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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: In this paper, a polycrystalline cubic boron nitride (pcBN) tool and tool wear at different travel distances was investigated and the effect of tool wear on the microstructure and mechanical properties of the stir zone was evaluated.
42 citations
24 Mar 2017-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the authors investigated the microstructural evolution during multi-pass friction stir processing (FSP) of the as-cast ZrB2/6061Al nanocomposite and corresponding mechanical properties.
Abstract: Microstructural evolution during multi-pass friction stir processing (FSP) of the as-cast ZrB2/6061Al nanocomposite and corresponding mechanical properties were investigated. The initial sample was characterized by primarily micrometer-sized clusters of ZrB2 nanoparticles within the coarse dendrites. Multi-pass FSP successively broke these clusters, refined the matrix grains and finally produced a thoroughly homogeneous microstructure in the stirred zone (except for the upper layer). The process of cluster redistribution was found to be governed by material flow around the pin, wherein the actual stir or mixing driven particle dispersion only occurred in the thread grooves. Meanwhile, the pinning effect of ZrB2 nanodispersoids retarded grain growth following recrystallization and led to a further reduction in grain size. On the other hand, compared with the initial state, both the microhardness and tensile strengths of the FSPed composites were gradually enhanced with consecutive passes. These increases can be attributed to the combination effect of grain refinement and dislocation strengthening induced by uniform distribution of ZrB2 nanoparticles. Quantitative analysis in the 4-pass FSPed composite indicated that Orowan strengthening contributed the most to the yield strength.
42 citations
TL;DR: In this article, a single pass approach was adopted to investigate the effect of metal loss in cavities produced to incorporate reinforcements at the inter-cavity spacing of 8mm and 10mm.
42 citations
25 Apr 2014-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the effect of FSP pass number on the distribution of nanoparticles is investigated, and it is found that after 3 passes of the FSP, SiC nanoparticles are uniformly distributed leading to the prohibition of grain growth in the stir zone.
Abstract: The 1050 aluminum sheets are severely deformed by two passes of the constrained groove pressing (CGP) process to obtain the strain of 2.32. Friction stir processing (FSP) is then performed on these specimens at two conditions of with and without SiC nanoparticles. Microhardness measurements indicate that in the state of FSP without any particle, the microhardness of stir zone is decreased due to the recrystallization and grain growth occurrence because of high stored strain energy in the CGPed specimens. In order to enhance the mechanical properties of the stir zone, SiC nanoparticles are used during FSP. Also, the effect of FSP pass number on the distribution of nanoparticles is investigated. Microstructure investigations reveal that after 1 and 2 passes of FSP with SiC nanoparticles, specimens experience brittle fracture at the retreating side of the stir zone during transverse tensile test due to the presence of clustered nanoparticles in this region. However, it is found that after 3 passes of FSP, SiC nanoparticles are uniformly distributed leading to the prohibition of grain growth in the stir zone. This can be responsible for the improvement of stir zone microhardness by about 118.8% with respect to the specimen FSPed without nanoparticles.
42 citations
TL;DR: In this paper, the effects of multi-pass friction stir processing on the passive behavior and electrochemical response of pure Titanium in a phosphate buffer solution (pH = 10.69) were studied.
42 citations