Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Helical coil springs property in Cu-Zn-Al shape memory alloy

Cu-Zn-Al 형상기억합금의 코일스프링 특성

  • Kwon, Hee-Kyung (R/D Division, Korea Heavy Industries & Construction Co., Ltd.) ;
  • Choi, Chang-Soo (Dept. of Mechanical Engineering, Kyungpook National University) ;
  • Chung, In-Sang (Dept. of Mechanical Engineering, Kyungpook National University)
  • 권희경 (한국중공업(주) 기술연구소) ;
  • 최창수 (경북대학교 공과대학 금속공학과) ;
  • 정인상 (경북대학교 공과대학 금속공학과)
  • Published : 1996.09.30
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Abstract

In this study, the properties of coil spring made by Cu-Zn-Al and B added shape memory alloys are investigated. The measurement of recovery displacement and energy with increasing weight, and thermocycling properties have been studied using displacement measuring device. Transformation temperature and phase change by thermocycling have been also investigated by DSC and X-ray diffractometer. Grain size of the alloy is refined from 1.2mm to $400{\mu}m$ by 0.06wt% of B addition. The maximum recovery energy of the coil spring for B added alloy is larger than that of no B added alloy, it is because of grain refinement. And shape memory ability of the coil spring by thermocycling decrease with increasing thermocycling after thermocycle under load. The degradation of shape memory properties of coil spring by thermocycling is improved by B addition.

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