Study of intermetallic phase transformations in 3XXX alloys using diffusion couples

被引：2

作者：

Alexander, DTL

Hamerton, RG

Cama, H

Greer, AL

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England

[2] Alcan Int Ltd, Banbury Lab, Banbury OX16 2SP, England

来源：

ALUMINUM ALLOYS 2002: THEIR PHYSICAL AND MECHANICAL PROPERTIES PTS 1-3 | 2002年 / 396-4卷

关键词：

intermetallics; phase transformation; eutectoid; reversion; scanning electron microscopy; diffusion couples; grain structure;

D O I：

10.4028/www.scientific.net/MSF.396-402.681

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A study is made of the mechanisms of the commercially important phase transformation of Al-6(Fe,Mn) to alpha-Al-(Fe,Mn)-Si phase during homogenisation of direct-chill (DC) cast ingots of AA3104 alloy. Annealing a diffusion couple of an Al-Fe-Mn alloy (containing only Al-6(Fe,Mn) particles) and an Al-Si alloy permits study of the effects of steadily increasing silicon content, and thereby of the nucleation stage of the transformation. Initially the Al6(Fe,Mn) particles undergo the eutectoid transformation (to alpha-phase and ccp Al) typical for DC-cast alloy, the highly deformed microstructure of the roll-bonded diffusion couple facilitating nucleation of the transformation. Later, the aluminium matrix recrystallises, and nucleation is limited to selected particles on the grain boundaries; in that case the majority of Al-6(Fe,Mn) particles do not transform by the eutectoid mechanism. Markedly coarser alpha-phase particles indicate that the Al-6(Fe,Mn) particles instead transform by dissolving and supplying transition metals for growth of alpha-phase particles.

引用

页码：681 / 686

页数：6

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