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Lixin Hong, Rongxiang Wang, and Xiaobo Zhang, Effects of Nd on microstructure and mechanical properties of as-cast Mg–12Gd–2Zn–xNd–0.4Zr alloys with stacking faults, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp.1570-1577. https://dx.doi.org/10.1007/s12613-021-2264-8
Lixin Hong, Rongxiang Wang, and Xiaobo Zhang, Effects of Nd on microstructure and mechanical properties of as-cast Mg–12Gd–2Zn–xNd–0.4Zr alloys with stacking faults, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp.1570-1577. https://dx.doi.org/10.1007/s12613-021-2264-8
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Nd对含堆垛层错的铸态Mg–12Gd–2Zn–xNd–0.4Zr合金组织和力学性能的影响

摘要: 镁合金以其高比强度、高比刚度、低密度等优点在航空航天、交通运输等领域显示出越来越大的潜力。但在实际使用过程中，镁合金仍存在塑性差、绝对屈服强度偏低、拉压不对称等问题。为了研究稀土元素Nd对镁合金显微组织和力学性能的影响与强化机制，本文以Mg–12Gd–2Zn–xNd–0.4Zr合金为研究对象，分别添加0, 0.5wt%, 1wt%的Nd元素。通过光学显微镜、扫描电镜、能谱仪、透射电镜和XRD研究Nd对Mg–12Gd–2Zn–xNd–0.4Zr合金显微组织的影响，通过拉伸试验机、纳米压痕仪和显微硬度计测试了合金的力学性能。结果表明：显微组织主要由α–Mg基体、共晶相和堆垛层错(SFs)组成；Nd的加入对晶粒细化和组织均匀化起着重要作用。随着Nd添加量的增加，合金的拉伸屈服强度和显微硬度增加，压缩屈服强度降低，导致合金的反向拉压不对称性减弱。当Nd含量为1wt%时，合金的力学性能最好，其抗拉强度和抗压强度分别达到194 MPa和397 MPa，压缩屈服强度和拉伸屈服强度比值降低为1.05。

 

Effects of Nd on microstructure and mechanical properties of as-cast Mg–12Gd–2Zn–xNd–0.4Zr alloys with stacking faults

Abstract: In order to study the effects of Nd addition on microstructure and mechanical properties of Mg–Gd–Zn–Zr alloys, the microstructure and mechanical properties of the as-cast Mg–12Gd–2Zn–xNd–0.4Zr (x = 0, 0.5wt%, and 1wt%) alloys were investigated by using optical microscope, scanning electron microscope, X-ray diffractometer, nano indentation tester, microhardness tester, and tensile testing machine. The results show that the microstructures mainly consist of α-Mg matrix, eutectic phase, and stacking faults. The addition of Nd plays a significant role in grain refinement and uniform microstructure. The tensile yield strength and microhardness increase but the compression yield strength decreases with increasing Nd addition, leading to weakening tension–compression yield asymmetry in reverse of the Mg–12Gd–2Zn–xNd–0.4Zr alloys. The highest ultimate tensile strength (194 MPa) and ultimate compression strength (397 MPa) are obtained with 1wt% Nd addition of the alloy.

 

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