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首页> 外文期刊>Materials Science and Engineering >Effect of substitution of Zn with Ni on microstructure evolution and mechanical properties of LPSO dominant Mg-Y-Zn alloys
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Effect of substitution of Zn with Ni on microstructure evolution and mechanical properties of LPSO dominant Mg-Y-Zn alloys

机译：Zn替代Ni对LPSO主导的Mg-Y-Zn合金组织和力学性能的影响。

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摘要

The microstructures and mechanical properties of Mg_(96)Y_2Zn_2 (MYZ), Mg_(96)Y_2Zn_1Ni_1 (MYZN), and Mg_(96)Y_2Ni_2 (MYN) (at.%) alloys have been systematically examined in this study. The as-cast alloys contain α-Mg matrix, long-period stacking order (LPSO) phase and compounds. By substituting Zn with Ni, the volume fractions of the LPSO phase and compounds increase gradually, leading to higher yield strength and poorer ductility of the as-cast alloys. Moreover, the morphology of the LPSO phase transform from block to lamella gradually. After ho-mogenization at 500 ℃ for 12 h, the fraction of the LPSO phase increase and compounds decrease, moreover, the morphologies of the LPSO phase remain unchanged. Tensile tests indicate that the yield strengths of the extruded MYZ, MYZN, and MYN alloys are 325, 340, and 385 MPa, respectively; the increase can be explained by the higher fraction of the LPSO phase and different stress-withstanding capacity of the LPSO phase with different morphologies. In addition, the enhancement of strength is accompanied by slight drop in ductility.
机译：Mg_（96）Y_2Zn_2（MYZ），Mg_（96）Y_2Zn_1Ni_1（MYZN）和Mg_（96）Y_2Ni_2（MYN）（at。％）合金的微观结构和力学性能已在本研究中进行了系统地研究。铸态合金包含α-Mg基体，长期堆积顺序（LPSO）相和化合物。通过用Ni替代Zn，LPSO相和化合物的体积分数逐渐增加，导致铸态合金的屈服强度更高和延展性较差。此外，LPSO相的形态逐渐从块状转变为薄层。在500℃均质12h后，LPSO相的比例增加，化合物减少，而且LPSO相的形态保持不变。拉伸试验表明，挤压后的MYZ，MYZN和MYN合金的屈服强度分别为325、340和385 MPa。可以用更高比例的LPSO相和不同形态的LPSO相的不同耐压能力来解释这种增加。另外，强度的提高伴随着延展性的轻微下降。

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