Structural evolution and grain growth kinetics during isothermal heat treatment of nanostructured Al6061

被引：15

作者：

Hosseini, N. ^{[1
]}

Abbasi, M. H. ^{[1
]}

Karimzadeh, F. ^{[1
]}

Enayati, M. H. ^{[1
]}

机构：

[1] Isfahan Univ Technol, Nanotechnol & Adv Mat Inst, Dept Mat Engn, Esfahan 8415683111, Iran

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 525卷 / 1-2期

关键词：

Al6061; alloy; Grain growth; Nanostructured materials; Mechanical milling; THERMAL-STABILITY; NANOCRYSTALLINE; ALLOY;

D O I：

10.1016/j.msea.2009.06.051

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Grain growth kinetics of nanostructured Al6061 powder prepared via mechanical milling was studied through isothermal heat treatment. The results showed that after 30 h of milling, the powder was composed of an Al-based supersaturated solid solution with a grain size of 35 nm and lattice strain of 0.43%. Release of lattice strain, intermetallic precipitation and grain growth occurred upon heating of the 30 h-milled powder. Nevertheless, grain growth was very limited and Al grains with size of 50-60 nm were still present after exposure to 550 degrees C (0.83Tm) for 3 h. The activation energies for the grain growth were found to be 112.3 kJ/mol for annealing at 150-300 degrees C and 148.4 kJ/mol for annealing at 350-550 degrees C. Additionally, the isothermal grain growth exponent (n) was obtained in the range of 0.024-0.21. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：107 / 111

页数：5

共 21 条

[1] AN INSITU TEM STUDY OF THE THERMAL-STABILITY OF NANOCRYSTALLINE NI-P [J].