SDAS, Si and Cu Content, and the Size of Intermetallics in Al-Si-Cu-Mg-Fe Alloys

被引：13

作者：

Sivarupan, Tharmalingam ^{[1
]}

Taylor, John Andrew ^{[1
]}

Caceres, Carlos Horacio ^{[1
,2
]}

机构：

[1] Univ Queensland, CAST Cooperat Res Ctr, Mat Engn, Sch Engn, Brisbane, Qld 4072, Australia

[2] Univ Queensland, ARC Ctr Excellence Design Light Met, Sch Engn, Mat Engn, Brisbane, Qld 4072, Australia

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2015年 / 46A卷 / 05期

关键词：

CASTING ALLOYS; BETA-AL5FESI PHASE; IRON; PENETRATION; MORPHOLOGY; DUCTILITY; ELECTRONS;

D O I：

10.1007/s11661-015-2808-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Plates of Al-(a) Si-(b) Cu-Mg-(c) Fe alloys with varying content of (mass pct) Si (a = 3, 4.5, 7.5, 9, 10, or 11), Cu (b = 0, 1, or 4), and Fe (c = 0.2, 0.5 or 0.8) were cast in sand molds with a heavy chill at one end to ensure quasi-directional solidification over a wide range of Secondary Dendrite Arm Spacing (SDAS). Statistical analysis on the size of the beta-Al5FeSi, alpha-Al8Fe2Si, or Al2Cu intermetallics on Backscattered Electron images showed that a high Si content reduced the size of the beta platelets in alloys with up to 0.5 Fe content regardless of the SDAS, whereas at small SDAS the refining effect extended up to 0.8 Fe, and involved alpha-phase intermetallics which replaced the beta platelets at those concentrations. At low Si contents, a high Cu level appeared to have similar refining effects as increased Si, through the formation of alpha-phase particles in the post-eutectic stage which agglomerated with the Al2Cu intermetallics. A high content of Si appears to make the overall refining process less critical in terms of SDAS/cooling rate. (C) The Minerals, Metals & Materials Society and ASM International 2015

引用

页码：2082 / 2107

页数：26

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