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semi-coherent-precipitates
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An investigation into the microstructure of friction-stir welded and artificially aged AA2017
, Article Journal of Materials Engineering and Performance ; Volume 22, Issue 11 , 2013 , Pages 3566-3571 ; 10599495 (ISSN) ; Aval, H. J ; Serajzadeh, S ; Sharif University of Technology
2013
Abstract
Microstructural changes in friction-stir welding (FSW) of artificially aged AA2017 were investigated. First, FSW was performed with rotational and linear speeds of 800 rpm and 40 mm/min, respectively. Then, microstructural studies by means of optical metallography and electron microscopy were conducted in different regions of the welded plates. Hardness testing was also employed to determine local strength and subsequent natural aging progress after welding. The results indicate that the considerable hardness degradation occurs in the thermo-mechanically affected zone owing to coarsening of semi-coherent precipitates. Grain refinement also takes place in the weld nugget as a result of...