Hot deformation mechanisms of a solution-treated Al-Li-Cu-Mg-Zr alloy

被引：0
|
作者：
Avramovic-Cingara, G. [1 ]
Perovic, D.D. [1 ]
McQueen, H.J. [1 ]
机构：
[1] Univ of Toronto, Toronto, Canada
来源：
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | 1996年 / 27 A卷 / 11期
关键词：
Activation energy - Dislocations (crystals) - Grain size and shape - Heat treatment - Metallographic microstructure - Plastic deformation - Strain rate - Thermal effects - Torsion testing - Transmission electron microscopy - Viscous flow;
D O I：
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学科分类号：
摘要：
The deformation behavior and microstructural changes accompanying the dynamic restoration process were investigated in Al-Li-based alloys. The flow stresses for alloys tested under different hot torsional deformation conditions were found to depend on strain rate through a sinh function and on temperature through an Arrhenius behavior. Transmission electron microscopy was used to characterize the change in subgrain size with the conditions of deformations during hot processing. A large number of helical dislocation, prismatic loops and Orowan loop formation after deformation at 500 °C and 400 °C were observed. The density of these defects depended on the temperature of deformation and strain rate.
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页码：3478 / 3490
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