| Title |
Effect of Aging on Damping Capacity of Cu - X%Mn Alloys |
| Authors |
정태신(Tae Shin Chung) ; 신중환(Joong Hwan Jun) ; 이영국(Young Kook Lee) ; 최종술(Chong Sool Choi) |
| Abstract |
The objective of the present study is to investigate the effects of isochronal and isothermal aging on microstructure and damping capacity of Cu-47%Mn and Cu-55%Mn alloys. In case of the isochronal aging for 8 hours, the maximum damping capacity was shown at 425 for the Cu-47%Mn alloy and 400 for the Cu-55%Mn alloy, respectively. This is due to the lowest value of tetragonality(c/a ratio) which is closely associated with the fcc→fct martensitic transformation. In case of the isothermal aging at 400℃, the aging time far highest damping capacity was 18 hours in the Cu-47%Mn alloy and 8 hours in the Cu-55%Mn alloy, respectively. TEM observation revealed that tweed microstructure of fct martensite is responsible for the high damping capacity. |