The effect of alloy composition on the microstructure and tensile properties of binary Mg-rare earth alloys
The effect of alloy composition on the microstructure and tensile properties of binary Mg-rare earth alloys
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DOI：
10.1016/j.intermet.2008.12.009
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发表时间：
2009-07-01
期刊：
影响因子：
4.4
通讯作者：
Nie, J. F.
中科院分区：
文献类型：
--
作者：
Chia, T. L.;Easton, M. A.;Nie, J. F.
将La、Ce和Nd添加到商业纯Mg中，使其接近5重量%。共晶中形成的金属间化合物分别为Mg（12）La、Mg（12）Ce和Mg（3）Nd。Scheil-Gulliver方程的预测与测得的体积分数相当好。随着各合金中金属间相含量的增加，合金的屈服强度增加，断裂伸长率降低。机械性能的变化率也被发现取决于金属间化合物的类型，Mg（3）Nd比Mg（12）RE更有影响。的共晶的形态特征和预测相体积分数的基础上进行比较。与这些预测有一些差异，这可能是由于高压压铸中快速冷却速率导致的高过冷度。(C)2009爱思唯尔有限公司保留所有权利。
Additions of La, Ce and Nd to commercially pure Mg were made up to similar to 5 wt.%. It was found that the intermetallic phases formed in the eutectic were Mg(12)La, Mg(12)Ce and Mg(3)Nd respectively. Predictions from the Scheil-Gulliver equation correlated reasonably well with the measured volume fractions. The yield strength increased and the elongation to fracture decreased with an increase in the amount of intermetallic phase present in each alloy. The rate of change in mechanical properties was also found to be dependent upon the type of intermetallic, With Mg(3)Nd being more influential than Mg(12)RE. The morphology of the eutectics was also characterised and compared with the predictions based on phase volume fraction. There were some variations from those predictions, which may be due to the high undercooling produced as a result of the fast cooling rates in high pressure die casting. (C) 2009 Elsevier Ltd. All rights reserved.