Effects of Trace Sr on Microstructure and Mechanical Properties of（Al2O3+Al3Zr）p/A356 Composites

Xu Ke; Zhao Yutao; Chen Gang; Zhang Songli; Sun Hongqiang; Huo Xiaoyang

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Effects of Trace Sr on Microstructure and Mechanical Properties of（Al₂O₃+Al₃Zr）_p/A356 Composites
Issue 2, Pages: 139-141(2008)
Published： 2008 ，
DOI：

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[1]许可,赵玉涛,陈刚,张松利,孙洪强,霍晓阳.Sr对(Al_2O_3+Al_3Zr)_p/A356复合材料组织及性能的影响[J].特种铸造及有色合金,2008(02):139-141+80-81.

Xu Ke, Zhao Yutao, Chen Gang, et al. Effects of Trace Sr on Microstructure and Mechanical Properties of（Al₂O₃+Al₃Zr）_p/A356 Composites. [J]. Special Casting & Nonferrous Alloys (2):139-141(2008)
[1]许可,赵玉涛,陈刚,张松利,孙洪强,霍晓阳.Sr对(Al_2O_3+Al_3Zr)_p/A356复合材料组织及性能的影响[J].特种铸造及有色合金,2008(02):139-141+80-81. DOI：

Xu Ke, Zhao Yutao, Chen Gang, et al. Effects of Trace Sr on Microstructure and Mechanical Properties of（Al₂O₃+Al₃Zr）_p/A356 Composites. [J]. Special Casting & Nonferrous Alloys (2):139-141(2008) DOI：

摘要

采用X射线衍射仪（XRD）和扫描电镜（SEM）分析以及力学性能测试

研究了微量Sr对A356-Zr（CO3）2体系熔体反应法合成的（Al2O3+Al3Zr）p/A356复合材料组织及性能的影响。SEM分析结果表明

微量Sr变质后

原位合成的Al3Zr和Al2O3颗粒细小

颗粒尺寸大部分在2～3μm之间;内生Al2O3、Al3Zr颗粒已不被凝固界面大量排斥和推移

而是大部分被捕捉进入固相

均匀分布在基体中;同时Sr使基体A356中Si相形貌从粗针状变为细小的颗粒状。力学性能测试结果表明

Sr变质后的复合材料的抗拉强度比未变质的复合材料提高了13.8%。

Abstract

Effects of trace Sr on microstructure and mechanical properties of（Al2O3+Al3Zr）p/A356 composites synthesized by the direct melt reaction in A356-Zr（CO3）2 system were investigated by X-ray diffraction（XRD）

scanning electron microscope（SEM） and tensile test.SEM observation reveals that in-situ synthesized fine Al3Zr and Al2O3 particles with 2

μm in size can be observed

which is uniformly distributed into the matrix due to not be rejected by solid/liquid interface but be engulfed in the solid phase

and the Si phase in the A356 alloy can be converted from coarse acicular into fine particle with trace Sr modification.The tensile strength of the Sr modified composites is increased by 13.8% compared with that of the composites without Sr modification.