Sr對AZ91鎂合金凝固組織和力學(xué)性能的影響
發(fā)布時間：2018-07-14 10:36
【摘要】：利用光學(xué)顯微鏡、X射線衍射儀和掃描電鏡,研究了添加0.05%~0.25%Sr對AZ91鎂合金凝固組織和力學(xué)性能的影響。結(jié)果表明:加入微量Sr后,合金的初生相粗化。隨著Sr加入量的增加,初生相的形貌尺寸變化不明顯,第二相發(fā)生由細(xì)化到粗化再細(xì)化的變化。當(dāng)加入0.05%Sr時,第二相細(xì)小均勻地分布于基體;當(dāng)Sr加入量為0.1%和0.2%時,發(fā)現(xiàn)Al4Sr相;當(dāng)Sr加入量為0.05%時,合金的力學(xué)性能最優(yōu),其抗拉強(qiáng)度和伸長率分別為259 MPa和15.47%,較未加Sr時分別提高了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.
【作者單位】： 南昌航空大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51261026)
【分類號】：TG146.22
[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】：國家自然科學(xué)基金資助項目(51261026)
【分類號】：TG146.22
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