(1． 中南大学 材料科学与工程学院，长沙 410083；
2． 合肥工业大学 材料科学与工程学院， 合肥 230009；
3． 合肥工业大学 机械与汽车工程学院， 合肥 230009)
摘 要: 利用透射电镜、 选区电子衍射等手段研究了Cu-25Al-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（121-）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2.02nm； 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。
关键字: Cu-Al-Mn合金; 马氏体; 孪晶
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering, Hefei University of Technology,
Hefei 230009, China;
3. School of Mechanical and Automotive Engineering,
Hefei University of Technology, Hefei 230009, China）
Abstract:The twin substructure characteristics of the martensite as-quenched in Cu-25Al-3Mn alloy and its changing during aging were studied by means of TEM and SAEDP. The substructure of martensite in the tested alloy is confirmed to be (121-) twin by calculation. The electron diffraction pattern of these twins is resulted from the different thickness, incoherent scattering body, which is parallel to the transmitted beam. The thickness of the minimum twin is thinner than 2.02nm. During heating, a part of the 2H martensite transforms to M18R martensite.
Key words: Cu-Al-Mn alloy; martensite; twin
