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研究了0~1.4T的直流磁场对AZ91D镁合金凝固组织和力学性能的影响。结果表明,随着磁感应强度的增加,由于MHD和TEMHD效应,合金的初生相和第二相先细化后粗化,其转折点均为0.84T;随着磁感应强度的增加,由于晶面磁化率的不同,α-Mg基体在(101)晶面的衍射峰强度减弱,在(102)、(100)和(110)晶面显著增强。直流磁场处理后,合金的综合力学性能得到了改善;当磁感应强度为1.40T时,合金的抗拉强度和伸长率较无磁场处理时分别提高了86%和28%。
The effects of DC magnetic field of 0 ~ 1.4T on the microstructure and mechanical properties of AZ91D magnesium alloy were studied. The results show that with the increase of magnetic induction, due to the MHD and TEMHD effects, the primary phase and the second phase of the alloy are refined and then roughened. The turning points of the alloy are both 0.84T. With the increase of the magnetic induction, The intensity of the diffraction peak of the α-Mg matrix in the (101) crystal plane is weakened, and the (100) and (110) crystal planes are significantly enhanced. After DC magnetic field treatment, the mechanical properties of the alloy have been improved. When the magnetic induction intensity is 1.40T, the tensile strength and elongation of the alloy increase by 86% and 28% respectively compared with those without magnetic field treatment.