Effect of Al-10RE Master Alloy on Microstructures and Mechanical Properties of the As-cast Al-20Si Alloy

Qiu Zhihua; Li Yunlong; Chen Huan; Chen Jianchun; Zhang Guodong; Pan Chunxu

doi:10.15980/j.tzzz.2015.06.020

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Effect of Al-10RE Master Alloy on Microstructures and Mechanical Properties of the As-cast Al-20Si Alloy
Vol. 35, Issue 6, Pages: 632-635(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.06.020

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[1]邱智华,李云龙,陈欢,陈建春,张国栋,潘春旭.Al-10RE中间合金对Al-20Si合金组织和性能的影响[J].特种铸造及有色合金,2015,35(06):632-635.

Qiu Zhihua, Li Yunlong, Chen Huan, et al. Effect of Al-10RE Master Alloy on Microstructures and Mechanical Properties of the As-cast Al-20Si Alloy. [J]. Special Casting & Nonferrous Alloys 35(6):632-635(2015)
[1]邱智华,李云龙,陈欢,陈建春,张国栋,潘春旭.Al-10RE中间合金对Al-20Si合金组织和性能的影响[J].特种铸造及有色合金,2015,35(06):632-635. DOI： 10.15980/j.tzzz.2015.06.020.

Qiu Zhihua, Li Yunlong, Chen Huan, et al. Effect of Al-10RE Master Alloy on Microstructures and Mechanical Properties of the As-cast Al-20Si Alloy. [J]. Special Casting & Nonferrous Alloys 35(6):632-635(2015) DOI： 10.15980/j.tzzz.2015.06.020.

摘要

研究了不同Al-10RE添加量对Al-20Si合金铸造组织和力学性能的影响。结果表明

加入Al-10RE后的Al-20Si合金主要由α-Al基体、初晶Si、共晶Si和针状的Al11RE3相组成;初晶Si的形状由大块状变为小块状和球状

其最佳加入量为1.5%

初晶Si平均晶粒尺寸最细小

且呈弥散均匀分布。其抗拉强度、伸长率和硬度达到最大值

分别为117 MPa、11.0%、87.76。分析认为

RE的加入改变了初晶Si晶粒的生长方式

而细化的晶粒以及针状Al11RE3相的产生又大大改善了Al-20Si合金的力学性能。

Abstract

Effects of Al-10 RE master alloy on the microstructure and mechanical properties of as-cast Al-20 Si alloy were investigated.The experimental results reveal that the as-casting microstructure of Al-20 Si alloy mainly consists ofα-Al matrix

primary Si

eutectic Si and acicular Al11RE3 phase with adding Al-10 RE master alloy.The morphology of primary Si in the hypereutectic Al-20 Si is transformed from bulky to small blocky and globular shape with the increase of the Al-10 RE addition.It is found that with addition of 1.5%Al-10 RE

the average grain size with dispersive and homogeneous distribution of primary Si can be observed.Meanwhile

the tensile strength

elongation and micro-hardness of as-cast Al-20 Si alloy are increases from 98 MPa to 117 MPa

from 9.7%to 11.0%

from 70.93 HV to 87.76 HV

respectively.The RE element can change the growth morphology of primary Si

and fine grain size and generation of acicular Al11RE3 improve greatly the mechanical properties of the alloy.