论文成果
Formation mechanism of fivefold deformation twins in a face-centered cubic alloy
- 点击次数：
- 论文类型：期刊论文
- 发表时间：2017-03-28
- 发表刊物：SCIENTIFIC REPORTS
- 收录刊物：SCIE、PubMed
- 文献类型：J
- 卷号：7
- 页面范围：45405
- ISSN号：2045-2322
- 摘要：The formation mechanism considers fivefold deformation twins originating from the grain boundaries in a nanocrystalline material, resulting in that fivefold deformation twins derived from a single crystal have not been reported by molecular dynamics simulations. In this study, fivefold deformation twins are observed in a single crystal of face-centered cubic (fcc) alloy. A new formation mechanism is proposed for fivefold deformation twins in a single crystal. A partial dislocation is emitted from the incoherent twin boundaries (ITBs) with high energy, generating a stacking fault along {111} plane, and resulting in the nucleating and growing of a twin by the successive emission of partials. A node is fixed at the intersecting center of the four different slip {111} planes. With increasing stress under the indentation, ITBs come into being close to the node, leading to the emission of a partial from the node. This generates a stacking fault along a {111} plane, nucleating and growing a twin by the continuous emission of the partials. This process repeats until the formation of fivefold deformation twins.
