Research Progress of Mg-Al Based Alloys Containing Gd Element
ZHONG Shiyu1,2, ZHANG Dingfei1,2,*, XU Junyao1,2, ZHAO Yang1,2, FENG Jingkai1,2, JIANG Bin1,2, PAN Fusheng1,2, YANG Jingbo3
1 College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China 2 National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China 3 HBIS Group Technology Research Institute, Shijiazhuang 050023, China
Abstract: As an environmentally friendly engineering material in the 21st century, magnesium alloys show a great application prospect. Among various magnesium alloys, Mg-Al based magnesium alloys are the most widely used at present. Alloying has always been a significant method to improve the properties of magnesium alloys. In many studies about Mg-Al based alloys, the addition of rare earth element Gd is an important research direction. In recent years, many researchers have carried out extensive studies on the microstructure, mechanical properties and corrosion behavior of Mg-Al-Gd alloys. In fact, when Gd is added to Mg-Al based alloys, the type and structure of the second phase would change with different Gd content. The most common one is the transformation from brittle second phase Mg17Al12 to high hardness second phase Al2Gd. The latter could act as a heterogeneous nucleation point during solidification. Additionally, it is thermally stable and would not dissolve or decompose in the subsequent heat treatment and hot working process. In other words, Al2Gd could increase the nucleation rate, pin the grain boundary and restrain the abnormal grain growth. As a result, the grain size of the alloy is obviously refined and the mechanical properties are improved (fine grain strengt-hening). In 2011, some scholars found LPSO phase in Mg-Al based alloys containing Gd for the first time. However, compared with Mg-Zn alloy, the research on LPSO in Mg-Al based alloys is still relatively rare, and the strengthening effect of LPSO phase has not been fully utilized. Generally, Gd can improve the mechanical properties of as-cast Mg-Al based alloys. But its effect on those of Mg-Al based alloys which subjected to heat treatment and/or hot deformation are more complex. Hence, further works are supposed to be carried out. In terms of corrosion behavior, the addition of Gd can reduce the segregation of harmful impurity elements such as Cu, Fe, Ni at the grain boundary. Besides, a much denser corrosion film could be achieved by adding Gd. Furthermore, the composition, content, morphology and distribution of the second phase are modified with Gd addition, leading to the change of potential difference between the second phase and the substrate, and the variation of shielding effect of the second phase. As a result, the corrosion behavior of the alloy is affected. In this paper, the research progress of Mg-Al based alloy containing Gd at home and abroad is reviewed. The effects of Gd on the microstructure, mechanical properties and corrosion behavior of Mg-Al based alloys are introduced, and the shortcomings of the current research are analyzed. Finally, the research trend of Mg-Al based alloys containing Gd is prospected.
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