Global and Local Mechanical Properties and Microstructure of Friction Stir Welds with Dissimilar Materials and-or ThicknessesReport as inadecuate




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Metallurgical and Materials Transactions A

, Volume 41, Issue 13, pp 3365–3378

First Online: 22 September 2010

Abstract

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.-

Manuscript submitted September 15, 2009.

Electronic supplementary materialThe online version of this article doi:10.1007-s11661-010-0403-3 contains supplementary material, which is available to authorized users.

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Author: Amir Abbas Zadpoor - Jos Sinke - Rinze Benedictus

Source: https://link.springer.com/







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