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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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TL;DR: Transmission electron microscopy (TEM) examinations confirm that grain refinement is attributed to continuous dynamic recrystallization both for NFSP and SFSP.
Abstract: Hot-rolled AZ31 (Mg-2.57Al-0.84Zn-0.32Mn, in mass percentage) magnesium alloy is subjected to friction stir processing in air (normal friction stir processing, NFSP) and under water (submerged friction stir processing, SFSP). Thermal history of the two FSP procedures is measured, and its effect on microstructures and mechanical properties of the experimental materials is investigated. Compared with NFSP, the peak temperature during SFSP is lower and the duration time at a high temperature is shorter due to the enhanced cooling effect of water. Consequently, SFSP results in further grain refinement, and the average grain size of the NFSP and SFSP specimens in the stir zone (SZ) are 2.9 μm and 1.3 μm, respectively. Transmission electron microscopy (TEM) examinations confirm that grain refinement is attributed to continuous dynamic recrystallization both for NFSP and SFSP. The average Vickers hardness in the SZ of the NFSP and SFSP AZ31 magnesium alloy are 76 HV and 87 HV. Furthermore, the ultimate tensile strength and the elongation of the SFSP specimen increase from 191 MPa and 31.3% in the NFSP specimen to 210 MPa and 50.5%, respectively. Both the NFSP and SFSP alloys fail through ductile fracture, but the dimples are much more obvious in the SFSP alloy.
58 citations
TL;DR: In this article, annealing twin boundaries were successfully introduced into the ultrafine grains in FSP Cu-15Al (at.%) alloy, resulting in superior strength-ductility synergy with a yield strength of ∼700 MPa and a uniform elongation of ∼13%.
57 citations
01 Jul 2013-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, a relatively uniform dispersion and an ultra-refined average size of the introduced TiC reinforcements were obtained, and the reinforcement behaviors of dispersion were investigated in consideration of the plasticized Ti-matrix material-flow characteristics during FSP.
Abstract: After the process optimization experiments according to a series of principles stated in the paper, the TiC particle-reinforced surface composites were successfully fabricated via friction stir processing (FSP) method on the Ti–6Al–4V alloy substrates, using a surface-reservoir reinforcement placement method for embedding TiC powder into the substrate. A relatively uniformed dispersion and an ultra-refined average size of the introduced TiC reinforcements were obtained. The reinforcement behaviors of dispersion and refinement were investigated in consideration of the plasticized Ti-matrix material-flow characteristics during FSP. Nano-sized martensite-α′ phase and ultra-refined TiC particles were found in the TiC p /Ti–6Al–4V surface composites. The average micro-hardness of the produced surface composites was 680Hv 0.2 . The thicknesses of hardening surface layer with the hardness upon 650Hv 0.2 reached 900 μm. It was further discussed on the hardening mechanisms including ceramic particle strengthening, nano-sized refinement pinning effect and matrix martensite-α′ influence.
57 citations
TL;DR: In this article, the texture changes in friction stir-processed (FSP) 6061-T6 aluminum alloy plates were investigated using time-of-flight neutron diffraction.
57 citations
TL;DR: In this paper, normal friction stir processing (NFSP) was used to refine the grain size and enhance the tensile properties of AZ91 casting alloy, and the average grain sizes of the NFSP and SFSP alloys are 8.4 ± 1.3 and 2.8 ± 0.8 µm, respectively.
57 citations