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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2020.1
- 수록면
- 641 - 649 (9page)
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This study investigated the influence of the initial grain size on the plastic deformation and tunnel defects that occurredfrom friction stir welding of CoCrFeMnNi high entropy alloys (HEAs). The rolled and cast HEAs had a grain size of 2.8and 308 μm, respectively. After friction stir welding, the cast HEA weld had a grain size of 1.8 μm, which was coarser thanthat of the rolled HEA weld (1.4 μm). Therefore, the dynamic recrystallization ratios were 60.7 and 99.6% for the rolled andcast HEAs, respectively. The cast HEA weld with a large grain size contained a higher density of high-angle boundaries andtwins than the rolled HEA weld with the small grain size. The cast HEA had a larger resistance to plastic deformation owingto the larger fraction of Σ3 twin boundaries than the rolled HEA during friction stirring. This was associated with the highstrain hardening rate during tensile testing and to the significant amount of W dissolved from the stirring tool in the castHEA weld. Thus, the cast HEA weld had a higher tunnel defects ratio than the rolled HEA weld. The total unbonded ratiosof the rolled and cast HEA welds were 0.2 and 7.2%, respectively, indicating that the rolled HEA had better weldability thanthe cast HEA.
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