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Cu25Zn4.5A1是一种典型的形状记忆合金,该合金的母相具有β型有序点阵,在低温和外力作用下发生有序母相向热弹性马氏体转变,并随卸载和升温而逆转,形成宏观形状回复,即所谓形状记忆效应。目前发现具有这种效应的合金多达数十种,但已获应用开发的合金主要是NiTi和CuZnA1系。后者的主要优点是价廉和加工方便,在科技和工业界较受重视。合金的形状记忆效应通常可由其应力一应变曲线来描述。本工作采用SEM拉伸台动态观察技术,在获取σ—ε曲线的同时观察了样品表面显微特征的变化,这对于SME的研究及合金的应用开发都是至为重要的。
Cu25Zn4.5A1 is a typical shape memory alloy with a β-type ordered lattice in the parent phase. The ordered mother phase transition to thermoelastic martensitic transformation occurs at low temperatures and external forces and reverses with unloading and warming , Forming a macro shape recovery, the so-called shape memory effect. Up to now dozens of alloys have been found to have this effect, but the alloys that have been developed for application are mainly NiTi and CuZnAl. The latter’s main advantage is cheap and convenient processing, more emphasis on science and technology and industry. The shape memory effect of an alloy can usually be described by its stress-strain curve. In this work, the dynamic observation technology of SEM tensile stage was used to observe the change of the microscopic characteristics of the sample while obtaining the σ-ε curve, which is of great importance for the research of SME and the application and development of alloys.