DISSOLUTION OF IRON INTERMETALLICS IN AL-SI ALLOYS THROUGH NONEQUILIBRIUM HEAT-TREATMENT

被引：125

作者：

NARAYANAN, LA

SAMUEL, FH

GRUZLESKI, JE

机构：

[1] MCGILL UNIV,DEPT APPL SCI,MONTREAL,PQ,CANADA

[2] UNIV QUEBEC,DEPT APPL SCI,CHICOUTIMI,PQ G7H 2B1,CANADA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1995年 / 26卷 / 08期

关键词：

D O I：

10.1007/BF02670687

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Conventional heat treatment techniques in Al-Si alloys to achieve optimum mechanical properties are limited to precipitation strengthening processes due to the presence of second-phase particles and spheroidization of silicon particles. The iron intermetallic compounds present in the microstructure of these alloys are reported to be stable, and they do not dissolve during conventional (equilibrium) heat treatments. The dissolution behavior of iron intermetallics on nonequilibrium heat treatment has been investigated by means of microstructure and mechanical property studies. The dissolution of iron intermetallics improves with increasing solution temperature. The addition of manganese to the alloy hinders the dissolution of iron intermetallics. Nonequilibrium heat treatment increases the strength properties of high iron alloys until a critical solution temperature is exceeded. Above this temperature, a large amount of liquid phase is formed as a result of interdendritic and grain boundary melting. The optimum solution treatment temperature for Al-6Si-3.5Cu-0.3Mg-1Fe alloys is found to be between 515 degrees C and 520 degrees C.

引用

页码：2161 / 2174

页数：14

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