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首页> 外文期刊>Materials Science and Engineering >Deformation twinning in vanadium single crystals tested in compression at 77 K
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Deformation twinning in vanadium single crystals tested in compression at 77 K

机译：在77 K压缩下测试的钒单晶中的形变孪晶

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Vanadium is the least studied non-magnetic body centered cubic metal whose mechanism of plastic deformation is still a subject of controversy. Depending on the level of purity and spatial distribution of interstitial impurities, it has been shown to deform by anomalous slip on the low-stressed(01̅1)plane or by twinning along {112} planes in the〈111〉direction. In order to resolve this controversy, we test high-purity vanadium single crystals of four orientations at 77 K under a low strain rate to 1–2% of the plastic strain. All our samples contain spatially homogeneous distribution of impurities and deform predominantly by twinning on two{112}⟨111⟩systems in which the {112} planes are sheared in the twinning sense. The secondary surface markings correspond to slip on{110}⟨111⟩systems with the highest Schmid factors, whereas weak(01̅1)slip is found mostly in the vicinity of twins. These results support the argument made previously by Thompson and Carlson (1965) that a spatially homogenenous distribution of interstitial impurities in high purity vanadium single crystals leads to predominant twinning.
机译：钒是研究最少的以非磁体为中心的立方金属，其塑性变形机理仍是一个有争议的话题。根据间隙杂质的纯度和空间分布水平，已表明它会因低应力（01̅1）平面上的异常滑动或沿by111〈方向沿{112}平面孪生而变形。为了解决这一争议，我们在低应变率至塑性应变的1-2％的情况下，以77 K测试了四个取向的高纯度钒单晶。我们所有的样本都包含杂质在空间上的均匀分布，并且主要通过在两个{112}⟨111⟩系统上孪生而变形，在该两个系统中，{112}平面在孪生意义上被剪切。次表面标记对应于具有最高Schmid因子的{110}⟨111⟩系统的滑移，而弱（01（1）滑移主要出现在双胞胎附近。这些结果支持了汤普森和卡尔森（Thompson and Carlson，1965）先前提出的论点，即高纯钒单晶中间隙杂质在空间上的均匀分布会导致主要的孪晶现象。

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