分的选择和热机械处理工艺参数，如时效温度、时效时间、塑性变形等对 L1 2 相的影响规律，总结设计新型 L1 2 相强化高熵合金的方法，并对 L1 2 相析出强化高熵合金的研究进行了综述和展望。
High-entropy alloys are a new type of metal material composed of various alloy elements with equal or nearlyequal atomic ratios. High-entropy alloys have excellent properties due to their unique atomic structure and alloy design concept. In the precipitation strengthened high-entropy alloys, the ductile L1 2 nanoprecipitation can hinder the dislocation movement. This phenomenon can not only improve the strength but also ensure good ductility, which has attracted widespread research interest. Furthermore, it is important to control the size, morphology, distribution and volume fraction of the L1 2 phase in the alloy to improve the mechanical properties of precipitation strengthened high-entropy alloys. Based on this, the influences of alloy composition and thermal-mechanical treatment process parameters such as aging temperature, aging time and plastic deformation on the L1 2 phase are reviewed in this article. Additionally, the methods for designing new L1 2 phase strengthened high entropy alloys are summarized. Finally, the research on L1 2 -precipitation strengthened high entropy alloys is briefly summarized and outlooked.