Effect of Friction Stir Processing on Microstructure and Tensile Properties of an Investment Cast Al-7Si-0.6Mg Alloy

被引：37

作者：

Jana, Saumyadeep ^{[1
,2
]}

Mishra, Rajiv S. ^{[2
]}

Baumann, John A. ^{[3
]}

Grant, Glenn J. ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

[2] Missouri Univ Sci & Technol, Rolla, MO 65409 USA

[3] Boeing Res & Technol, St Louis, MO 63166 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2010年 / 41A卷 / 10期

基金：

美国国家科学基金会;

关键词：

MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; GRAIN-STRUCTURE; HEAT-TREATMENT; STRENGTH; REFINEMENT; BEHAVIOR;

D O I：

10.1007/s11661-010-0324-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Friction stir processing (FSP) is emerging as a promising tool for microstructural modification. The current study assesses the effects of FSP on the microstructure and mechanical properties of an investment cast Al-7Si-Mg alloy. FSP eliminates porosity and significantly refines eutectic Si particles. The extent of particle refinement varied with changes in processing conditions. A high tool rotation rate and a low-to-intermediate tool traverse speed generated a higher volume fraction of finer particles. Tensile ductility changed significantly as a result of FSP, whereas ultimate tensile strength improved only marginally. Yield strength was similar in both cast and FSP samples under various heat-treated conditions, with the highest value obtained after a T6 heat treatment. Furthermore, FSP caused significant grain refinement in the stir zone, subsequently transforming into very coarse grains as abnormal grain growth occurred during solution treatment at high temperature.

引用

页码：2507 / 2521

页数：15

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