Intermetallics Formation during Solidification of Al-Si-Cu-Mg Cast Alloys

被引：21
作者：
Mohamed, Adel M. A. [1 ]
Samuel, Ehab [2 ]
Zedan, Yasser [3 ]
Samuel, Agnes M. [2 ]
Doty, Herbert W. [4 ]
Samuel, Fawzy H. [2 ]
机构：
[1] Suez Univ, Fac Petr & Min Engn, Met & Mat Engn Dept, Suez 43721, Egypt
[2] Univ Quebec Chicoutimi, Dept Sci Appl, Saguenay, PQ G7H 2B1, Canada
[3] Ecole Technol Super, Dept Genie Mecan, Montreal, PQ H3C 1K3, Canada
[4] Gen Motors Global Technol Ctr, Mat Technol, Estes Bldg, Warren, MI 48093 USA
来源：
MATERIALS | 2022年 / 15卷 / 04期
关键词：
Al-Si alloys; intermetallics; solidification; phase identification; EPMA; porosity; mechanical properties; SR; PHASES; ADDITIONS; STRENGTH; BEHAVIOR; FATIGUE;
D O I：
10.3390/ma15041335
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The present study was undertaken to examine the effect of iron, manganese, copper and magnesium on the microstructural characteristics of Al-11%Si-2%Cu-Mg-based alloy referred to as 396 under different working conditions. The results show that strontium (Sr) has high affinity to react with magnesium (Mg), resulting in reduced effectiveness as eutectic silicon modifier or age hardening agent. In addition, Sr alters the sequence of the precipitation of the alpha-AlFeMnSi phase from post-eutectic to pro-eutectic which would harden the soft alpha-Aluminum matrix. The mechanism is still under investigation. The interactions between iron (Fe) and Mg and Sr-Mg result in the formation of serval dissolvable intermetallics during the solutionizing treatment such as beta-AlFeSi, pi-AlFeMgSi and Q-AlMgSiCu phases. The study also emphasizes the role of modification and grain refining as well as intermetallics in porosity formation and hardness of samples aged in the temperature range 155-240 degrees C.
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页数：24
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