Effects of Particle Content on Microstructure and Mechanical Properties of SiC<sub>p</sub>/A356 Composites

Hu Kun; Yuan Du; LüShulin; Wu Shusen

doi:10.15980/j.tzzz.2018.02.023

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Effects of Particle Content on Microstructure and Mechanical Properties of SiC_p/A356 Composites
Vol. 38, Issue 2, Pages: 197-200(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.02.023

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[1]胡坤,袁渡,吕书林,吴树森.纳米颗粒含量对SiC_p/A356复合材料组织和性能的影响[J].特种铸造及有色合金,2018,38(02):197-200.

Hu Kun, Yuan Du, LüShulin, et al. Effects of Particle Content on Microstructure and Mechanical Properties of SiC_p/A356 Composites. [J]. Special Casting & Nonferrous Alloys 38(2):197-200(2018)
[1]胡坤,袁渡,吕书林,吴树森.纳米颗粒含量对SiC_p/A356复合材料组织和性能的影响[J].特种铸造及有色合金,2018,38(02):197-200. DOI： 10.15980/j.tzzz.2018.02.023.

Hu Kun, Yuan Du, LüShulin, et al. Effects of Particle Content on Microstructure and Mechanical Properties of SiC_p/A356 Composites. [J]. Special Casting & Nonferrous Alloys 38(2):197-200(2018) DOI： 10.15980/j.tzzz.2018.02.023.

摘要

采用超声机械搅拌方法制备出了不同质量分数的纳米SiC

/A356复合材料

并研究了SiC

含量对合金微观组织以及性能的影响。结果表明

基体A356合金微观组织由粗大初生α-Al树枝晶和长针状的共晶相组成

但随着SiC

的加入

初生α-Al相从粗大树枝晶向玫瑰状转变

晶粒得到了明显细化

并且共晶Si逐渐变短并部分圆整化。纳米SiC

在共晶Si周围分布均匀

并没有发现大范围的团聚现象。不同SiC

含量的复合材料的室温抗拉强度、屈服强度、伸长率相对于基体都有了较大的提升。当SiC

含量为2%时

抗拉强度、屈服强度、伸长率分别为226 MPa、128 MPa、5.6%

较基体分别提高了19%、58%、22%。

Abstract

SiC

/A356composites with different SiC

mass fraction were prepared by ultrasonic treatment(UT

and effects of SiC

content on the microstructure and mechanical properties of the composites were investigated.The results show that the microstructure of A356alloy is composed of coarse primaryα-Al dendrites and long acicular eutectic Si.With the addition of SiC

the morphology of theα-Al grain is converted from coarse dendrites to rosette crystal uniformly.The microstructure is obviously refined and the eutectic Si becomes gradually shorter.Nano-SiC

is distributed uniformly around the eutectic Si by ultrasonic treatment.The ultimate tensile strength

yield strength and elongation of the 0.5%

1%and2%SiC

/A356nanocomposites are simultaneously improved.Especially

when the SiC

content reach to2%

the tensile strength

yield strength and elongation of the composites reach 226MPa

138MPa and5.6%

increased by 19%

51%and 22%

respectively compared with those of the matrix alloy.