The ultra-fine structure formation is considered to be due to the very large plastic shear strain caused by sliding friction. In the present work, sliding friction tests of pin-on-disc type were carried out, and the microstructure and hardness near the sliding surfaces were investigated.
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This research demonstrates the use of submerged friction stir processing (SFSP) as an alternative and improved method for creating ultra-fine-grained bulk materials through severe plastic deformation.SFSP is compared with friction stir processing (FSP) done in air, through the use of thermocouples and transmission electron …
5.2.1 Polytetrafluroethylene ultrafine powder. PTFE ultrafine powder can be prepared by irradiation at room temperature, followed by ultrafine grinding. Fresh PTFE material, scrap or recycled PTFE waste, etc., can be used to fabricate ultrafine powder. The use of recycled PTFE or waste to produce ultrafine powder can reduce the cost and achieve ...
The microstructure of the MAZ comprises ultra-fine grains, ultra-fine second phases, and uniformly mixed α and β grains. The study's findings suggest that maelstrom flow can be used to create a uniform microstructure with ultra-fine grains, resulting in uniform deformation and improved the ductility in the interface region of the FSW/FSPed ...
Ten-millimeter-thick strain-hardened AZ31B-H24 magnesium sheets were subjected to friction stir processing (FSP) in air and submerged friction stir processing (SFSP) under water to investigate their microstructures and microhardness properties. Different rotational speeds of 500, 630, 800, and 1000 rpm and traverse speeds of 50, …
The mechanical properties of commercially pure titanium can further be improved through the grain refinement processes; however, welding fine-grained materials is challenging due to the grain coarsening in the weld area and hence the weakening of the mechanical properties locally. Meanwhile, friction stir welding is a promising process in …
DOI: 10.1016/J.MSEA.2017.05.065 Corpus ID: 135919700; Fabrication of a high strength ultra-fine grained Al-Mg-SiC nanocomposite by multi-step friction-stir processing @article{Khodabakhshi2017FabricationOA, title={Fabrication of a high strength ultra-fine grained Al-Mg-SiC nanocomposite by multi-step friction-stir processing}, author={Farzad …
The friction coefficient of the composites increased over unfilled PTFE from roughly 0.12 to 0.22, at filler concentrations of 10 wt.%, the wear resistance improved by almost two orders of magnitude as compared to the unfilled PTFE. ... The ultra-fine kaolin particulates are potentially interesting in providing low production cost for commodity ...
Il est utilisé pour rectifier une surface, permettant d'avoir un objet à surface très fine avec des dimensions très précises. La rectifieuse permet de retrouver une pièce à surface plane ...
The process involved with an ultra -fine friction grinder or known as "super mass colloider (SMC)" without using any chemical treatments or reagents. The ultra-fine particles …
This research demonstrates the use of submerged friction stir processing (SFSP) as an alternative and improved method for creating ultra-fine-grained bulk materials through severe plastic deformation. SFSP is compared with friction stir processing (FSP) done in air, through the use of thermocouples and transmission …
The FSS samples subjected to solution treatment, which was followed by an aging process, obtained an ultra-fine-grained structure of about 3.5 µm and resulted in higher hardness values of 121 ± ...
Severe plastic deformation via equal-channel angular pressing was shown to induce characteristic ultra-fast diffusion paths in Ni (Divinski et al., 2011). The effect of heat treatment on these paths, which were found to be represented by deformation-modified general high-angle grain boundaries (GBs), is investigated by accurate radiotracer self …
Reducing friction and wear has long posed a challenge for metallic components under dry sliding conditions. This study unveils a significant reduction in …
Friction-induced ultra-fine grain (UFG, grain size between 100 and 1000 nm) and NC structures on metal surfaces in dry sliding have been reported in [15], where NC grains of 30-50 nm were ...
