Effects of Si, Cu and Mg Addition on Electrical Conductivity and Mechanical Properties of Cast Aluminum Alloys

Shi Xia; Yao Sanjiu; Bai Xiao; Li Sirui

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Effects of Si, Cu and Mg Addition on Electrical Conductivity and Mechanical Properties of Cast Aluminum Alloys
Vol. 30, Issue 12, Pages: 1162-1165(2010)
Published： 2010 ，
DOI：

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[1]史霞,姚三九,白霄,李思瑞.Si、Cu、Mg元素对ZL101合金电导率和力学性能的影响[J].特种铸造及有色合金,2010,30(12):1162-1165+1077.

Shi Xia, Yao Sanjiu, Bai Xiao, et al. Effects of Si, Cu and Mg Addition on Electrical Conductivity and Mechanical Properties of Cast Aluminum Alloys. [J]. Special Casting & Nonferrous Alloys 30(12):1162-1165(2010)
[1]史霞,姚三九,白霄,李思瑞.Si、Cu、Mg元素对ZL101合金电导率和力学性能的影响[J].特种铸造及有色合金,2010,30(12):1162-1165+1077. DOI：

Shi Xia, Yao Sanjiu, Bai Xiao, et al. Effects of Si, Cu and Mg Addition on Electrical Conductivity and Mechanical Properties of Cast Aluminum Alloys. [J]. Special Casting & Nonferrous Alloys 30(12):1162-1165(2010) DOI：

摘要

采用正交试验方法研究了合金元素Si、Cu、Mg加入量对铸造铝合金电导率与力学性能的影响。结果表明

Si改善合金抗拉强度

但Si作为半导体

严重地减少铝基体的有效导电截面

故而降低合金导电性;Cu和Mg明显提高合金的强度

但其固溶在铝基体中

使得基体晶格畸变增加

电子波的散射几率增加

因而降低合金导电性。经T6处理后

合金的电导率和力学性能得到进一步改善提高。

Abstract

Effects of different Si

Cu and Mg additions on electrical conductivity and mechanical properties of cast aluminum alloy were investigated by orthogonal testing. The results reveal that Si can improve tensile strength of the aluminum alloy

however

it can also deteriorate the electrical conductivity as a result of severely reducing effective conductive cross-section as a semi-conductor. Cu and Mg can increase the tensile strength of the alloy while they decrease electrical conductivity as a result of Cu and Mg solving in the aluminum matrix resulting in the increase of matrix lattice distortion and scattering rate of electron wave. Electrical conductivity and mechanical properties of the T6 treated alloy are further improved

which is attributed to the homogeneous precipitation of Mg2Si

Al2Cu

CuMgAl2（S） and Q/W （AlxSi4Mg5Cu4） and the weakness of Si dissevering the matrix.