발간논문

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Vol.29, No.9, 885 ~ 894, 1991
Title
A Study on the Structural Analysis and high temperature Aging Effects of Cu - Zn - Al Alloys
백두현Doo Hyun Baik, 김상주Sang Joo Kim
Abstract
A study has been made of the crystallography and thermal stability of Cu-Zn-Al Shape Memory Alloys. The structure and the phase transformation of the alloys were studied by X-ray diffractometer, electron microscopy and resistivity measurement. The damping characteristics of them were also measured. The Ms temperatures varied from -61℃ to 77℃ with concentration of Zn and Al. The cystallographic structure of the parent phase and martensite was found to be DO₃(or L2₁) and modified 18R(β=88°) respectively. When aged at temperatures ranged from 250 to 350℃, the transformation temperatures were lowered and a maximum hardness was obtained. The aged Cu-26Zn-4.75Al and Cu-21Zn-6Al alloys had the structure of mixture of αand βwhereas the Cu-14.9Zn-8Al alloy had a and r structures. The Cu-14.9Zn-8Al alloy had a considerably higher thermal stability than others.
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