Effect of grain refining and Sr-modification interactions on the impact toughness of Al-Si-Mg cast alloys

被引：88
|
作者：
Samuel, A. M. [1 ]
Doty, H. W. [2 ]
Valtierra, S. [3 ]
Samuel, F. H. [1 ]
机构：
[1] Univ Quebec Chicoutimi, Quebec City, PQ, Canada
[2] Gen Motors, Pontiac, MI 48340 USA
[3] Corp Nemak, SA DE CV, Garza Garcia 66221, NL, Mexico
来源：
MATERIALS & DESIGN | 2014年 / 56卷
关键词：
Aluminum alloys; Microstructure; Grain refinements; Impact toughness; IRON INTERMETALLIC PHASE; HEAT-TREATMENT; TI-B; REFINEMENT; FE; ADDITIVES; ALUMINUM;
D O I：
10.1016/j.matdes.2013.10.029
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The present work investigates the effects of various types of grain refiners on the impact properties of Srmodified A356.2 alloys in both the as-cast and heated-treated conditions. The results showed that the addition of Ti and B greatly improves the alloy toughness, but only when the alloy was in a fully modified state; moreover, the right type of master alloy and addition levels must be used. The highest values of the total absorbed energy recorded for T6-tempered alloys were obtained using Al-5% Ti-1% B and Al-10% Ti master alloys in addition to 0.04% Ti. A significant deterioration in the impact properties is observed due to the Sr-B interaction (in some cases). The improvements in toughness may be attributed to the change in Si particle morphology as well as to the dissolution and fragmentation of a number of the intermetallics formed during the T6 temper. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：264 / 273
页数：10
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