铜铝锰钛形状记忆合金的微观组织、超弹性和形状记忆效应

(1.厦门大学材料学院,福建 厦门361005; 2.哈尔滨工业大学(深圳)材料科学与工程学院,广东 深圳 518055)

Cu-Al-Mn基形状记忆合金; 马氏体稳定化; 超弹性; 形状记忆效应

Microstructure,superelasticity and shape memory effect of Cu-Al-Mn-Ti shape memory alloy
CHEN Xinren1,ZHANG Fan1,CHI Mengyuan1,ZHANG Jixun1,

(1.College of Materials,Xiamen University,Xiamen 361005,China; 2.School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China)

Cu-Al-Mn-based shape memory alloy; martensite stabilization; superelasticity; shape memory effect

DOI: 10.6043/j.issn.0438-0479.201803014

备注

制备了5种掺杂Ti的Cu-Al-Mn基形状记忆合金,并对其显微组织、马氏体相变、超弹性和形状记忆效应进行研究.结果表明,Cu-Al-Mn-Ti形状记忆合金组织中存在两种L21相,包括L21-Cu2AlMn母相和L21-Cu2TiAl析出相.在变形过程中,应力诱发了L21-Cu2AlMn母相到马氏体相的相转变,由于存在弥散的L21-Cu2TiAl相,部分应力诱发马氏体相发生稳定化.因此,制备的5种成分的形状记忆合金(Cu-13.3Al-9.7Mn-4.3Ti、Cu-12.4Al-5.0Mn-4.3Ti、Cu-12.3Al-6.8Mn-4.2Ti、Cu-12.7Al-9.8Mn-2.1Ti和Cu-12.9Al-5.3Mn-2.8Ti)在室温下变形的同时具有超弹性和形状记忆效应.

Five types of Cu-Al-Mn-based shape memory alloy doped with Ti were synthetized and their microstructure,martensitic transformation,superelasticity,and shape memory effect were studied.The results show that there are two kinds of L21 phase in the microstructure of Cu-Al-Mn-Ti shape memory alloy,including the parent phase of L21-Cu2AlMn and the precipitated phase of L21-Cu2TiAl.The stress induces the phase transformation of L21-Cu2AlMn parent phase to martensite phase during deformation.The dispersed L21-Cu2TiAl phase has the effect of precipitation strengthening,which induces the stabilization of martensite phase by partial stress.Therefore,five types of Cu-Al-Mn-Ti shape memory alloys,Cu-13.3Al-9.7Mn-4.3Ti,Cu-12.4Al-5.0Mn-4.3Ti,Cu-12.3Al-6.8Mn-4.2Ti,Cu-12.7Al-9.8Mn-2.1Ti and Cu-12.9Al-5.3Mn-2.8Ti,not only show superelasticity,but also have shape memory effect in deformation at room temperature.