Sr对AZ91镁合金凝固组织和力学性能的影响

发布时间：2018-07-14 10:36

【摘要】：利用光学显微镜、X射线衍射仪和扫描电镜,研究了添加0.05%~0.25%Sr对AZ91镁合金凝固组织和力学性能的影响。结果表明:加入微量Sr后,合金的初生相粗化。随着Sr加入量的增加,初生相的形貌尺寸变化不明显,第二相发生由细化到粗化再细化的变化。当加入0.05%Sr时,第二相细小均匀地分布于基体;当Sr加入量为0.1%和0.2%时,发现Al4Sr相;当Sr加入量为0.05%时,合金的力学性能最优,其抗拉强度和伸长率分别为259 MPa和15.47%,较未加Sr时分别提高了50%和727%。
[Abstract]:By means of optical microscope X-ray diffractometer and scanning electron microscope, the effect of adding 0.05 and 0.25 Sr on the solidification microstructure and mechanical properties of AZ91 magnesium alloy was studied. The results show that the primary phase coarsening of the alloy is obtained by adding trace Sr. With the increase of Sr addition, the morphology and size of the primary phase changed little, and the second phase changed from thinning to coarsening. The second phase is fine and uniformly distributed in the matrix when the addition of 0.05 Sr is added, the Al _ 4Sr phase is found when Sr content is 0.1% and 0.2%, and the mechanical properties of the alloy are optimal when the Sr content is 0.05%, the second phase is fine and uniformly distributed in the matrix, and when the Sr content is 0.1% and 0.2%, the mechanical properties of the alloy are optimized. The tensile strength and elongation are 259 MPA and 15.47 MPA respectively, which are 50% and 727% higher than those without Sr respectively.
【作者单位】：南昌航空大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51261026)
【分类号】：TG146.22

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