Diffraction and Morphology Study of Surface Structures Accomponying with the Formation of α'Plate(Bainite)in a Cu-Zn-AI Alloy

摘要

In the present paper the morphologies of sur-face structures and the anomalous contrast of β1phase 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 β1 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/β1 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.