Abstract. We investigated the corrosion behavior of commercially pure (CP) Ti with both ultrafine-grained (UFG) and coarse-grained (CG) microstructures. It was found that the UFG Ti is more resistant to corrosion than its CG counterpart. The superior corrosion resistance of UFG Ti is believed to result from rapid passivation of UFG Ti and …
A common pin-on-disc method as shown in Fig. 1 was employed in sliding friction tests. A pin, 5. mm in diameter (the diameter of the contact area was 2 mm) and 16 mm in length, was loaded on a rotating disc, which had a diameter of 60 mm and a thickness of 5 mm.. The materials used for the pin and disc specimens were 0.45 mass% …
Ultra-fine grained AA6061 coating was fabricated on the Q235 substrate by friction surfacing (FS). The grains of the coating were highly refined and equaixed due to the continuous dynamic recrystallization, and the precipitations were well-redistributed. As a result, the grain size and the fraction of low angle boundaries significantly declined.
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The microstructures of the above zones were carefully characterized. Based on the SEM, EBSD and TEM images (Fig. 1 (a)–(c) and Fig. 2 (a)), the PM presented multi-phase ultra-fine structures including ferrite (F), retained austenite (RA, fcc structure with red color in Fig. 1 (b)) and martensite (M).The inverse pole figure (IPF) map of Fig. 1 (c) …
Practical Application This research shows that ultra‐fine friction grinding (UFFG) has great potential for the development of turmeric suspensions. The results have applications in the food ...
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9.DA Series S. The D-A ULTRA-FINE pad is designed for high gloss finishing and polishing on haze-prone or very soft paint surfaces. It can also be used for the application of sealants or waxes. Pair the D-A Ultra-fine pad with UNO PURE Universal Polish to remove extremely fine defects or to bring out a show car level finish.
@article{Jiang2024ObtainingUA, title={Obtaining ultra-fine and uniform two-phase structures: Evolution of morphology and phase redistribution in a dual-phase Mg–Li alloy during submerged friction stir processing}, author={Luyao Jiang and Yanfei Bai and Wen Jiang and Fei Guo and Weijiu Huang and Fangjun Wang and Linjiang Chai and Xianhua …
Trouvez facilement votre rectifieuse parmi les 1 373 références des plus grandes marques (Satisloh, HARDINGE, Studer, ...) sur DirectIndustry, le spécialiste de l'industrie pour vos …
ABSTRACT. In this work, we evaluated the extraction of nanocellulose from agro-industrial residue of yerba mate (YM, Ilex paraguariensis, St.Hil) sticks through chemical (bleaching and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation), physical (steam explosion) and mechanical (ultra-fine friction grinding) treatments, …
Practical Application This research shows that ultra‐fine friction grinding (UFFG) has great potential for the development of turmeric suspensions. The results have applications in the food ...
An ultrafine microstructure consisting of α grains (~ 0.51 µm) and a small amount of β phase was successfully achieved in a friction stir-processed (FSPed) Ti-6Al …
Effect of heat treatment on diffusion, internal friction, microstructure and mechanical properties of ultra-fine-grained nickel severely deformed by equal-channel angular pressing Author links open overlay panel Sergiy V. Divinski a, Gerrit Reglitz a, Igor S. Golovin b, Martin Peterlechner a, Rimma Lapovok c, Yuri Estrin c d, Gerhard …
The effect of friction stir processing (FSP) on the microstructure and mechanical properties of a magnesium alloy AZ91 has been analyzed. The control of the heat sink and sample temperature allows for FSP samples of good quality, enhancing the grain size refinement in the stirred zone down to values close to 0.5 μm after a second …
In this work, the microstructure and mechanical properties of die-cast AZ91D were modified using low-temperature friction stir processing. A fine-grained structure was obtained in the stir zone ...
An ultrafine microstructure consisting of α grains (~ 0.51 µm) and a small amount of β phase was successfully achieved in a friction stir-processed (FSPed) Ti-6Al-4V alloy. The fraction of high angle grain boundaries (HAGBs) with random crystallographic orientations reached 89.3% revealed that dynamic recrystallization was responsible for …
Les rectifieuses fines double face utilisent des abrasifs fixes au lieu d'abrasifs libres pour la finition de précision. Selon l'application, la technologie de la rectification fine utilise un …
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Trouvez facilement votre rectifieuse portable parmi les 34 références des plus grandes marques (Hensgrand Instrument, ...) sur DirectIndustry, le spécialiste de l'industrie pour …