Paper Titles
Preface
Impact of Artificial Aging Temperature Cycles on Microstructure and Tensile Behavior of TIG Welded Dissimilar Aluminum Alloys
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Influence of Dual Soaking Durations and Variable Tool Feed Rates on Tensile Behavior of Friction Stir Welded Aluminum 2219
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Properties of Epoxy Coatings Electrodeposited from Cationic Epoxy Suspensions Prepared by Different Secondary Amine's Volumes
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Development of Recycling of Alloyed Industrial Waste by Carbothermic Reduction with the Determination of Structural and Phase Composition of the Obtained Materials
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Impact of Artificial Aging Temperature Cycles on Microstructure and Tensile Behavior of TIG Welded Dissimilar Aluminum Alloys

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Abstract:

Aluminium alloys are widely used in the automotive and aerospace industries, where permanent fastening methods are commonly employed to join aluminium sheets and components. Many aluminium alloys are known for their high strength-to-weight ratio, while others are favoured for their availability and cost-effectiveness. In modern applications, dissimilar aluminium alloys are often joined to achieve enhanced performance. This study explored the effects of artificial aging on the microstructural and mechanical properties of weld joints at varying temperatures. Significant microstructural differences were observed between the heat-affected zone (HAZ) and the weld zone (WZ). Coarse grains in the HAZ enhanced ductility, while the fine-grained structure and increased precipitate formation in the WZ improved strength but reduced ductility. Aging at 165°C induced notable changes, with precipitate formation causing a 30% reduction in elongation and a 3.6% increase in ultimate tensile strength (UTS), attributed to precipitation hardening and improved bonding. At 175°C, mechanical properties further improved, with a 16% increase in yield strength (YS) and up to a 7.7% rise in UTS. The higher temperature facilitated greater precipitate formation, as confirmed by microstructural analysis, enhancing joint strength. However, this improvement came at the cost of ductility, with a 39.3% reduction in elongation due to restricted dislocation movement caused by the precipitates. Thermal conductivity variations in the welded plates influenced heat distribution and precipitate formation during aging. The process also reduced residual stresses from welding, enhancing diffusion and metallic bonding. Overall, artificial aging improved strength and stiffness but significantly decreased ductility, with aging at 175°C yielding optimal mechanical performance despite the trade-off in ductility.

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Periodical:

Materials Science Forum (Volume 1164)

Pages:

3-13

DOI:

https://doi.org/10.4028/p-lO82BF

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Online since:

November 2025

Authors:

Atif Shazad, Muhammad Shees Adil Siddiqui, Areeba Latif, Fahmee Maqsood Awan, Syed Muhammad Jawwad Ali*

Keywords:

Artificial Aging, Ductility, Microstructure, TIG, UTS

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