Research Progress of Micro Amount of Boron Addition on Microstructure and Properties of Magnesium Alloy
ZHANG Shuo1, SONG Jiangfeng1, PAN Fusheng1,2, LIU Qiang1, YANG Li1
1 National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044; 2 Chongqing Academy of Science and Technology, Chongqing 401123
Abstract: In twenty-first century, due to the over exploitation and utilization of resources such as oil and coal, people pay more and more attention to energy saving and emission reduction. Therefore, lightweight structural materials are attracting more and more attention. Magnesium alloy is the lightest structural metallic material with good damping properties, electromagnetic shielding, and high specific strength and stiffness. It shows great potential to be used in aerospace, 3C (computer, communication, consumer electronics) products, automotive and other fields. However, the comprehensive properties and corrosion properties of Mg alloys need to be further improved. Since grain refinement can enhance the strength and plasticity simultaneously, it is of great importance to develop an effective and low-cost grain refiner to further improve the comprehensive properties of magnesium alloys. The commonly used grain refiners for magnesium alloys are usually Zr, Si, rare-earth elements and carbon containing modifiers. The presence of Al highly deteriorates the grain refinement of Zr. Thus, the grain refined of Zr is limited to magnesium alloys contains no Al. The addition of a large amount of Si will generate coarse Mg2Si phase in the alloy, which reduce the mechanical properties, only a small amount of Si addition will reduce the corrosion resistance of magnesium alloy greatly. The high cost and high density of rare earth limited its application in magnesium alloy. Carbon inoculation usually has good grain refinement on most of the Mg-Al alloys, but some carbon compounds cause a series of environmental problems such as CCl4, C2Cl6 etc. The introduction of carbon will increase the corrosion rate of magnesium alloy. B is a light element with low density, high melting point and high corrosion resis-tance. It is usually used as inoculant and grain refiner in aluminum alloy. In recent years, many researchers have done in-depth research on B compounds, it is found that B will form compounds with most metals, and most of the compounds has close-packed hexagonal structure, which have strong affinity with magnesium alloys. So, B has a great potential to act as heterogeneous nucleation site and refine the grains of Mg alloys. However, up to the author’s best knowledge, no one has summarized the influence of B additions with different type on the microstructure and properties of magnesium alloys and the corresponding mechanism. In this paper, the experimental study on the addition of trace B in magnesium alloy structural materials has been summarized. The mechanism of grain refinement and strengthening of B in several Mg alloys are analyzed. Besides, the prospect of application of B in magnesium alloy is presented. It is considered that B is an element with great research and application value in the development of magnesium alloy, especially in the Al containing alloys.
张烁, 宋江凤, 潘复生, 刘强, 杨丽. 微量硼添加对镁合金组织和性能影响的研究进展[J]. 材料导报, 2018, 32(19): 3405-3413.
ZHANG Shuo, SONG Jiangfeng, PAN Fusheng, LIU Qiang, YANG Li. Research Progress of Micro Amount of Boron Addition on Microstructure and Properties of Magnesium Alloy. Materials Reports, 2018, 32(19): 3405-3413.
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2018, Vol. 32 
