Effect of Ag interlayer on the microstructural properties and nanocreep behavior of Ti6Al4V/AA7075 dissimilar laser weldments

Iltaf, Asim ORCID: https://orcid.org/0009-0000-6947-5213, Barka, Noureddine et Dehghan, Shayan (2024). Effect of Ag interlayer on the microstructural properties and nanocreep behavior of Ti6Al4V/AA7075 dissimilar laser weldments. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications . pp. 1-14.

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Résumé

Creep failure poses a potential risk in dissimilar welded joints between aluminum and titanium alloys, potentially compromising the joint's integrity. This study utilizes laser beam welding (LBW) to achieve dissimilar joining of AA7075 and Ti6Al4V by incorporating an Ag interlayer. The role of Ag interlayer for dissimilar joining of AA7075 and Ti6Al4V alloys and its impact on the microstructure and nanocreep behavior of joints is examined. The findings showed that the use of Ag decreased the interaction of Ti/Al considerably with each other which led to a reduction in the formation of brittle intermetallic compounds. The nanohardness and atomic force microscopy (AFM) results indicated that the Ti6Al4V HAZ exhibited the highest hardness and least plastic deformation, owing to the formation of α′ martensite. The nanoindentation creep analysis revealed the highest stress exponent value in Ti6Al4V HAZ, pointing to a dislocation climb creep mechanism. Additionally, the results also suggested that the observed creep mechanism might be attributed to both diffusional creep and dislocation climb for other zones. -- Keywords : Laser welding ; Interlayer ; Nanoindentation ; Nanocreep ; EDS ; AFM.

Type de document :	Article
Validation par les pairs :	Oui
Version du document déposé :	Version officielle de l'éditeur
Départements et unités départementales :	Département de mathématiques, informatique et génie
Déposé par :	DIUQAR UQAR
Date de dépôt :	25 avr. 2024 13:56
Dernière modification :	25 avr. 2024 13:56
URI :	https://semaphore.uqar.ca/id/eprint/2952

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