Effect of friction stir processing on the tensile and fatigue behavior of a cast A206 alloy

被引：27

作者：

Kapoor, R. ^{[1
,2
]}

Kandasamy, K. ^{[1
,2
]}

Mishra, R. S. ^{[1
,2
,3
]}

Baumann, J. A. ^{[4
]}

Grant, G. ^{[5
]}

机构：

[1] Missouri Univ Sci & Technol, Ctr Frict Stir Proc, Rolla, MO 65409 USA

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

[3] Univ N Texas, Dept Mat Sci & Engn, Denton, TX 76203 USA

[4] Boeing Co, St Louis, MO 63166 USA

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

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 561卷

基金：

美国国家科学基金会;

关键词：

Friction stir processing; Aluminum alloy; Cast; Fatigue; Strength; MECHANICAL-PROPERTIES; LIFE PREDICTION; MICROSTRUCTURE; PRECIPITATION; PARTICLE; REFINEMENT; EVOLUTION; STRENGTH; DEFECTS; WELDS;

D O I：

10.1016/j.msea.2012.10.090

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The microstructure of cast Al alloy A206 was modified using friction stir processing (FSP) to eliminate porosity, break down intermetallic particles and refine the grains. The inference from differential scanning calorimetry is that the nugget region of the as-FSP material contained primarily GP zones. Uniaxial tensile tests and bending fatigue tests were carried out at room temperature on A206 alloy in the cast and T4 conditions and after FSP with different heat treatments as-FSP, FSP and aging, and FSP with solutionizing and aging. These produced varied microstructures with combinations of pores, grain sizes, precipitate types and particle sizes. The ultimate tensile strength and ductility improved after FSP, while the yield strength showed no improvement. A further inference from differential scanning calorimetry and microscopy was that the yield strength depended more on the matrix heat treatment condition; whereas the UTS was limited more by the size and distribution of intermetallic particles. FSP improved both the total fatigue life and the life to crack initiation. Elimination of pores and reduction of the intermetallic particle size contributed to the increased fatigue life; subsequent heat treatments changed the fatigue life only marginally.

引用

页码：159 / 166

页数：8

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