High-Strain-Rate Deformation of Fe-6.5wt.%Si Alloys using a Split Hopkinson Pressure Bar Technique

홉킨슨 압력봉법을 이용한 Fe-6.5wt.%Si 합금의 고변형률속도 거동

  • Yoon, Young-Ki (Dept.of Mechanical Engineering, Graduate School of Chonnam National Universityisy) ;
  • Yoon, Hi-Seak (Dept.of Mechanical Engineering, Chonnam National Universityisy) ;
  • Umakoshi, Yukichi (Osaka University) ;
  • Yasuda, Hiroyuki Y. (Osaka University)
  • 윤영기 (전남대학교 대학원 기계공학과) ;
  • 윤희석 (전남대학교 기계공학과) ;
  • ;
  • Published : 2001.07.01


Many researches have published numerous papers about the high-strain-rate obtained from Split Hopkinson Pressure Bar(SHPB) tests. And 6.5wt%Si steel is widely known as an excellent magnetic material because its magnetostriction is nearly zero. Single crystals are prepared by the Floating Zone(FZ) method, which melts the alloy by the use of a high temperature electron beam in a pure argon gas condition. In this paper, the fracture behavior of the poly crystals and single crystals (DO$_3$phase) of Fe-6.5wt%Si alloy by SHPB test is observed. The comparison of high-strain-rate results with static results was done. Obtained main results are as follows: (1) Fe-6.5wt%Si alloy has higher strength at high-strain-rate tensile. SHPB results of polycrystal are twice as high as static results. (2) From the fractography, the cleavage steps are remarkably reduced in the SHPB test compared with the static test.


Split Hopkinson Pressure Bar;Fe-6.5wt%Si;Floating Zone Method;Polycrystal;Single Crystal;Fractography


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