Rheological behaviour and deformation characteristics of a commercial and a laboratory-cast Al-4%Cu alloy in the semi-solid state

被引：45

作者：

De Freitas, ER ^{[1
]}

Ferrante, M ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, Ctr Ciencia Exatas & Tehn, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil

来源：

ACTA MATERIALIA | 2001年 / 49卷 / 18期

关键词：

aluminum alloys; microstructure; rheology; texture;

D O I：

10.1016/S1359-6454(01)00239-7

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

A commercial AA2024 and a Al-4%Cu alloy in the semi-solid state (high solid volume fraction) were studied with regard to both theological and mechanical behaviour during simple compression. From stress-strain curves and power law exponents analysis two deformation regimes were identified. The deformation response was adequately described by the Ngyuen, Favier and Suery theoretical model. Comparison of stress-strain curves of the two materials showed that the 2024 alloy has higher intrinsic resistance. Interrupted and jump compression tests, plus different dwelling time experiments gave information on both thixotropy and microstructural evolution of the alloys. Microstructural observation showed that deformation is highly inhomogeneous and takes place by the formation of liquid,filled channels surrounding particle aggregates. Correlations between liquid phase segregation, particle size distribution and process parameters are discussed. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd All rights reserved.

引用

页码：3839 / 3847

页数：9

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