Effect of pre-aging on precipitation behavior of Al-1.29Mg-1.22Si-0.68Cu-0.69Mn-0.3Fe-0.2Zn-0.1Ti alloy

被引：3

作者：

刘宏 ^{[1
]}

陈扬 ^{[2
]}

赵刚 ^{[3
]}

刘春明 ^{[3
]}

左良 ^{[3
]}

机构：

[1] School of Mechanical Engineering, Shandong Institute of Light Industry, Ji'nan , China

[2] College of Material and Chemical Engineering, Liaoning Institute of Technology, Jinzhou , China

[3] School of Materials and Metallurgy, North eastern University, Shenyang , China

来源：

Transactions of Nonferrous Metals Society of China | 2006年 / 04期

关键词：

aluminum alloys; pre-aging; non-isothermal aging; isothermal aging; β″; nucleus;

D O I：

暂无

中图分类号：

TG113 [金相学（金属的组织与性能）];

学科分类号：

080502 ;

摘要：

By means of Vickers-hardness and electrical conductivity measurements, DSC tests and TEM analyses, the effect of different pre-aging treatments on precipitation characteristic of the Al-1.29Mg-1.22Si-0.68Cu-0.69Mn-0.3Fe-0.2Fe-0.1Ti (mass fraction, %) alloy during subsequent artificial aging was investigated. The results indicate that with increasing pre-aging time from 2.5 min to 10 min at 170 ℃, the number of formed β″ nuclei increases, resulting in promoting artificial aging kinetics and enhancing peak hardness. The hardness of pre-aged alloy reduces within lower temperature range of non-isothermal aging and increases in early stage of isothermal aging at 170 ℃. The size and density of clusters in pre-aged samples determine the hardenability in early stage of artificial aging. Pre-aging has dual mechanisms: namely, clusters (β″ nuclei) formed by pre-aging can inhibit the precipitation of GP zones during natural aging, and can quicken the precipitation of β″ phase in the early stage of subsequent artificial aging.

引用

页码：917 / 921

页数：5

共 3 条

[1] A differential scanning calorimetry study of aluminum alloy 6111 with different pre-aging treatments [J].

Miao, WF ;

Laughlin, DE .

JOURNAL OF MATERIALS SCIENCE LETTERS, 2000, 19 (03) :201-203

[2] Effects of Cu content and preaging on precipitation characteristics in aluminum alloy 6022 [J].

Miao, WF ;

Laughlin, DE .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2000, 31 (02) :361-371

[3] The effects of preaging treatments on aging kinetics and mechanical properties in AA6111 aluminum autobody sheet [J].

Bryant, JD .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1999, 30 (08) :1999-2006

← 1 →