Properties of SiC<sub>p</sub>/A357 Composites Fabricated by Double-deck Mechanical Stirring Casting

Zhang Zhenlin; Zhang Zhifeng; Xu Jun; Wang Yabao; Zhang Hao; Mao Weimin

doi:10.15980/j.tzzz.2017.06.005

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Properties of SiC_p/A357 Composites Fabricated by Double-deck Mechanical Stirring Casting
Vol. 37, Issue 6, Pages: 598-601(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.06.005

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[1]张桢林,张志峰,徐骏,王亚宝,张浩,毛卫民.双级机械搅拌铸造SiC_p/A357复合材料的工艺及性能[J].特种铸造及有色合金,2017,37(06):598-601.

Zhang Zhenlin, Zhang Zhifeng, Xu Jun, et al. Properties of SiC_p/A357 Composites Fabricated by Double-deck Mechanical Stirring Casting. [J]. Special Casting & Nonferrous Alloys 37(6):598-601(2017)
[1]张桢林,张志峰,徐骏,王亚宝,张浩,毛卫民.双级机械搅拌铸造SiC_p/A357复合材料的工艺及性能[J].特种铸造及有色合金,2017,37(06):598-601. DOI： 10.15980/j.tzzz.2017.06.005.

Zhang Zhenlin, Zhang Zhifeng, Xu Jun, et al. Properties of SiC_p/A357 Composites Fabricated by Double-deck Mechanical Stirring Casting. [J]. Special Casting & Nonferrous Alloys 37(6):598-601(2017) DOI： 10.15980/j.tzzz.2017.06.005.

摘要

以A357铝合金和SiC

粉作为原料

采用双级搅拌桨在不同工艺参数下对SiC

含量为20%的A357复合材料进行搅拌铸造

研究了不同工艺参数对SiC

分布均匀性的影响。对制得的SiC

/A357复合材料进行T6热处理

采用扫描电镜、硬度测试及拉伸试验

分析了热处理前后组织和力学性能的变化。结果表明

采用双级搅拌桨在搅拌温度为610℃

搅拌转速为800 r/min

搅拌时间为20 min下制备的复合材料中SiC

分布均匀性最佳。经T6热处理后

复合材料的抗拉强度和硬度明显上升

抗拉强度达到345 MPa

硬度（HB）为123.3

相比铸态分别提高66%和48.6%。断口分析表明

SiC

/A357复合材料的断裂机制为界面脱粘、Si C颗粒的断裂和基体合金的韧性断裂的混合机制。

Abstract

Through using A357 alloy and Si C micro powder as raw material

SiC

/A357 composites with 20%SiC

particles were prepared with different technological parameters of mechanical stirring casting using doubledeck impeller. The effects of technological parameters on the uniformity of SiC

in the composites prepared were investigated. The SiC

/A357 composites were treated by T6 treatment to analyze the influence of heat treatment on microstructure and mechanical properties of the composites by SEM

Brinell hardness and tensile test. The results reveal that the uniform distribution of SiC

using double-deck impeller can be observed at 800 r/min for 30 min and 610 ℃. After T6 heat treatment

the tensile strength and hardness of the composites reach 345 MPa and123. 3 HB

increased by 66% and 48. 6%

respectively

compared with those of as-cast ones. The fracture analysis reveals that the fracture mechanism of the composites is characterized by a mixed modes including interface decohesion between A357 and SiC

SiC

fracture and ductile fracture of A357 matrix.