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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.1
- 수록면
- 283 - 289 (7page)
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초록· 키워드
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Effects of initial twins on dynamic torsional properties of extruded AZ31 alloy were investigated by introducing {10–12}twins into it through precompression to 3 and 6% strains along the extrusion direction and performing torsional testing at astrain rate of 1.4 × 103 s−1 using a torsional Kolsky bar system. The as-extruded sample without twins showed higher dynamictorsional properties than the precompressed samples with many initial twins; the maximum shear strength and fracture shearstrain decreased with increasing amount of initial twins. In the as-extruded sample, twinning occurred vigorously throughoutthe gage section of the tubular specimen during high-strain-rate torsional tests, resulting in heavily deformed morphology,many macrocracks, and rough fractured surfaces. The increased amount of initial twins suppressed the twinning behaviorand localized the applied torsional deformation; this resulted in an almost unchanged sample shape, no secondary cracks,and a flat fracture plane, thereby deteriorating the dynamic torsional properties of the extruded alloy.
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