Correlating Tensile Properties with Microstructures of Various Regions in Gas Tungsten Arc Welded AA2014 Alloy

M.P. Shankar; R. Sokkalingam; Katakam Sivaprasad; V. Muthupandi

doi:10.4028/www.scientific.net/MSF.969.22

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HomeMaterials Science ForumMaterials Science Forum Vol. 969Correlating Tensile Properties with...

Correlating Tensile Properties with Microstructures of Various Regions in Gas Tungsten Arc Welded AA2014 Alloy

Abstract:

AA2014 is a heat treatable aluminium alloy found its application in light weight structures owing to its superior strength to weight ratio. The alloy was welded with automatic gas tungsten arc welding. The microstructure and mechanical properties of each zone such as parent metal (PM), heat affected zone (HAZ) and fusion zone (FZ) of the weldment were studied using optical microscopy, microhardness survey and micro-tensile testing. The PM with elongated grains with evenly distributed Al₂Cu phases showed a tensile strength of 456 MPa and 24% elongation; the HAZ and FZ offered a reduction in strength and ductility. The grain coarsening with segregation of continuous string of Al₂Cu along grain boundaries in HAZ and the formation of coarse dendritic grains with continuous network of brittle Al₂Cu and a minor fraction of porosity at interdendrite in FZ were attribured to the observed strength reduction in these regions. Keywords: AA2014 alloy; gas tungsten arc welding; optical microscopy; microhardness; micro-tensile testing.

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Materials Science Forum (Volume 969)

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22-26

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https://doi.org/10.4028/www.scientific.net/MSF.969.22

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August 2019

Authors:

M.P. Shankar, R. Sokkalingam, Katakam Sivaprasad*, V. Muthupandi

Keywords:

AA2014 Alloy, Gas Tungsten Arc Welding, Microhardness, Micro-Tensile Testing, Optical Microscopy

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