Effects of Heat Treatment on Damping Characteristics of Fe-Al Alloys

Fe-Al 합금의 제진특성에 미치는 열처리의 영향

  • Lee, J.H. (Department of Metallurgy and Materials Eng., Kookmin Univ.) ;
  • Kim, K.J. (Department of Metallurgy and Materials Eng., Kookmin Univ.) ;
  • Kim, D.K. (Department of Metallurgy and Materials Eng., Kookmin Univ.) ;
  • Lee, K.H. (Division of Metals, Korea Institute of Science and Technology) ;
  • Shin, M.C. (Division of Metals, Korea Institute of Science and Technology)
  • 이진형 (국민대학교 공과대학 금속.재료공학과) ;
  • 김기주 (국민대학교 공과대학 금속.재료공학과) ;
  • 김동관 (국민대학교 공과대학 금속.재료공학과) ;
  • 이규환 (한국과학기술연구원 금속연구부) ;
  • 신명철 (한국과학기술연구원 금속연구부)
  • Received : 1996.03.19
  • Published : 1996.09.25

Abstract

Fe-5.7%AI-1.1%Cr-0.5%Si damping alloys containing 0%C and 0.12%C were heat-treated at $800^{\circ}C$ for an hour and then cooled by using some different methods. The damping behaviors of these alloys were observed by optical microscopy, X-ray diffraction and a specific damping capacity(SDC) test. Effect of cooling method on microstructures and the internal stresses of these alloys were negligible while the damping capacity of these alloys was considerably deteriorated by water quenching. The (200) texture was mainly developed by water quenching while the (110) texture by furnace cooling. These results were interpreted by the magnetization behaviors of the ferromagnetic $\alpha$ ferrite. The easy axis of magnetization in <100> direction means that <100> axis has more $180^{\circ}$ magnetic domain walls than $90^{\circ}$ ones. Thus. $180^{\circ}$ magnetic domain walls were more formed by water quenching, which deteriorated the damping capacity of these alloys. Consequently, the amount of magnetic domain walls giving good damping capacity became less so that the damping capacity was poor in water quenching.

Acknowledgement

Supported by : 학술진흥재단