Effect of segregated elements on the interactions between twin boundaries and screw dislocations in Mg
Effect of segregated elements on the interactions between twin boundaries and screw dislocations in Mg
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DOI：
10.1063/1.4926947
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发表时间：
2015-07
影响因子：
3.2
通讯作者：
Takashi Yoshida;M. Yuasa;M. Mabuchi;Y. Chino
中科院分区：
文献类型：
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作者：
Takashi Yoshida;M. Yuasa;M. Mabuchi;Y. Chino
利用分子动力学（MD）模拟了X （X = Sc， Y，或Nd）分隔的{101¯2}和{101¯1}孪晶界（TBs）与螺杆位错的相互作用。此外，还对纯Mg和Mg - y合金进行了力学试验。MD模拟结果表明，所有模型的位错均通过{101¯2}TB， Mg - x模型中传递的剪切应变大于纯Mg模型；其中Mg-Y模型的剪切应变最大。这与Y的加入增强了应变硬化的实验结果相对应。对于a{101¯1}TB的相互作用，一些分离的原子诱导TB发射位错，而另一些分离的原子锁定了TB吸收的位错。将{101¯1}TB的相互作用行为划分为5种模式。这种TB的相互作用可以用能量变化的判据来解释，也可以用{…
Interactions of { 101¯2} and { 101¯1} twin boundaries (TBs), segregated by X (X = Sc, Y, or Nd), with screw partial dislocations were simulated using molecular dynamics (MD). In addition, mechanical tests were carried out on pure Mg and Mg–Y alloy. The MD simulation results suggested that the dislocations passed through the { 101¯2} TB in all the models and that the shear strains for transmission in the Mg–X models were larger than that in the pure Mg model; in particular, the shear strain in the Mg–Y model was the largest. This corresponded to the experimental result that strain hardening was enhanced by Y addition. For interactions of a { 101¯1} TB, some segregated atoms induced the emission of dislocations from the TB, whereas other segregated atoms locked the dislocation absorbed in the TB. As a result, the interaction behaviors of the { 101¯1} TB were divided into five patterns. The interactions of this TB could be explained by the criterion of energy variations, as well as the interactions, of the {...