直流磁场对AZ31镁合金凝固组织和力学性能的影响

Effect of DC Magnetic Field on Solidified Structure and Mechanical Properties of AZ31 Magnesium Alloy

研究了0~0.84 T的直流磁场对AZ31镁合金凝固组织和力学性能的影响。结果表明随着磁场强度的增加,合金的初生相和第二相均先细化后粗化,转折点为0.28T;在直流磁场作用下,琢-Mg基体在（0002）面的衍射峰强度减弱,在（1120）、（1122）和（1010）面的衍射峰强度显著增强;在直流磁场的作用下,合金的抗拉强度下降,但伸长率明显提高;当磁场强度为0.28 T时,伸长率最高为11.32%,与未处理时相比,提高了141.9%,同时抗拉强度下降最小。

The influence of different strengths （0-0.84T） of DC magnetic field on solidified structure and mechanical properties of AZ31 magnesium alloy was studied. The results show that with the increase of strength of magnetic field, primary phase and the second phase of the alloy decrease at first, and then coarsen. The turning point is 0.28T. The diffraction intensity of crystal plane of α-Mg matrix is weakened, and the diffraction intensity of crystal plane （1120）, （1122）, and （1010） are enhanced significantly under DC magnetic field. Tensile strength of AZ31 magnesium alloy is decreased, but its elongation is increased obviously under DC magnetic field. When the strength of magnetic field is 0.28T, the elongation of the alloy is 11.32%, which is increased by up to 141.9%, compared with the sample without DC magnetic field treatment. At the same time, the decrease of tensile strength of the alloy is the least.