Cu-Zn-Al 형상기억합금의 결정립 미세화에 의한 기계적 성질의 개선 = Mechanical Properties by Grain Refinement in Cu-Zn-Al Shape Memory Alloy

다국어 초록 (Multilingual Abstract)

In Cu-Tn-Al shape memery alloys, it is necessary for practical application that mechanical properties of the alloys is modified by grain refinement. In present work, grain was refined by adding misch metal, Mn or Ni and mechanical and thermal cycling test have been done. In the case of Mn and Ni effect of grain refinement were small. It was, however, predominated by a factor of 20 in the case of misch metal. The fracture stress and the strain of the refined alloy with size of 50㎛ were increased with 2 and 1.3 times than those of the alloy not to be refined, respectively. Shape memory effect was not affected significantly by decreasing grain size, but fatigue life by thermal cycling in the refined alloy was increased with 1.5 times.

목차 (Table of Contents)

• 1. 서론
• 2. 실험방법
• 시편제작
• 열처리, 조직관찰과 변태점 측점
• 인장 및 형상기억효과 시험
• 열사이클에 의한 피로시험
• 3. 실험결과
• 첨가원소에 따른 결정립크기
• 기계적 성질의 변화
• 형상기억효과와 열사이클에 의한 피로수명
• 4. 고찰
• 첨가원소에 의한 결정립미세화
• 결정립미세화에 의한 기계적 성질과 형상기억효과의 변화
• 열사이클에 의한 피로수명
• 5. 결론