Topic
Friction stir processing
About: Friction stir processing is a research topic. Over the lifetime, 2977 publications have been published within this topic receiving 62158 citations.
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TL;DR: In this article, an alternate solution of laser metal deposition of Al 7050 alloy powder coated with nickel was presented, where the added nickel was partially segregated in the inter-dendritic boundaries and formed brittle Al 3 Ni intermetallics.
34 citations
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01 Jul 2019TL;DR: In this article, the experimental results of TIG, FSW and (TIG + FSP) welded joint were compared and fine grain structure was observed in TIG welding.
Abstract: Tungsten inert gas welding is the most commonly used process for joining of aluminum alloy, which are highly demanded in aerospace application. In this process coarse grain structure, micro crack and porosity was obtained due to persisting thermal conditions when the fusion zone start to solidify. The formation of these defects on the weld region will result in reduction of weld strength about to half the parent material. To avoid these defects the top surface of gas tungsten arc welding are processed using friction stir processing up to certain depth from the top of the welds. Friction stir processing destroyed the coarse grain dendritic structure in the tungsten welded joint, because of change in grains refinement and microstructure significantly improved the hardness of the friction stir processing (FSP) weld over the base metal and TIG weld. In this study, we compared the experimental result of TIG, FSW and (TIG + FSP) welded joint. Coarse grain structure was observed in TIG welding and fine grain structure was observed in FSP process. In addition very fine grain structure we observed in stir zone due to the effect of intense plastic deformation and temperature during TIG + FSP.
34 citations
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TL;DR: In this article, the effects of the size and morphology of the reinforcement particles on hardness and tribological behaviors of the AZ31 Mg alloy matrix composites were studied, where different ceramic compounds, including boron carbide, tungsten carbide (WC), and Zirconia (ZrO2), were selected as the reinforcement materials for developing mono composites.
34 citations
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26 Aug 2015-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, a fine-grained Mg-Y-Nd alloy with an average grain size of 1.3μm and small second phases of 280nm was prepared by submerged friction stir processing (SFSP).
Abstract: In this study, a fine-grained Mg–Y–Nd alloy with an average grain size of ~1.3 μm and small second phases of ~280 nm was prepared by submerged friction stir processing (SFSP). Microstructure evolution and superplastic behavior of Mg–Y–Nd alloy processed by SFSP was investigated in the temperature ranges of 683–758 K and the strain rate ranges from 2×10−2 to 4×10−4 s−1. Due to the fine-grained and stable microstructure, excellent high strain rate superplasticity (HSRS) of 900% was achieved at 758 K and 2×10−2 s−1, and the maximum elongation of 967% was obtained at 733 K and 3×10−3 s−1. Because of the good deformation compatibility, cavities were easily formed at the grain boundaries instead of the interface between particles and matrix. Grain boundary sliding accommodated by lattice diffusion was the dominated deformation mechanism during superplastic deformation.
34 citations
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28 Jan 2019-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, texture variations and mechanical properties were investigated during constrained groove pressing (CGP) and subsequent friction stir processing (FSP) with different volume fractions of SiC nanoparticles.
Abstract: Annealed 1050-aluminum sheets were severely deformed at the strain magnitude of 2.32 through constrained groove pressing (CGP) process. Texture variations and mechanical properties were investigated during CGP and subsequent friction stir processing (FSP) with different volume fractions of SiC nanoparticles. The results revealed that the predominant texture component in the annealed aluminum was { 001 } 〈 100 〉 cube texture. After CGP, deformed and shear texture components developed while the cube texture was partially remained. In the specimen undergone FSP without nanoparticles, { 001 } 〈 110 〉 rotated cube and nearly { 001 } 〈 110 〉 shear texture component C were mainly pronounced, which was indicative of shear deformation of material in the stir zone. Orientation distribution function analysis from the stir zone demonstrated variations in the texture development with the incorporation of SiC nanoparticles. An increase in the fraction of nanoparticles changed the grain orientation in such a way that the { 001 } 〈 110 〉 shear texture component C gradually developed from the rotated cube texture. However, the overall texture intensity became weaker by increasing the fraction of SiC nanoparticles due to the activation of particle stimulated nucleation mechanism forming randomly oriented grains. The incorporation of SiC nanoparticles in the stir zone also enhanced the yield strength, Young's modulus, and hardness of the stir zone without considerable reduction in the elongation. In such situation, Orowan strengthening was suggested as a dominant mechanism involved.
34 citations