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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 preparation processes of several ceramic particles reinforced copper-based composites are discussed, including three powder metallurgy processes as mechanical alloying, internal oxidation, and wet chemistry, as well as friction stir processing, reactive spray deposition and liquidus in situ reaction.
44 citations
08 Feb 2017-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In-situ Mg matrix composites are fabricated by combining both liquid-and solid-state processing routes as discussed by the authors, where liquid polymer was injected into the molten Mg at a temperature of 800-°C to initiate pyrolysis.
Abstract: In-situ Mg matrix composites are fabricated by combining both liquid- and solid-state processing routes. Firstly, liquid polymer was injected into the molten Mg at a temperature of 800 °C to initiate pyrolysis. In-situ pyrolysis aids in the conversion of liquid polymer into sub-micron sized SiCNO particles (mean particle size in the range of 0.5–1 µm) and Mg2Si particles. Most of the polymer derived SiCNO particles were pushed by the solidification front and as a result segregated at the grain boundaries of as-cast composites (mean grain size in range of 50–65 µm) during subsequent solidification process. Formation of Mg2Si phase could be minimized by reducing the pyrolysis temperature from 800 to 700 °C. Single pass friction stir processing (FSP) of these as-cast composites lead to improved homogeneity in the SiCNO particle distribution, particle refinement (mean particle size of about 200–300 nm) and grain refinement (mean grain size in range of 2.5–3.5 µm). Mechanical properties (hardness, compressive yield stress, ultimate compressive stress, strain to failure and strain hardening exponent) of the FS processed composites were enhanced significantly as compared to their as-cast counterparts. Strengthening mechanisms and numerical models are being evoked to explain the observed yield strength in these two stage processed composites.
44 citations
TL;DR: In this paper, the fabrication of Cu/WC composites by applying the 1-, 2-, and 4-pass friction stir processing was the main aim of present investigation, and the results indicated that the composites fabricated by this method had a good quality.
Abstract: The fabrication of Cu/WC composites by applying the 1-, 2-, and 4-pass friction stir processing was the main aim of present investigation. The results indicated that the composites fabricated by this method had a good quality. Increasing the pass numbers was also used to improve the dispersion of WC particles and consequently to intensify the mechanical properties of composite layers. The microstructural, mechanical, and thermophysical properties of the composites were used to confirm this claim. The grain size in these composites shows the promising reduction to the 1.2 μm in 4-pass friction stir processed one, and microhardness values reach to a considerable amount up to two times more than the pure copper. Wear rate and friction coefficient evaluation of the composites in different sliding rates demonstrated the composites resistance against weight loss and high reliability of the 4-pass friction stir processed composites in higher wear distances compared to that of fabricated by 1-pass. Moreover, the thermal expansions of the composites were examined up to 500 °C which is indicative of the composites stability in higher temperatures.
44 citations
TL;DR: In this article, friction stir processing (FSP) was used to disperse titanium particles into 5083 Al matrix to fabricate AMCs, and the effects of the external water on the microstructure and mechanical properties of FSPed AMCs were investigated.
44 citations
18 Jul 2016-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the effect of tool design on superplastic behavior of friction stir processed Al-Mg alloys has been investigated and four different tools were used and compared.
Abstract: Friction stir processing is one of the most efficient techniques for microstructure refinement and has a potential for enhancing the deformation behavior of metallic materials at elevated temperature. The design of the tool has been shown to play a decisive role in microstructure modification. In this work, the effect of tool design on superplastic behavior of friction stir processed Al-Mg alloys has been investigated. The alloy was friction stir processed at 400 rpm and 0.42 m/s. Four different tools were used and compared. The pin was right-handed screw type in all cases. Very fine microstructures with grain sizes less than 3 µm were obtained with all the tools. Abnormal grain growth was observed after high temperature exposure using some of the tools. Maximum tensile elongations in the range of 575–810% were achieved with three of the tools. The tool with a larger shoulder area allowed more plastic deformation on the microstructure generating a more suitable microstructure for high temperature deformation.
44 citations