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Published in: Physics of Metals and Metallography 13/2021

18-08-2021 | STRENGTH AND PLASTICITY

A Critical Assessment on Rotary Friction Welded High Strength Armor Grade Aluminum Alloy Joints

Authors: P. Hariprasath, P. Sivaraj, V. Balasubramanian

Published in: Physics of Metals and Metallography | Issue 13/2021

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Abstract

A high strength aluminum alloy has been widely employed in aerospace industry because of its high specific strength to weight ratio. Earlier, the fusion welding of aluminum alloys resulted in solidification cracking and shrinkage defects. To eliminate these drawbacks, the solid-state welding processes have been preferred to join the components of parts of armor grade aluminum alloy. This paper is devoted to the analysis of the mechanical properties and metallurgical characteristics of rotary friction welded aluminum alloy joints produced under optimized conditions. The maximum recorded transverse tensile strength and joint efficiency is of 472 MPa and 86%, respectively. The microstructural features exhibited ultrafine grains in the region of a fully-deformed zone (FDZ) of the alloy. The deformed grains in the thermomechanical affected zone (TMAZ) were recorded to have lower microhardness. Although, the dispersed precipitates revealed from the weld cross section were Al7Cu2Fe, Mg3Cr2Al18, and MgZn2. From this investigation, it has been found that most of the weld failures occurred due to grain deformation and subsequent softening during solidification.
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Metadata
Title
A Critical Assessment on Rotary Friction Welded High Strength Armor Grade Aluminum Alloy Joints
Authors
P. Hariprasath
P. Sivaraj
V. Balasubramanian
Publication date
18-08-2021
Publisher
Pleiades Publishing
Published in
Physics of Metals and Metallography / Issue 13/2021
Print ISSN: 0031-918X
Electronic ISSN: 1555-6190
DOI
https://doi.org/10.1134/S0031918X21130044