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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 1,448 - 1,456 (9page)
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This paper reports the mechanical properties and formability under biaxial stretching in pure tantalum as a function ofaverage grain size. The grain size of pure tantalum was adjusted from submicron to tens of micron using the high-pressuretorsion process and subsequent annealing. The stretch formability was evaluated using a miniaturized Erichsen tester. Underuniaxial tension, the mechanical properties of pure tantalum followed the typical strength-ductility trade-off behavior accordingto the average grain size. Nevertheless, the stretch formability became rather significantly inferior in the coarse-graintantalum, which was primarily attributed to the poor resistance to strain localization and limited work hardening capacity. This deterioration was supposed to be due to the intensified strain localization with increasing the average grain size, basedon the in-grain deformation heterogeneity within individual grains and the surface roughening after the Erichsen test. Consequently,this study suggests that the excellent stretch formability and work hardening capacity under biaxial loading canbe achieved at a certain range of the average grain size (8.25–19.3 μm in this work).
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