Processing, microstructure and property aspects of a spraycast Al-Mg-Li-Zr

被引：41

作者：

Hogg, S. C. ^{[1
]}

Palmer, I. G. ^{[1
]}

Thomas, L. G. ^{[1
]}

Grant, P. S. ^{[1
]}

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

spray forming; spraycasting; Al-Mg-Li-Zr; EBSD; dynamic recrystallisation; DISPERSION-STRENGTHENED ALLOY; DEFORMATION; FLOW;

D O I：

10.1016/j.actamat.2006.10.057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper describes a microstructural and property investigation of an Al-5.31Mg-1.15Li-0.28Zr alloy produced by sprayeasting and downstream processing. Following a dispersoid precipitation treatment of 4 h at 400 degrees C, samples were hot compressed at strain rates of 2, 1, 0.2 and 0.1 x 10(-2) s(-1) at temperatures between 250 and 475 degrees C. Electron backscattered diffraction showed a strong dependence of recrystallised grain size on deformation temperature. At 250 degrees C and faster strain rates at 325 degrees C, a network of fine recrystallised necklace grains formed by progressive lattice rotation. At 325 degrees C at slow strain rates and at 400 degrees C and higher, dynamic recrystallisation occurred by discontinuous nucleation and growth at regions of microscopic strain localisation such as grain boundaries and triple points. The microstructures from small-scale hot compression experiments were compared with larger forgings under similar conditions and microstructural evolution was broadly similar. Mechanical properties of larger-scale forgings exceeded the targets for mechanically alloyed Al-Mg-Li alloy AA5091. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1885 / 1894

页数：10

共 28 条

[1] Inhomogeneous deformation and microstructural evolution during the hot deformation of Al-4.98%Mg [J].