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首页> 外文期刊>Materials Science and Engineering >Shape memory effect promoted through martensite stabilization induced by the precipitates in Cu-Al-Mn-Fe alloys
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Shape memory effect promoted through martensite stabilization induced by the precipitates in Cu-Al-Mn-Fe alloys

机译：Cu-Al-Mn-Fe合金中析出物引起的马氏体稳定促进形状记忆效应

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In this study, the microstructure, martensitic transformation, stabilization of the stress-induced martensite and shape memory effect of (Cu78Al12Fe4Mn6)(100-x)Zr-x (x = 1 and 2) and (Cu78Al12Fe4Mn6)(100-y)Nb-y (y = 1 and 2) alloys were investigated. All alloys exhibit bcc phase separation, resulting in a microstructure consisted of dominant L2(1)-Cu2AlMn parent, fine bcc beta(Fe,Al,Zr) or beta(Fe,Al,Nb) phase and a small quantity of 2 H martensite. All the studied alloys show the reversible martensitic transformation, and the forwards martensitic transformation temperatures are below room temperature. Although the alloys have main L2(1) parent before deformation, during deformation and after unloading, the stress-induced 2 H martensite can be stabilized due to the resistance of a large amount of beta(Fe,Al,Zr) or beta(Fe,Al,Nb) particles. Furthermore, the stabilization degree of the stress-induced martensite happens more obviously while further increasing the amounts of particles. The stabilized martensite can be recovered through heating, thus the alloys possess good shape memory properties. The largest shape memory effects are 4.1%, 4.4%, 4.4% and 4.0% respectively for x = 1, 2, and y = 1, 2 alloys.
机译：在这项研究中，（Cu78Al12Fe4Mn6）（100-x）Zr-x（x = 1和2）和（Cu78Al12Fe4Mn6）（100-y）Nb的微观结构，马氏体转变，应力诱导马氏体的稳定和形状记忆效应研究了-y（y = 1和2）合金。所有合金均表现出bcc相分离，从而形成由主要的L2（1）-Cu2AlMn母体，精细的bccβ（Fe，Al，Zr）或beta（Fe，Al，Nb）相和少量2 H马氏体组成的微观结构。 。所有研究的合金都显示出可逆的马氏体相变，并且正向马氏体相变温度低于室温。尽管合金在变形前，变形期间和卸荷后具有主要的L2（1）母体，但由于大量β（Fe，Al，Zr）或β（Fe ，Al，Nb）颗粒。此外，应力诱发的马氏体的稳定化程度更加明显，同时进一步增加了颗粒的数量。稳定的马氏体可以通过加热来回收，因此该合金具有良好的形状记忆性能。对于x = 1、2和y = 1、2合金，最大的形状记忆效应分别为4.1％，4.4％，4.4％和4.0％。

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