摘要:
研究了铸态Mg-Sn-Si合金中Mg2(Si,Sn)复合相的结构、特性以及该相对Mg-Sn-Si合金变质作用的影响。结果表明： Sn原子能取代Mg2Si中的部分Si生成Mg2(Si,Sn)复合相,该三元相与Mg2Si, Mg2Sn相的结构相同,属于面心立方结构, Mg2(Si,Sn)相的元素含量并不固定,在Si富集区形成的Mg2(Si,Sn)相中, Si元素含量高,在Si贫乏区形成的Mg2(Si,Sn)相中, Si元素含量低。 Si含量较多的Mg2(Si,Sn)相性能与Mg2Si相接近, Sn含量较多的Mg2(Si,Sn)相性能与Mg2 Sn相接近,实验中发现Mg2(Si,Sn)复合相的纳米硬度、弹性模量与维氏硬度等物理性能介于Mg2Si与Mg2Sn之间, Mg2(Si,Sn)相对汉字状Mg2Si相的变质处理起到桥梁作用。
Abstract:
Microstructure, characteristic and metamorphism of Mg2(Si,Sn) compound phase are studied in as-cast Mg-Sn-Si alloy. The results indicate that Sn atom can replace the partial Si of Mg2Si then form Mg2(Si,Sn) compound phase, and structure of the ternary compound is the same as Mg2Si and Mg2Sn, all belong to face-centered cubic. The element content of Mg2(Si,Sn) phase is not invariable, the Mg2(Si,Sn) phase with high Si content is in Si enrichment region, while it with low Si content is in Si poverty region. The property of Mg2(Si,Sn) phase with high Si content is close to Mg2Si phase, the property of the phase with high Sn content is close to Mg2Sn phase. In experiments, the nano-hardness, elastic modulus, vickers hardness and other physical properties of Mg2(Si,Sn) phase are between Mg2Si phase and Mg2Sn phase, in the metamorphism process of Chinese-script-like Mg2Si phase, Mg2(Si,Sn) compound phase plays a role as a bridge.
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