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, surface composites were developed on the surface of AZ91 magnesium base alloy and SiC and Al2O3 particles were embedded separately in the surface and accordingly two kinds of composites are developed.
Abstract: Friction stir processing (FSP) has been applied to modify the surface characteristics of metals. Development of surface composites through FSP has been addressed by different research studies. During the process, generally hard particles are embedded in the soft matrix through stirring. In the current research, surface composites were developed on the surface of AZ91 magnesium base alloy. SiC and Al2O3 particles were embedded separately in the surface and accordingly two kinds of composites were developed. Different characteristics, namely mechanical, tribological, and corrosion behavior, were analyzed. The results showed that mechanical properties as well as strength, hardness, and ductility of FS-processed samples were higher than the as-received one. It was concluded that wear and corrosion resistance of FS-processed samples were higher than the as-received material. The results also indicated that by increment of pass number, the mechanical properties improved, corrosion resistance increased, and wear rate decreased. The results also showed that samples processed using SiC particles had better mechanical characteristics and corrosion resistance than samples processed using Al2O3 particles, although particle type did not have significant effect on wear rate.
67 citations
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TL;DR: A steel/TiC nano-composite surface layer with ultra fine grains of less than 600nm was fabricated on mild steel substrate by introduction of nano-sized TiC powder into the stir zone employing four passes of friction stir processing as mentioned in this paper.
Abstract: A steel/TiC nano-composite surface layer with ultra fine grains of less than 600 nm was fabricated on mild steel substrate by introduction of nano-sized TiC powder into the stir zone employing four passes of friction stir processing. TiC clusters were formed after the first pass. Sequential break-up of clusters and refinement of matrix grains were caused by subsequent FSP passes. A near uniform dispersion of nano-sized TiC particles was achieved after the fourth pass. The fabricated nano-composite layer exhibited a maximum micro hardness value of ~ 450HV; this is much greater than 185 and 130HV of the friction stir processed layer without introduction of TiC powder and as-received substrates, respectively. Moreover, a significant improvement in wear resistance of the nano-composite layer was observed as compared with that of the as-received substrate. The enhanced properties are attributed to the uniform dispersion of hard nano-sized TiC reinforcements in a matrix of ultra fine dynamically recrystallized grains.
67 citations
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10 Mar 2013-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, three kinds of AZ31 plates with different initial grain orientations were friction stir processed (FSP), and detailed microstructure and texture evolutions of the FSP plates were obtained.
Abstract: Three kinds of AZ31 plates with different initial grain orientations were friction stir processed (FSP). Detailed microstructure and texture evolutions of the FSP plates were obtained. Fracture behavior and non-uniform plastic deformation were focused on. It was found that initial grain orientation had little effect on grain size and texture evolution in stir zone (SZ), but it greatly affected the texture transition at thermal–mechanical affected zone (TMAZ)/SZ interface. Non-uniform plastic deformation was observed in all the three kinds of FSP plates along the tensile direction. The strength difference of the FSP plates was largely reduced compared with the initial plates. Fracture consistently initiated in transition region on advancing side even for the 90° specimen, in which no sudden texture transition was present at TMAZ/SZ interface. As revealed in electron backscatter diffraction (EBSD) maps, SZ-side could be divided into two micro-regions. One was adjacent to TMAZ/SZ interface, named as the region of easy to activate extension twinning (EAET region), where the c -axis was almost parallel with transverse direction (TD). The other was slightly away from TMAZ/SZ interface, named as the region of easy to activate basal slip (EABS region), where the c -axis was tilted about 45° towards TD. The activation of different deformation mechanisms in SZ-side may cause plastic deformation incompatibility and initiate fracture. An “embossed” phenomenon appeared in SZ-center during the transverse tensile tests of all the three kinds of FSP plates, which was related to the distribution of basal plane and caused by the different deformation between SZ-center and SZ-side. The activation of basal slip in EABS region was considered as a major role in the formation of the “embossed phenomenon”. The findings of this study extend understanding the mechanism of fracture and inhomogeneous deformation behaviors of FSP Mg alloys.
67 citations
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TL;DR: In this article, the effect of tool plunge depth on pattern of reinforcement particles dispersion in metal matrix was investigated and six varying tool plunge depths were chosen at constant levels of shoulder diameter and tool tilt angle to observe the exclusive effect of plunge variation.
66 citations
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05 Aug 2020-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, a kind of novel Al matrix composite reinforced by Al08CoCrFeNi HEA particles was fabricated by multi-pass friction stir processing (FSP) to overcome the urgent demand of light-weight design.
Abstract: Metal matrix composites have been developed to overcome the urgent demand of light-weight design High entropy alloys (HEAs) are newly emerged as a new kind of potential reinforcement for metals due to their outstanding physical and mechanical properties Here, a kind of novel Al matrix composite reinforced by Al08CoCrFeNi HEA particles was fabricated by multi-pass friction stir processing (FSP) The incorporated HEA particles were homogeneously distributed into the composites and maintained the structural integrity The average grain size of the FSPed composites decreased from 46 μm of Al matrix to 28 μm due to the particle-stimulated nucleation mechanism The hardness, yield strength and ultimate tensile strength of the FSPed composites increased by 56%, 42% and 22% than that of the FSPed Al matrix with no obvious decrease of elongation Interfacial diffusion occurred and the interfacial region is confirmed to be the Al3CoCrFeNi rather than the intermetallic phases HEA particles have great potentials in mechanical properties enhancement for conventional light-weight alloys
66 citations