Microstructure and rheological behavior of grain refined and modified semi-solid A356 Al-Si slurries

被引：50
|
作者：
Nafisi, Shahrooz
Lashkari, Omid
Ghomashchi, Reza [1 ]
Ajersch, Frank
Charette, Andre
机构：
[1] Univ Quebec Chicoutimi, Ctr Univ Res Aluminum, CURAL, Chicoutimi, PQ G7H 2B1, Canada
[2] Ecole Polytech, Montreal, PQ H3C 3A7, Canada
来源：
ACTA MATERIALIA | 2006年 / 54卷 / 13期
基金：
加拿大自然科学与工程研究理事会;
关键词：
semisolid; SEED process; rheological properties; viscosity; grain refiner; modifier;
D O I：
10.1016/j.actamat.2006.03.016
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A comprehensive study was carried out to establish the effect of melt treatment using Ti-B grain refiner and Sr modifier additions on the microstructural evolution and rheological properties of A356 aluminum alloy in the semisolid state. Rheocast billets of 75 mm in diameter and similar to 140 mm in length, prepared by the SEED process, were deformed and several parameters were investigated to characterize the flow behavior of the billets in a compression test. Strain-time graphs were used to calculate the viscosity and liquid segregation was monitored to identify the optimum conditions for melt treatment. It is shown that non-treated alloy has the highest apparent viscosity. Refined semisolid billets have smaller particle size and more globularity of primary alpha-Al particles and as a result deform and flow more easily. It is postulated that modifier addition reduces the liquid surface tension and leads to improved deformability. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：3503 / 3511
页数：9
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