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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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25 Jun 2010-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, a commercial 2219Al-T6 alloy plate was FSPed at a rotation rate of 400 rpm and a traverse speed of 100 mm/mm n in water and air, with average grain sizes of 1.0 and 2.1 mu m, respectively.
Abstract: Commercial 2219Al-T6 alloy plates were friction stir processed (FSPed) at a rotation rate of 400 rpm and a traverse speed of 100 mm/mm n in water and air, producing two fine-grained 2219Al samples with average grain sizes of 1.0 and 2.1 mu m, respectively. The 1.0 and 2.1 mu m-2219Al retained fine-grained microstructure during annealing treatment at temperatures up to 400 and 425 degrees C, respectively, above which abnormal grain growth occurred. Superplasticity was observed in 1.0 mu m-2219Al within the medium temperature range of 350-425 degrees C and a maximum ductility of 450% was obtained at 400 degrees C and 3 x 10(-4) s(-1). Increasing the grain size from 1.0 to 2.1 mu m resulted in a slight increase in the thermal stability, but did not enhance the superplasticity of the FSP 2219Al. The relatively low superplasticity in the FSP fine-grained 2219Al was attributed to unstable grain structure because the pining Al(2)Cu particles were easily coarsened at high temperatures. (C) 2010 Elsevier B.V. All rights reserved.
28 citations
TL;DR: In this article, the microstructure of Rutile (TiO2) particle-reinforced aluminum matrix composites were studied using conventional and advanced characterization techniques. But, the results showed that a drop in tensile strength was observed at a higher particle content due to cluster formation.
Abstract: Rutile (TiO2) particle-reinforced aluminum matrix composites were prepared by friction stir processing. The microstructure was studied using conventional and advanced characterization techniques. TiO2 particles were found to be dispersed uniformly in the composite. Clusters of TiO2 particles were observed at a higher particle content of 18 vol%. The interface between the TiO2 particle and the aluminum matrix was characterized by the absence of pores and reactive layer. Sub-grain boundaries, ultra-fine grains and dislocation density were observed in the composites. TiO2 particles improved the mechanical properties of the composites. However, a drop in tensile strength was observed at a higher particle content due to cluster formation. All the prepared composites exhibited ductile mode of fracture.
28 citations
TL;DR: In this paper, a single pass friction stir processing (FSP) was used to convert the coarse as-cast structure to the fine-grained structure with a grain size of 2.5-3.2 μm.
Abstract: Cast 7075Al alloys under as-cast and homogenized conditions were subjected to single-pass friction stir processing (FSP). FSP converted the coarse as-cast structure to the fine-grained structure with a grain size of 2.5–3.2 μm. A pre-homogenization prior to FSP was beneficial to the generation of a more uniform microstructure in the FSP sample with smaller particles and grains. Both FSP samples exhibited high strain rate superplasticity at 1 × 10−2 s−1 and 450 °C. Cavitation developed at the particles and the grain triple junctions. The superplasticity of the FSP sample was significantly improved by the pre-homogenization prior to FSP, with a maximum superplasticity of 890% being observed, due to reduced particle size. The analyses of the superplastic data and scanning electronic microscopic (SEM) examinations indicated that grain boundary sliding is the main deformation mechanism for the FSP 7075Al.
28 citations
TL;DR: In this article, the feasibility of simultaneous fabrication of composites on the top and bottom sides of the workpiece using B4C reinforcement particles into Al 6061 alloy was successfully studied.
Abstract: A novel material processing approach using the bobbin tool technique called bobbin tool friction stir processing (BTFSP) was developed to simultaneously fabricate two-side composites. The feasibility of simultaneous fabrication of composites on the top and bottom sides of the workpiece using B4C reinforcement particles into Al 6061 alloy was successfully studied in the present paper. Excellent dispersion of the B4C particles obtained at the bottom side of the workpiece by this technique. The metallurgical investigation of Al 6061/B4C double side composites was carried out using optical and scanning electron microscopy. The mechanical properties include sliding wear behavior, and microhardness of the fabricated composites was studied in detail. The results indicated a more uniform distribution of B4C particles with 3 passes. The grain refinement and homogeneous distribution of the B4C significantly improved microhardness and wear properties of the fabricated composites compared to as-received Al.
28 citations
TL;DR: In this article, a variant of friction stir processing assisted by electric current for the production of surface composites in aluminium, reinforced with alumina particles was presented, and the main objective was to improve the overall material surface reinforcing process by using this variant.
28 citations