Prediction of rheological behaviour and segregation susceptibility of semi-solid aluminium-silicon alloys by a simple back extrusion test

被引：41

作者：

Vieira, EA ^{[1
]}

Ferrante, M ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil

来源：

ACTA MATERIALIA | 2005年 / 53卷 / 20期

关键词：

aluminium-silicon; segregation; rheology; microstructural permeability;

D O I：

10.1016/j.actamat.2005.08.014

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper Studied the segregation susceptibility of a number of samples based on the Al-Si system and quenched from the semi-solid state. The work was performed on two compositions (A356 and A356 + 0.5Sn), characterized by spheroidal microstructures obtained by three different conditioning techniques. Viscosities were determined by a simple back-extrusion test and in order to obtain meaningful data a quantitative microstructural mapping of the extruded cups was carried Out. From these measurements, a precise assessment of the segregation extent of the samples was compiled and the data was rationalized in terms of the D'Arcy law. Results showed a positive correlation associating segregation extent, microstructural permeability, liquid phase percolation velocity during extrusion and microstructural features such as the Al-alpha particle size and shape. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5379 / 5386

页数：8

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