| Title |
A Study on the Structural Analysis and high temperature Aging Effects of Cu - Zn - Al Alloys |
| Authors |
백두현(Doo Hyun Baik); 김상주(Sang 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. |