Seth Prem Prakash, Parkash Om, Kumar Devendra
Department of Ceramic Engineering, Indian Institute of Technology (BHU) Varanasi 221005 India
RSC Adv. 2020 Oct 8;10(61):37327-37345. doi: 10.1039/d0ra02744h. eCollection 2020 Oct 7.
The demand for lightweight, high specific strength alloys has drastically increased in the last two decades. Magnesium and aluminum alloys are very suitable candidate materials. Research on alloys with an MgSi phase started about three decades ago. The current scenario is that magnesium and aluminum alloys containing an MgSi phase are very popular in the scientific community and extensively used in the automotive and aerospace industries. MgSi is a very stable phase and exhibits excellent mechanical, thermal, electrochemical and tribological properties. This paper presents a brief review of Mg-Si binary alloys, and Mg-Si-Al and Al-Si-Mg alloys. Grain refinement methods and mechanical properties have been reported on lightweight alloys containing Mg and Si. The available results show that silicon reacts with magnesium and forms an intermetallic compound with the stoichiometric formula MgSi. There is formation of an MgSi phase in Mg-Si, Mg-Si-Al and Al-Mg-Si alloys by the diffusion or precipitation process. The morphology and size of an developed MgSi phase depend on the synthesis route and base metal or matrix. In the liquid metallurgy process the precipitation sequence depends on the cooling rate. The morphology of the MgSi phase depends on the precipitation sequence and the mechanical properties depend on the morphology and size of the MgSi phase within the alloy matrix.
在过去二十年中，对轻质、高比强度合金的需求急剧增加。镁合金和铝合金是非常合适的候选材料。对含MgSi相合金的研究大约始于三十年前。目前的情况是，含MgSi相的镁合金和铝合金在科学界非常受欢迎，并广泛应用于汽车和航空航天工业。MgSi是一种非常稳定的相，具有优异的力学、热学、电化学和摩擦学性能。本文简要综述了Mg-Si二元合金以及Mg-Si-Al和Al-Si-Mg合金。已报道了含Mg和Si的轻质合金的晶粒细化方法和力学性能。现有结果表明，硅与镁反应形成化学计量式为MgSi的金属间化合物。通过扩散或沉淀过程，在Mg-Si、Mg-Si-Al和Al-Mg-Si合金中形成MgSi相。所形成的MgSi相的形态和尺寸取决于合成路线以及基体金属或基体。在液态冶金过程中，沉淀顺序取决于冷却速率。MgSi相的形态取决于沉淀顺序，而力学性能取决于合金基体中MgSi相的形态和尺寸。
