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首页> 外文期刊>Materials Science and Engineering >Comparison of the effects of La- and Ce-rich rare earth additions on the microstructure, creep resistance, and high-temperature mechanical properties of Mg-6Zn-3Cu cast alloy
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Comparison of the effects of La- and Ce-rich rare earth additions on the microstructure, creep resistance, and high-temperature mechanical properties of Mg-6Zn-3Cu cast alloy

机译：比较富镧和铈的稀土元素对Mg-6Zn-3Cu铸造合金的组织，抗蠕变性和高温力学性能的影响

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摘要

The effect of 1 wt.% La- and Ce-rich rare earth (RE) additions on the microstructure, creep resistance, and high temperature mechanical properties of the Mg-6Zn-3Cu alloy (ZC63) was investigated by impression creep and shear punch tests (SPT). Impression creep tests were performed in the temperature range 423-498 K and under punching stress in the range 150-700 MPa for dwell times up to 3600 s. The ultimate shear strength (USS) was measured by the SPT in the temperature range 298-498 K. The results showed that Ce-rich RE was more effective than the La-rich RE in refining the as-cast microstructure, increasing the number density of eutectic phases at grain boundaries, and producing thermally stable Mg_(12)RE and MgRE compounds. The creep strength of the base alloy was remarkably improved by addition of both types of RE elements, although the Ce-rich RE-containing alloy showed better creep resistance. The addition of La-rich RE increased the shear strength of the base alloy, whereas Ce-rich RE addition had detrimental effects on the shear strength. This was attributed to the formation of a grain boundary network of Mg(Zn,Cu) Laves phases in Ce-rich RE-containing alloy. This grain boundary network with a bulky morphology promoted the initiation and propagation of cracks, leading to an adverse effect on the strength. This was in contrast with its positive influence on inhibiting grain boundary sliding and migration, which enhanced the creep strength of the alloy.
机译：通过压痕蠕变和剪切冲头研究了添加1 wt％的富La和Ce的稀土（RE）对Mg-6Zn-3Cu合金（ZC63）的组织，抗蠕变性和高温力学性能的影响。测试（SPT）。在423-498 K的温度范围内，在150-700 MPa的冲压应力下进行了3600 s的保压时间的压痕蠕变测试。 SPT在298-498 K的温度范围内测量了极限剪切强度（USS）。结果表明，富Ce的稀土在富集铸态组织方面比富La的稀土更有效，从而增加了密度在晶界处形成共晶相，并产生热稳定的Mg_（12）RE和MgRE化合物。两种稀土元素的添加都显着提高了基体合金的蠕变强度，尽管富含铈的含稀土的合金表现出更好的抗蠕变性。富镧稀土的添加增加了基体合金的剪切强度，而富铈稀土的添加对剪切强度产生了不利影响。这归因于富含铈的含稀土合金中Mg（Zn，Cu）Laves相的晶界网络的形成。这种具有大体积形态的晶界网络促进了裂纹的萌生和扩展，从而对强度产生了不利影响。与此相反，它对抑制晶界滑动和迁移具有积极的影响，从而增强了合金的蠕变强度。

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