Influences of friction stir welding on the microstructure, mechanical and corrosion behaviour of AL-ZN-MG aluminium alloy 7039

Authors

  • Chaitanya Sharma Faculty of Mechanical Engineering, Rustamji Institute of Technology, Boarder Security Force Academy Tekanpur Gwalior, Madhya Pradesh, India-475005
  • Dheerendra Kumar Dwivedi Faculty of Mechanical Engineering, Indian Institute of Technology, Roorkee, Uttarkhand, India-247667
  • Pradeep Kumar Faculty of Mechanical Engineering, Indian Institute of Technology, Roorkee, Uttarkhand, India-247667

Keywords:

friction stir welding, Al-Zn-Mg aluminum alloy, microstructure, mechanical properties, corrosion behavior

Abstract

This paper presents the influence of friction stir welding (FSW) on the microstructure, mechanical and corrosion behavior of precipitation hardening Al-Zn-Mg alloy AA7039. The microstructure of weld joints was investigated using an optical microscope. The grains in weld nugget zone (WNZ) and thermo-mechanically affected zone (TMAZ) of weld joints were finer than in the base metal and a reverse trend was observed for heat affected zone (HAZ). Mechanical properties of friction stir weld joints were determined by tensile and micro hardness test. The ultimate tensile strength of weld joints was found approximately equal to the base metal while yield strength and ductility of weld joints were found lower than in the base metal. HAZ of weld joints was more susceptible to corrosion than WNZ, TMAZ and base metal. The HAZ exibits the highest current density followed by the base metal.

Author Biographies

Chaitanya Sharma, Faculty of Mechanical Engineering, Rustamji Institute of Technology, Boarder Security Force Academy Tekanpur Gwalior, Madhya Pradesh, India-475005

Associate Professor and Head of Mechanical Engineering DepartmentDean Student Affairs

Dheerendra Kumar Dwivedi, Faculty of Mechanical Engineering, Indian Institute of Technology, Roorkee, Uttarkhand, India-247667

Professor, Mechanical And Industrial Engineering Department

Pradeep Kumar, Faculty of Mechanical Engineering, Indian Institute of Technology, Roorkee, Uttarkhand, India-247667

Professor, Mechanical And Industrial Engineering Department

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Published

2015-10-13

Issue

Engineering Review, Vol. 35, No. 3

Section

Articles

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