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 paper, the flow behavior in friction stir processing of metals is investigated by tracking the motion of discrete particles and grid deformation in a plasticine workpiece, where the forward motion of the tool is stopped nearly instantaneously to freeze the flow of material around the tool.
32 citations
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TL;DR: In this article, the secondary solid-state friction stir processing of the as-cast Mg-10%B4C composite with a flowenhancing double-pin tool was carried out and the ensuing result was compared with that of a single pin tool.
Abstract: Large and irregular particle sizes of B4C in the Mg matrix are performance-impeding challenges of the as-cast Mg-B4C composites. In an attempt to overcome this, the secondary solid-state friction stir processing of the as-cast Mg-10%B4C composite with a flow-enhancing double-pin tool was carried out and the ensuing result was compared with that of a single-pin tool. The microstructure, hardness, tensile strength, wear, and the fractured surface of the processed composites were investigated and compared. The extra pin-shearing effect and the complex pin-induced interactive material flow of the double-pin tool induce better refinement of the B4C particles in the Mg-10%B4C composite. The use of a double-pin tool increases the stirred and recrystallized vortex/swirl width, kernel average misorientation (KAM) fraction, dislocation density, hardness value at the stirred center (117 HV), and tensile strength (194 MPa) of the Mg-10%B4C composite as compared to the single-pin tool. The double-pin tool changes the fracture path of the composite away from the stirred center owing to the improved material flow and properties of the stirred center. The tribological properties (weight loss, wear rate, and coefficient of friction) of the processed composites are equally improved by the double-pin tool. A double-pin tool is thus recommended for the improvement of material flow, particle-disintegration, mechanical and tribological properties of Mg-based metal matrix composite.
32 citations
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TL;DR: In this article, internal strain profiles in friction-stir processed aluminum-alloy plates were investigated using neutron diffraction, and three different specimens were prepared with a purpose of separating the effects of frictional heating and severe plastic deformation on the internal strain distribution.
Abstract: Internal-strain profiles in friction-stir processed aluminum-alloy plates were investigated using neutron diffraction. Three different specimens were prepared with a purpose of separating the effects of frictional heating and severe plastic deformation on the internal-strain distribution: (Case 1) a plate processed with both stirring pin and tool shoulder, (Case 2) a plate processed only with the tool shoulder, and (Case 3) a plate processed only with the pin. The comparison between Cases 1 and 2 shows distinctly different strain profiles revealing deconvoluted effects of the different sources (i.e., heat, deformation, or the combination) on the internal strains generated during the friction-stir processing.
32 citations
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03 Jul 2020-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, a detailed experimental investigation of selected material systems together with a review of the reported data in the literature to establish an empirical correlation between indentation hardness and tensile strength in friction stir processed alloys and nanocomposites was performed.
Abstract: Friction stir processing (FSP) is a well-established surface modification technique for the production of ultra-fine grained alloys and metal-matrix nanocomposites. In this context, the main goal of implementing FSP is typically for improving surface properties such as indentation hardness and wear resistance. However, the tensile behavior of modified surfaces is also essential for some specific applications, although rarely reported. Therefore, the main object of this article is to perform a detailed experimental investigation of selected material systems together with a review of the reported data in the literature to establish an empirical correlation between indentation hardness and tensile strength in friction stir processed alloys and nanocomposites. Results indicate a consistent relationship between the properties of the modified alloys and the grain refinement following FSP. Accordingly, two general correlations can be made between yield stress (YS) and ultimate tensile strength (UTS) versus the indentation hardness (HV) with proportionality constants of ~1.69 and 3.36, respectively. Meanwhile, it is not possible to offer a general linear correlation between hardness and tensile strength for metal-matrix nanocomposites, mainly due to the structural heterogeneity related to the type and content of reinforcing agents. The statistical analysis of data revealed only an approximate correlation of ~1.23 between YS and HV.
32 citations
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TL;DR: In this paper, friction stir processing of the cast nickel aluminum bronze (NAB) alloy (C95500) and fabrication of graphite reinforced surface composite by means of FSP route have been carried out.
32 citations