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利用透射电镜、选区电子衍射等手段研究了Cu 2 5Al 3Mn形状记忆合金淬火态马氏体亚结构特征及其在加热过程中的变化。实验合金淬火态马氏体内部亚结构为 (12 1) 2H孪晶 ,该合金马氏体中产生T谱的孪晶是一些具有不同厚度的、平行入射电子束的片状非相干散射体 ,孪晶亚结构中最薄孪晶片厚度小于 2 .0 2nm ;在加热过程中 ,部分 2H马氏体向 18R马氏体转变 ,出现了层错亚结构特征
The characteristics of quenched martensite substructures of Cu 2 5Al 3Mn shape memory alloys and their changes during heating were investigated by transmission electron microscopy and selected area electron diffraction. The as-quenched martensite substructure in the experimental alloy is (12 1) 2H twins. The twins that generate T-spectra in the martensitic alloy are sheet-shaped incoherent scatterers with different thickness and parallel incident electron beam, The thinnest twins in the twin sub-structure are less than 0.2 nm in thickness. During the heating process, part of the 2H martensite is transformed to 18R martensite, resulting in the presence of stratified fault sub-structure