Zhang Shuo, Song Jiangfeng, Liao Hongxin, Liu Yanglu, Zhang Gen, Ma Shida, Tang Aitao, Atrens Andrej, Pan Fusheng
National Engineering Research Center for Magnesium Alloy, Chongqing University, Chongqing 400045, China.
The First Sub-Institute of Nuclear Power Institute of China, Chengdu 610213, China.
Materials (Basel). 2019 Apr 3;12(7):1100. doi: 10.3390/ma12071100.
The effect of B addition on the microstructure and mechanical properties of AM50 was investigated, and the mechanism of grain refinement was clarified. Optical microscopy, X-ray diffraction, scanning electron microscopy, and electron probe microanalysis were used to characterize the microstructure evolution. The grain size of as-cast AM50 decreased from 550 μm to 100 μm with the B content increasing from 0 to 0.15 wt.%. AlB₂ particles in the Al-3B master alloy transformed to Mg-B, and acted as the grain refiner. The addition of B to as cast AM50 alloy results in improved mechanical properties of AM50 + xB alloys. For instance, the YTS (yield tensile strength), UTS (ultimate tensile strength), and elongation of as cast AM50 + 0.15 wt.% B alloy was 94 MPa, 215 MPa, and 12.3%.
研究了硼添加对AM50微观结构和力学性能的影响，并阐明了晶粒细化的机制。采用光学显微镜、X射线衍射、扫描电子显微镜和电子探针微分析来表征微观结构的演变。随着硼含量从0增加到0.15 wt.%，铸态AM50的晶粒尺寸从550μm减小到100μm。Al-3B中间合金中的AlB₂颗粒转变为Mg-B，并起到晶粒细化剂的作用。向铸态AM50合金中添加硼可改善AM50 + xB合金的力学性能。例如，铸态AM50 + 0.15 wt.% B合金的屈服抗拉强度（YTS）、极限抗拉强度（UTS）和伸长率分别为94MPa、215MPa和12.3%。
