Mechanical properties as a function of microstructure and solidification thermal variables of Al-Si castings

被引：102

作者：

Goulart, PR ^{[1
]}

Spinelli, JE ^{[1
]}

Osório, WR ^{[1
]}

Garcia, A ^{[1
]}

机构：

[1] Univ Estadual Campinas, Dept Mat Engn, BR-13083970 Campinas, SP, Brazil

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 421卷 / 1-2期

基金：

巴西圣保罗研究基金会;

关键词：

Al-Si castings; mechanical properties; solidification thermal variables; microstructure;

D O I：

10.1016/j.msea.2006.01.050

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The aim of the present study was to investigate the influence of solidification thermal variables on the as-cast microstructure of hypoeutectic AI-Si alloys and to establish correlations with the casting mechanical properties. Experimental results include transient metal/mold heat transfer coefficients, tip growth rate, local solidification time, secondary dendrite ann spacing, ultimate tensile strength and yield strength as a function of solidification conditions imposed by the metal/mold system. It was found that the ultimate tensile strength increases with increasing alloy solute content and with decreasing secondary dendrite arm spacing. Yield strength seems to be independent of both alloy composition and dendritic arrangement. Such results have permitted general expressions correlating dendrite spacing with transient solidification processing variables to be established. The correlation of such expressions with experimental equations relating the ultimate tensile strength and dendrite spacing provides an insight in the preprogramming of solidification in terms of mechanical strength of Al-Si castings. Predictive theoretical and experimental approaches for dendritic growth have been compared with the present experimental observations. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：245 / 253

页数：9

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