Effect of Cu content on microstructures and properties of Al-Mg-Si-Cu alloys

被引：0

作者：

Wang, Zhi-Xiu ^{[1
,2
,3
]}

Li, Hai ^{[2
,3
]}

Gu, Jian-Hua ^{[2
,3
]}

Song, Ren-Guo ^{[2
,3
]}

Zheng, Zi-Qiao ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Central South University, Changsha 410083, China

[2] School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China

[3] Key Laboratory of Advanced Metal Materials of Changzhou City, Changzhou University, Changzhou 213164, China

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2012年 / 22卷 / 12期

关键词：

High resolution transmission electron microscopy - Magnesium alloys - Copper alloys - Differential scanning calorimetry - Intergranular corrosion - Silicon alloys - Copper corrosion - Precipitates - Microstructure - Electric conductivity - Precipitation (chemical) - Scanning electron microscopy - Tensile strength - Vickers hardness - Aluminum corrosion - Corrosion resistance - Age hardening - Corrosion resistant alloys;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The microstructures and properties of Al-Mg-Si-Cu alloys were investigated by differential scanning calorimetry, Vickers hardness, electrical conductivity, tensile properties test, intergranular corrosion and transmission electron microscopy. The hardness of the alloys aged at 180°C increases to a peak value and decreases subsequently. The hardening rates of the alloys increase with the increase of Cu content, and the softening rate decreases due to overageing. The electrical conductivity of the alloys firstly decreases to a minimum value and increases subsequently. The electrical conductivity decreases with the increase of Cu content. With the Cu content increasing, the tensile strengths of the alloys in T6 and T4 increase, and the resistance to intergranular corrosion decreases, but the alloy without Cu does not present intergranular corrosion sensitivity. The kind of the precipitates in the T6 alloy varies with the Cu content increasing. β″ phase dominates in the alloys at the Cu content lower than 0.6, but β″ and Q' coexist in the alloys with Cu content of 0.9. The number density and volume fraction of the precipitates increase with the increase of Cu content and the size decreases. The precipitates are solute clusters in the T4 alloy.

引用

页码：3348 / 3355