Improved mechanical properties in cast Al-Si alloys by combined alloying of Fe and Cu

被引：94

作者：

Wang, E. R. ^{[1
]}

Hui, X. D. ^{[1
]}

Wang, S. S. ^{[1
]}

Zhao, Y. F. ^{[1
]}

Chen, G. L. ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 527卷 / 29-30期

关键词：

Cast Al-Si eutectic alloys; Mechanical properties; alpha-Fe(Al-15(Fe Mn)(3)Si-2); theta(Al2Cu); INTERMETALLIC COMPOUNDS; TENSILE PROPERTIES; FATIGUE PROPERTIES; ALUMINUM-ALLOYS; COOLING RATE; AS-CAST; MICROSTRUCTURE; BEHAVIOR; IRON; PHASES;

D O I：

10.1016/j.msea.2010.08.058

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Al-Si eutectic alloys with the following composition (wt.%), 13.0 Si, 3.0-5.0 Cu, 0.3-0.8 Fe, <0.3 Ni, <0.15 Ti, <0.4 Mg and <0.6 Mn, were prepared by metal mold casting. The microstructure and fracture of these alloys were examined using SEM and TEM. It has been shown that Fe-rich and Cu-rich phases are solidified or precipitated in the form of a Chinese script or blocky alpha-Fe (Al-15(Fe, Mn)(3)Si2) and theta(Al2Cu) at the grain boundaries of alpha-Al dendrites. The ultimate tensile strength (UTS) and elongation of the alloy with 3.0% Cu and 0.3% Fe reach 310 MPa and 3.2%, respectively. By increasing Cu content to 5.0% and Fe to 0.8%, the UTS of Al-Si alloy is further enhanced to 336 MPa. It was observed that these Al-Si alloys fracture in a mixed mode with quasi-cleavage and ductile fracture morphology. (c) 2010 Elsevier B.V. All rights reserved.

引用

页码：7878 / 7884

页数：7

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