Room temperature instability of an Al-4%Cu super saturated solid solution in a nano-crystalline alloy produced by SPD

被引：7

作者：

Huang, Y. ^{[1
]}

Robson, J. D. ^{[1
]}

Prangnell, P. B. ^{[1
]}

机构：

[1] Univ Manchester, Manchester Mat Sci Ctr, Manchester M1 7HS, Lancs, England

来源：

JOURNAL OF MATERIALS SCIENCE | 2010年 / 45卷 / 17期

基金：

英国工程与自然科学研究理事会;

关键词：

GRAIN-BOUNDARY PRECIPITATION; PERCENT CU; AL-MG; MICROSTRUCTURE; EVOLUTION; GROWTH; SIZE; DEFORMATION;

D O I：

10.1007/s10853-010-4318-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The long-term stability of a severely deformed aluminium alloy has been investigated when copper in solution is used to inhibit recovery. A grain thickness of only 70 nm was obtained in an Al-4 wt% Cu alloy, after processing by equal channel angular extrusion to a strain of epsilon(eff) similar to 15, resulting in a lamellar nano-grain structure. However, the severely deformed solid solution was found to be unstable at room temperature and copious precipitation of theta occurred at new grain boundaries within the deformed state. The solute level fell to equilibrium within similar to 9 months. The precipitation kinetics were shown to occur at many orders of magnitude higher than can predicted by classical theory.

引用

页码：4851 / 4857

页数：7

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