论文标题
Al含量对双核的临界剪切应力和MG合金生长的影响
Effect of Al content on the critical resolved shear stress for twin nucleation and growth in Mg alloys
论文作者
论文摘要
通过固体溶液中Al原子对双成核和生长的临界分辨剪应力的影响通过扩散夫妇的结合与以微柱为导向的微柱相结合，以进行双胞胎。双核的临界剪切应力高于双生长的临界剪切应力，并且与Al含量相同的量增加。然而，对于4％的4％，增加的增加（大约为10 mpa），但较大（最大60-70 mpa），为9 at。％al。这些结果与基于稀释状态的第一原理计算（<5 at。％al）的Labusch模型一致[51]。与文献中最新数据的比较表明，与基底滑动相比，Al原子在增加双胞胎成核和生长的临界剪切应力方面更有效[21]。最后，沿着[0001]以微柱为导向的微骨的压缩试验显示，锥体滑移的临界剪切应力随着Al含量从98 MPa的纯Mg中的98 MPa迅速增加，至mg-9的250 MPa。因此，添加Al增加了MG合金的塑性各向异性。
The effect of Al atoms in solid solution on the critical resolved shear stress for twin nucleation and growth was analyzed by means of the combination of diffusion couples with compression tests in micropillars oriented for twinning. The critical resolved shear stress for twin nucleation was higher than that for twin growth and both increased by the same amount with the Al content. Nevertheless, the increase was small ( approx. 10 MPa) for 4 at.%Al but large (up to 60-70 MPa) for 9 at.%Al. These results were in agreement with Labusch-models based on first principles calculations in the dilute regime (< 5 at.%Al) [51]. Comparison with recent data in the literature showed that Al atoms are more effective in increasing the critical resolved shear stresses for twin nucleation and growth than for basal slip [21]. Finally, compression tests in micropillars oriented along [0001] showed the critical shear stress for pyramidal slip increased rapidly with the Al content from 98 MPa in pure Mg to 250 MPa in Mg-9 at.%Al. Thus, the addition of Al increased the plastic anisotropy of Mg alloys.
