摘要
本工作制备了不同混合熵的四种锰基合金以研究时效处理以及混合熵对合金力学性能的影响。首先表征了不同成分以及不同热处理工艺下合金的微观组织和力学性能,研究发现,合金的力学性能与混合熵存在明显的依存关系。固溶处理状态下,合金的强度与塑性随着混合熵提高而线性增高。混合熵最低的Mn-15at%Cu时效后易析出α-Mn,而高混合熵能促进固溶体形成能力,阻碍第二相的产生,提高合金力学性能的稳定性。研究表明,相较于应变硬化指数,应变硬化率的斜率更能反映在变形阶段孪生与位错增殖协调的塑性变形机制。
Four kinds of Mn-based alloys with different mixing entropy were prepared to study the effects of aging treatment and mixing entropy on the mechanical properties.Firstly,the microstructure and mechanical properties of the alloys under different components and different heat treatment processes were characterized.It is found that the mechanical properties of the alloys are obviously dependent on the mixing entropy.Under the solution treated state,the tensile strength and plasticity of the alloys linearly increase with the increase of mixing entropy.As for Mn-15at%Cu ally with the lowest mixing entropy,α-Mn was found to precipitate easily after aging,and high mixing entropy can promote the formation ability of solid solution,hinder the generation of the second phase,and therefore improve the stability of the mechanical properties of the alloys.The results show that in comparison with the strain hardening index,the slope of strain hardening rate can better reflect the plastic deformation mechanism coordinated between twinning and dislocation proliferation at deformation stage.
作者
牛红康
田青超
NIU Hongkang;TIAN Qingchao(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2022年第S02期314-319,共6页
Materials Reports
关键词
Mn基阻尼合金
混合熵
力学性能
孪生诱导塑性
Mn-based damping alloys
mixed entropy
mechanical property
twinning induce plasticity
