The microstructure and creep characteristics of cast Mg-4Zn-0.5Ca and Mg-4Zn-0.5Ca-2RE alloys
The microstructure and creep characteristics of cast Mg-4Zn-0.5Ca and Mg-4Zn-0.5Ca-2RE alloys
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DOI：
10.1016/j.msea.2014.05.043
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发表时间：
2014-07-29
期刊：
影响因子：
6.4
通讯作者：
Mahmudi, R.
中科院分区：
文献类型：
--
作者：
Naghdi, F.;Mahmudi, R.
通过压痕蠕变试验，研究了添加2wt%富Ce稀土（RE）对Mg-4 Zn-0.5Ca（wt%）合金显微组织和蠕变行为的影响。试验温度为423-498 K，应力为250-800 MPa，停留时间为3600 s。结果表明，稀土的加入显著提高了合金的抗蠕变性能.热稳定的（MgZn）（12）RE和Mg 17 RE 2颗粒的形成是这种改善的原因。蠕变行为可以分为两个应力区，根据试验温度，从低应力区到高应力区发生变化，约为0.024 <（sigma/G）< 0.038和0.031 <（sigma/G）。
The effect of 2 wt% Ce-rich rare earth (RE) addition on the microstructure and creep behavior of the Mg-4Zn-0.5Ca (wt%) alloy was investigated by impression creep tests in the temperature range of 423-498 K and under stresses in the range of 250-800 MPa for dwell times up to 3600 s. Addition of RE was shown to significantly improve the creep resistance of the base alloy. Formation of the thermally stable (MgZn)(12)RE and Mg17RE2 particles was responsible for such an improvement. The creep behavior can be divided into two stress regimes, with a change from the low-stress regime to the high-stress regime occurring, depending on the test temperature, around 0.024 < (sigma/G) < 0.038 and 0.031 < (sigma/G)