In the present paper the morphologies of sur- face structures and the anomalous contrast of β_1 phase accompanying with the formation of bainite plate in the Cu-Zn-Al shape memory alloy have been investigated in detail by the transmission elec- tron microscopy and diffraction.The experimental results have proved that the extra diffraction and anomalous contrast results from the surface martensite formed on the β_1 phase.However,the crystal structure and morphology of the surface martensite are varied at different stage of bainite formation.The observation of interfacial disloca- tion structure of bainite/β_1 matrix reveals that there is a large strain in the bainite transformation of β CuZnAl alloy.Based on the experiment results the formation of surface martensite and bainitic transformation were discussed.
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