발간논문

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Vol.36, No.5, 655 ~ 660, 1998
Title
Effect of Aging on Damping Capacity of Cu - X%Mn Alloys
정태신 , 신중환 , 이영국 , 최종술 Tae Shin Chung , Joong Hwan Jun , Young Kook Lee , 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.
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