Investigations on work hardening behaviour and relative slip distance in GTA welded AA 6063 plates using AA 5356-TiB2 filler rod

Ramkumar, KR and Menghani, J and Jha, VK and Vikram, RJ and Sivasankaran, S and Kim, HS (2022) Investigations on work hardening behaviour and relative slip distance in GTA welded AA 6063 plates using AA 5356-TiB2 filler rod. In: Materials Characterization, 194 .

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Abstract

The present work deals with the enhancement of the tensile strength of AA 6063 plates welded by the GTAW technique using AA 5356 filler metal sprayed with TiB2 nanoparticles (0, 4, 8 and 12 wt). Advanced characterization techniques were used to observe microstructural variations and correlate them with the properties of the tensile curves. The X-ray profiles revealed the absence of a thermochemical reaction, variations in the position and intensity of the α-Al peak in the weldment. The IPF micrographs revealed the refined grains in the α-Al phase owing to the incorporation of TiB2 nanoparticles which prevented the nucleation of grain growth according to the Zener pinning effect (0 and 12 wt TiB2 weld: 103 ± 8 and 26 ± 8 μm, respectively). The pole figures show that the weakened texture in the planes can be attributed to the severe deformation of the grains (0 and 12 wt TiB2 weld: 6.086 and 1.842, respectively). The engendered strain fields and accumulated dislocations enhanced the load-carrying ability of α-Al weldments. These factors improved the mechanical strength of the weld. The 12 wtTiB2/α-Al weld demonstrated the higher work hardening rate. Increases in the strain hardening exponent provided more plastic properties and a decreased relative slip distance extended the occurrence of deformation during tension.

Item Type:	Journal Article
Publication:	Materials Characterization
Publisher:	Elsevier Inc.
Additional Information:	The copyright for this article belongs to Elsevier Inc.
Keywords:	Aluminum compounds; Deformation; Fillers; Grain growth; Metal nanoparticles; Strain hardening; Strain rate; Tensile strength; Textures; Titanium compounds; Welding, AA 6063; Pinning effects; Relative slip; Relative slip distance; Slip distance; Weldments; Work hardening behaviors; Work hardening rate; Zener pinning effect; Zener-pinning, Welds
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	28 Oct 2022 07:35
Last Modified:	28 Oct 2022 07:35
URI:	https://eprints.iisc.ac.in/id/eprint/77615

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