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, a 7075-T651 aluminium alloy was friction stir processed in order to improve superplastic behavior and the results showed that a strong influence of both temperature and initial strain rate on the test results was observed.
31 citations
TL;DR: In this paper, the effects of nano SiC particles on the β-Mg17Al12 phase precipitation at 180°C as well as the age hardening response of AZ91D were investigated by X-ray diffraction, optical microscopy, scanning electron microscopy (SEM) and transmission electron microscope (TEEM).
31 citations
TL;DR: In this paper, the thermal histories of the two FSP procedures are measured, and their effects on microstructure evolution and mechanical properties of the experimental materials are investigated, and the observed grain sizes of two Alloy Alloy specimens match well with the predicted values calculated by the Derby-Ashby model.
Abstract: AZ91 casting alloy is subjected to friction stir processing (FSP) in air (NFSP) and under water (SFSP). The thermal histories of the two FSP procedures are measured, and their effects on microstructure evolution and mechanical properties of the experimental materials are investigated. Compared with NFSP, the peak temperature during SFSP is about 150 °C lower and a much higher cooling rate of 13 °C/s is gained. Both NFSP and SFSP produce uniform recrystallized microstructures with dominant high-angle grain boundaries. The average grain size of the NFSP specimen is 7.8 μm, and SFSP results in further grain refinement with a grain size of 1.2 μm. The observed grain sizes of the two FSP specimens match well with the predicted values calculated by the Derby–Ashby model. TEM observation, temperature data, and model criterion indicate that the grain refinement mechanism during NFSP is attributed to continuous dynamic recrystallization (DRX), while continuous DRX and discontinuous DRX affect during SFSP. The mechanical properties of the SFSP alloy are much higher due to finer microstructure.
30 citations
TL;DR: In this article, the authors reported a novel in-situ method of fabricating nano-polymer derived metal matrix composite (PD-MMC) by friction stir processing (FSP) and addressed the issues of tool wear and particle agglomeration.
30 citations
TL;DR: In this paper, an Al-Zn-Mg-Cu, Al 7075 alloy was subjected to friction stir processing (FSP) using several processing conditions, two different backing anvils and three initial precipitation states to reach the maximum feasible processing severity to produce ultrafine grain sizes.
30 citations