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Effects of Sn on defect structures in high-speed deformed Ni-Sn alloy

机译：Sn对高速变形Ni-Sn合金中缺陷组织的影响

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摘要

Defect structures in compressed and fractured pure Ni and Ni-2at%Sn alloy were investigated. The dislocation cell size of high-speed compressed Ni was smaller than that of low-speed compressed Ni. In Ni-Sn, the cell structure was small and independent of compression speed. The effect of solute Sn was very strong, and Sn trapped a high density of dislocations. At the saw-tooth-like fracture tips formed by high-speed elongation, the observed dislocation density was low in both metals, but was lower in Ni than in Ni-Sn. The number of stacking fault tetrahedra (SFTs) formed at the tips was almost the same in Ni as in Ni-Sn. Because the density of the dislocations was very low despite the strong effect of solute Sn, and because the density of formed SFTs was almost the same in both metals at the saw-tooth-like frac ture tips, the formation of SFTs likely involves a dislocation-free mechanism during high-speed deformation.
机译：研究了压缩和断裂的纯Ni和Ni-2at％Sn合金的缺陷组织。高速压缩Ni的位错晶胞尺寸小于低速压缩Ni的位错晶胞尺寸。在Ni-Sn中，电池结构很小，并且与压缩速度无关。溶质Sn的作用非常强，并且Sn捕获了高密度的位错。在由高速延伸形成的锯齿状断裂尖端处，观察到的位错密度在两种金属中均较低，但在Ni中比在Ni-Sn中更低。 Ni中的尖端处形成的堆垛层错四面体（SFT）的数量与Ni-Sn中的数量几乎相同。尽管固溶Sn的作用很强，但由于位错的密度非常低，并且由于两种金属在锯齿状裂纹尖端处形成的SFT的密度几乎相同，因此SFT的形成可能涉及位错高速变形时没有机械装置。

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