Sr對(duì)AZ91鎂合金凝固組織和力學(xué)性能的影響
[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.
【作者單位】: 南昌航空大學(xué)材料科學(xué)與工程學(xué)院;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(51261026)
【分類號(hào)】:TG146.22
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