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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Nd on Hot Tearing Susceptibility and Mechanism of Mg-Zn-Y-Zr Alloys
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Influence of Nd on Hot Tearing Susceptibility and Mechanism of Mg-Zn-Y-Zr Alloys

机译：ND对Mg-Zn-Y-Zr合金热撕裂敏感性及机理的影响

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摘要

The influence of Nd on the hot tearing susceptibility(HTS) of Mg-4.5Zn-1Y-xNd-0.5Zr (x = 0, 1, 2, 3 wt.%) alloy was systematically studied by using Clyne-Davies model, the Newton baseline method based on the thermal analysis and the "T" hot tearing die with temperature and force testing system. The HTS of the alloy decreased first and then increased with Nd content increase, reaching the minimum value at the Nd content of 2 wt.%. Based on the results of thermal analysis, the solidification path of multi-component alloy was studied, and the evolution of phase precipitation and microstructure was discussed by SEM, EBD and TEM. It was found that the precipitation ofW-phase, which has a relatively high precipitation temperature and a certain coherent relationship with the parent phase, and reduced the intergranular hot tearing tendency. The results show that with the increase in Nd content to 2 wt.%, the decrease in HTS was due to alpha-Mg grain refinement, and the entry of Nd atoms into phaseIand phaseW, so that the ratio of phaseIwith low melting point to phaseWdecreases. When the content reaches 3 wt.%, the reason of HTS decrease was alpha-Mg grain turn to coarsening and the appearance of anotherT-phase with much lower melting point thanW-phase, i.e., ternary (MgZn)(92)Nd(8)phase. It was considered that the smooth feeding channels caused by fine and uniform alpha-Mg grains and the high grain boundary bridging strength from the higher precipitation temperature ofW-phase with a certain crystallographic relationship to the matrix leads to the lowest HTS of the Mg-4.5Zn-1Y-2Nd-0.5Zr alloy.
机译：采用Clyne-Davies模型、基于热分析的牛顿基线法和带有温度和力测试系统的“T”型热裂模具，系统研究了Nd对Mg-4.5Zn-1Y-xNd-0.5Zr（x=0,1,2,3 wt.%）合金热裂敏感性的影响。随着Nd含量的增加，合金的高温持久性先降低后升高，在Nd含量为2wt.%时达到最小值。根据热分析结果，研究了多元合金的凝固路径，并通过SEM、EBD和TEM讨论了相析出和组织的演变。发现W相的析出降低了沿晶热裂倾向，W相的析出温度相对较高，与母相有一定的相干关系。结果表明，随着Nd含量增加到2 wt.%，高温超导的降低是由于α-Mg晶粒细化，Nd原子进入PhaseI和phaseW，因此低熔点的PhaseI与phaseW的比率降低。当含量达到3 wt.%时，高温超导性能下降的原因是α-Mg晶粒变粗，并出现另一个熔点远低于w相的相，即（MgZn）（92）Nd（8）三元相。研究认为，由于α-Mg晶粒细小而均匀，晶界桥连强度较高（W相的沉淀温度较高，与基体有一定的晶体学关系），因此Mg-4.5Zn-1Y-2Nd-0.5Zr合金的高温超导性能最低。

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