Relationship between microstructure and nanomechanical properties in Dissimilar Friction- Stir- Welded AA6061-T6 aluminum alloy and AISI 316 stainless steel

Shehbaz, Tauheed, Junaid, Massab, Khan, Fahd, Zaigham, Hamid and Haider, Julfikar ORCID: https://orcid.org/0000-0001-7010-8285 (2023) Relationship between microstructure and nanomechanical properties in Dissimilar Friction- Stir- Welded AA6061-T6 aluminum alloy and AISI 316 stainless steel. In: Reference Module in Materials Science and Materials Engineering. Elsevier. ISBN 9780128035818

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Abstract

Friction- stir- welding (FSW) has emerged as a unique joining method to weld dissimilar materials (DMs). The objective of the present study is to investigate the evolved microstructure, surface hardness (H), and elastic moduli (E) in different weld- regions of the FSW butt welded aluminum alloy (AA6061-T6) and stainless steel (AISI 316). The results revealed that the welding process softened the Al alloy in the stir zone and produced significant hardness in the steel because of recrystallization, dissolution of precipitates and the formation of extremely fine equiaxed grains in the weld nugget. The % elastic recovery from load -displacement curves showed elastic to plastic deformation to a depth of <400 nm.