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In the present paper the morphologies of sur-face structures and the anomalous contrast of β_1phase accompanying with the formation of bainiteplate in the Cu-Zn-Al shape memory alloy havebeen investigated in detail by the transmission elec-tron microscopy and diffraction.The experimentalresults have proved that the extra diffraction andanomalous contrast results from the surfacemartensite formed on the β_1 phase.However,thecrystal structure and morphology of the surfacemartensite are varied at different stage of bainiteformation.The observation of interfacial disloca-tion structure of bainite/β_1 matrix reveals thatthere is a large strain in the bainite transformationof β CuZnAl alloy.Based on the experiment resultsthe formation of surface martensite and bainitictransformation were discussed.
In the present paper the morphologies of sur-face structures and the anomalous contrast of β_1 phase accompanying with the formation of bainite plates in the Cu-Zn-Al shape memory alloy have been studied in detail by the transmission elec-tron microscopy and diffraction. proved that the extra diffraction andanomalous contrast results from the surfacemartensite formed on the β_1phase.However, thecrystal structure and morphology of the surfacemartensite are varied at different stage of bainiteformation.The observation of interfacial disloca tion structure of bainite / β_1 matrix reveals that athere is a large strain in the bainite transformation of β CuZnAl alloy. Based on the experiment result formation of surface martensite and bainitic transformation were discussed.