Formation, microstructure, and mechanical properties of in situ Mg-Ni-(Gd,Nd) bulk metallic glass composite
Formation, microstructure, and mechanical properties of in situ Mg-Ni-(Gd,Nd) bulk metallic glass composite
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DOI：
10.1557/jmr.2009.0438
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发表时间：
2009-12
影响因子：
2.7
通讯作者：
J. Yin;G. Yuan;Z. Chu;Jian Zhang;W. Ding
中科院分区：
文献类型：
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作者：
J. Yin;G. Yuan;Z. Chu;Jian Zhang;W. Ding
基于三元Mg_75Ni_15Gd_10金属玻璃前体，通过调整Mg和稀土（RE）元素的成分，开发了一种新型Mg_80Ni_12Gd_4Nd_4块状金属玻璃复合材料（BMGC）。该 BMGC 的抗压极限强度超过 900 MPa，总破坏应变为 4.3%，比强度为 3.12 × 10^5 Nm/kg。机械性能的提高归因于 Mg_80Ni_12Gd_4Nd_4 BMGC 中由 Mg 固溶体薄片和玻璃基体组成的“双相”结构。 BMGC 中均匀分散的 Mg 相增强体的特征是长周期有序结构 (LPOS)，具有与 6H 型理想六方晶格扭曲的六个密排平面的周期性阵列。复合材料中的 LPOS-Mg 可以充当软介质，捕获不稳定的剪切带或与不稳定的剪切带相互作用，从而产生塑性应变。本研究可为设计具有“双相”结构的 Mg-TM-RE 基（TM：过渡金属）BMGC 提供指导。
Based on a ternary Mg_75Ni_15Gd_10 metallic glass former, a new Mg_80Ni_12Gd_4Nd_4 bulk metallic glass composite (BMGC) was developed by tailoring the compositions of Mg and rare earth (RE) elements. This BMGC displayed compressive ultimate strength over 900 MPa with a total strain to failure of 4.3% and specific strength of 3.12 × 10^5 Nm/kg. The improved mechanical properties were attributed to a “dual phases” structure consisting of Mg solid solution flakes and glassy matrix in the Mg_80Ni_12Gd_4Nd_4 BMGC. The homogeneously dispersed Mg phases reinforcement in the BMGC were characterized as a long period ordered structure (LPOS) with periodic arrays of six close-packed planes distorted from the ideal hexagonal lattice of 6H-type. The LPOS-Mg in the composite can act as a soft media to trap or interact with the unstable shear bands and contribute to plastic strain. The present study may provide a guideline for designing the Mg–TM–RE-based (TM: transition metals) BMGCs with “dual phases” structures.