Experimental study and analysis of the wear properties of friction-stir-welded AA7075-T6 and A384.0-T6 dissimilar aluminium alloys of butt joints

Abstract

The wear is one of the main issues in friction-stir welding (FSW) of dissimilar aluminium alloys. Two dissimilar metals welded with FSW have different mechanical, metallurgical and chemical properties compared to the parent materials. Therefore, the wear resistance is an important property in an FSW process. In this research, AA7075-T6 and A384.0-T6 aluminium alloys with a thickness of 6.35 mm were selected and a design matrix was developed to produce FSW welds using the MINITAB-17 software. Friction-stir-welded pieces were made as test specimens and their ultimate tensile strengths (UTSs) were tested. In these experiments, the maximum-and minimum-UTS specimens were used for a wear-resistance analysis and its results were compared with the wear resistance of the parent metals. The results were obtained by keeping the revolutions per minute (min-1), time and sliding velocity as constants, while varying the load applied. The rpm, time and sliding velocity were 500, 300 s and 3.141 m/s, respectively. The loads applied were (20, 40 and 60) N. The conclusion is that, under all the applied loads, the wear of the friction-stir weld produced is lower than that of the A384.0-T6 aluminium base metal. On the other hand, the wear of the weld is higher than the AA7075-T6 aluminium base metal.

Experimental Investigation on Wear and Corrosion Behavior of Stir Cast Alloys and Friction Stir Cast Welds

“…Karuppannan Anganan et al [11] analysed the wear attributes of stir welded AA 7075 and A384 (Both in T6 condition). Experimentation revealed that higher order of wear is observed for A384 T6 and lower trend is observed for the later.…”

Effects of prior annealing on the mechanical properties of a twist-extruded AA 7075 aluminum alloy

“…Such alloys are used in various components of aerospace applications. 22,23 However, a lack of examination and improvement during the TE experiments of aluminum alloys is observed. This study aims at examining the effect of the annealing temperature on the TE behavior of aluminum alloy AA 7075, as indicated by the post-processing mechanical properties, including the tensile strength, micro-hardness and microstructural characteristics.…”