Fatigue crack growth behaviour of friction stir welded AA7075-T651 aluminium alloy joints

被引：30

作者：

Sivaraj, P. ^{[1
]}

Kanagarajan, D. ^{[1
]}

Balasubramanian, V. ^{[1
]}

机构：

[1] Annamalai Univ, Dept Mfg Engn, Annamalainagar 608002, Tamil Nadu, India

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2014年 / 24卷 / 08期

关键词：

AA 7075 aluminium alloy; friction stir welding; fatigue crack growth; microstructure; MECHANICAL-PROPERTIES; MICROSTRUCTURE; RESISTANCE; LIFE; ARC;

D O I：

10.1016/S1003-6326(14)63371-9

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The aim the present work is to evaluate the fatigue crack growth behaviour of 12 mm thick AA 7075-T651 aluminium alloy plates joined by FSW. Fatigue crack growth test was carried out on center cracked tensile (CCT) specimens extracted from the FSW joints and unwelded parent metal. Transverse tensile properties of the unwelded parent metal and welded joints were evaluated. Microstructures of the welded joints were analyzed using optical microscopy and transmission electron microscopy. The scanning electron microscope was used to characterize the fracture surfaces. It was found that the Delta K-cr of the welded joint is reduced by 10x10(-3) MPa.m(1/2) in comparison with the unwelded parent metal. Hence, the fatigue life of the friction stir welded AA 7075-T651 aluminium alloy joints is appreciably lower than that of the unwelded parent metal, which is attributed to the dissolution of precipitates in the weld region during friction stir welding.

引用

页码：2459 / 2467

页数：9

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