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냉간 압연 시 Ta-10W 합금의 미세조직 변화 및 슬립 거동에 미치는 압하율의 영향
박기성,Lalit Kaushik,유효상,전재열,최시훈 대한금속·재료학회 2024 대한금속·재료학회지 Vol.62 No.6
In this study, we investigated the influence of cold rolling reduction on microstructural evolution andslip behavior in Ta-10W alloy fabricated by vacuum arc melting (VAM). As the reduction increased, both singleand multiple slips were observed within some grain interiors. At reductions of 20% and 40%, deformation bands,primarily consisting of γ-fiber components, formed within the grain interiors. The fraction of deformation bands(DBs) increased with higher reduction. Conversely, at 60% reduction, in addition to DBs, experimentallyobserved shear bands (SBs) with a herringbone pattern were formed. Both DBs and SBs predominantly formedin regions of concentrated strain (areas with high kernel average misorientation (KAM) and geometricallynecessary dislocations (GND)). As the reduction increased, the misorientation angle between the matrix andthe DBs or SBs gradually increased, while the width of the DBs decreased. To investigate the violation ofSchmid’s law in Ta-10W alloy, slip trace and resolved shear stress (RSS) analyses were performed on observedslip lines within deformed grains. Contrary to conventional slips, where slip typically occurs on the plane withthe highest RSS, slips in the Ta-10W alloy were confirmed to occur even on planes with lower RSS in certaingrains. Hence, this study provides experimental evidence of Schmid’s law violation in Ta-10W alloy