Microstructure of friction stir welded joints of 2017A aluminium alloy sheets

Abstract

Summary The present study examines a friction stir welded 2017A aluminium alloy. Transmission electron microscope investigations of the weld nugget revealed the average grain size of 5 μm, moderate density of dislocations as well as the presence of nanometric precipitates located mostly in grains interiors. Scanning electron microscope observations of fractures showed the presence of ductile fracture in the region of the weld nugget with brittle precipitates in the lower part. The microhardness analysis performed on the cross‐section of the joints showed fairly small changes; however, after the artificial ageing process an increase in hardness was observed. The change of the joint hardness subject to the ageing process indicates partial supersaturation in the material during friction stir welding and higher precipitation hardening of the joint.

Cast aluminium matrix composites modified with using FSP process – Changing of the structure and mechanical properties

“…Modifing was carried out at a room temperature. A detailed description of the FSW/FSP process is provided in a number of publications [17,18,57].…”

“…The FSW / FSP process is widely described in the Figure 1: Schematic of FSW/FSP process [18] literature [19][20][21]. It consists in frictional mixing of a material in the solid state.…”

Microstructure and properties of friction stir welded aluminium alloys

“…In Poland, the development of this methodology has carried on over several years at the Institute of Welding in Gliwice [5 -7] and in Kracow at the PAN Institute of Metallurgy and Materials Science, in collaboration with the University of Education [8,9], but due to the scale of the problem, the research is limited to only a few or several alloys.…”

Fatigue and Static Properties of Friction Stir Welded Aluminium Alloy 6082 Lap Joints Using Triflute-Type and Smooth Tool

“…Since then continuing development of this method has been observed and main applications of FSW are connected with welding of aluminium alloys (99% of all joints) and generally there are butt connections of long elements. The advantages of this method and its characteristics are shown in many publications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”