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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 article, the current research and development in aluminium alloy 6061titanium carbide based composites by different processing techniques with special focus on in situ and ex-situ stir casting route.
31 citations
05 Jan 2017-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, an Al-Zn-Mg-Cu, Al 7075, alloy in an overaged state was subjected to friction stir processing (FSP) using a wide range of processing conditions.
Abstract: An Al-Zn-Mg-Cu, Al 7075, alloy in an overaged state was subjected to friction stir processing (FSP) using a wide range of processing conditions. The goal was to diminish the heat index, increasing therefore the processing severity. Additionally, two backing anvils were selected that strongly influence the heat extraction rate. Grain sizes obtained by transmission electron microscopy were situated in the range 210–820 nm. High temperature tensile tests and the scanning electron micrographs of the topography of the tensile samples after testing revealed that grain boundary sliding (GBS) operated at an initial strain rate of e =10−2 s−1 in a wide range of temperatures for the processed alloy. That temperature window was wider and situated at lower temperatures for the finer grain sizes. The high processing severity imposed to create such fine microstructures introduces high values of stored energy in the material, which is the driving force for the increasing grain coarsening at high temperatures. This fact limited the operation of GBS at the highest tested temperatures in some conditions. An optimum balance between grain refinement and microstructural stability was obtained using a low heat index, corresponding to the processing conditions of ω=1000 rpm, V =500 mm/min, and the use of refrigerated backing anvil.
31 citations
07 Apr 2020-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, an ultrafine Mg-9Li-1Zn alloy with average grain sizes of 0.61 and 0.96μm was obtained by friction stir processing.
Abstract: Ultrafine Mg–9Li–1Zn alloy with average grain sizes of ~0.61 μm (α phase) and ~0.96 μm (β phase) was obtained by friction stir processing. A pronounced superplasticity from 369% to 1104% was obtained at 473 K over a wide range of strain rates from 10-1/s to 10-4/s.
31 citations
TL;DR: In this paper, the additive friction stir processing (AFSP) was used to construct a layer-by-layer 7'mm-thick 3D structure from pure aluminium powder on an aluminium substrate.
31 citations
30 Sep 2016-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the efficiencies of equal channel angular pressing (ECAP) and friction-stir processing (FSP) for grain refinement in an Al-Mg-Sc alloy were directly compared.
Abstract: The efficiencies of equal channel angular pressing (ECAP) and friction-stir processing (FSP) for grain refinement in an Al-Mg-Sc alloy were directly compared. Based on detailed microstructural examinations, microstructure-strength relationships for both processing techniques were quantified. In contrast to ECAP, the fine-grained material produced by FSP was found to be characterized by a coarser grain- and dispersoid size, lower dislocation density, more irregular texture, higher high-angle boundary fraction and lower strength. The comparatively low efficiency of FSP for grain refinement and enhancement of strength was attributed to the relatively high processing temperature and the relatively low cooling speed.
31 citations