Global and Local Mechanical Properties and Microstructure of Friction Stir Welds with Dissimilar Materials and/or Thicknesses

Global and Local Mechanical Properties and Microstructure of Friction Stir Welds with Dissimilar Materials and/or Thicknesses

Zadpoor, A.A.
Sinke, J.
Benedictus, R.

Mechanical, Maritime and Materials Engineering

Materials Science and Engineering

2010-12-01

This article studies the properties of a wide range of friction-stir-welded joints with dissimilar aluminum alloys or thicknesses. Two aluminum alloys, namely, 2024-T3 and 7075-T6, are selected for the study and are welded in ten different combinations of alloys and thicknesses. The welding parameters are optimized for each configuration, and a systematic study of the effects of material and thickness combinations on the microstructural features, global and local mechanical properties, and fracture mechanisms of the welds is carried out. It is shown that dissimilar alloys are extruded into each other, the texture is heterogeneous in the weld zone, and that there is no significant diffusion of alloying elements between the alloys. For most configurations, the local and global mechanical properties decrease as the thickness ratio increases. The local yield strength and plasticity parameters substantially vary next to the weld centerline, hence requiring their implementation in finite element method (FEM) models. Machining to obtain a constant thickness significantly influences the mechanical properties of the welds. The fracture mechanism is found to be a mixture of ductile and brittle fractures and to qualify as ‘‘quasi-cleavage.’’

http://resolver.tudelft.nl/uuid:9f3f5b65-7ddc-4280-8f2a-cc726ade8cd8

https://doi.org/10.1007/s11661-010-0403-3

Springer

3365-3378

http://www.springerlink.com/content/p45060g627158g25/

METALLURGICAL AND MATERIALS TRANSACTIONS A, VOLUME 41A, December 2010

Institutional Repository

journal article

(c) 2010
Zadpoor, A.A.
Sinke, J.
Benedictus, R.