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The effects of different strain levels applied through high-pressure torsion (HPT) deformation following annealing on the microstructural evolution, thermal stability, and mechanical properties of Al-4Mg-0.3Cu alloy were investigated. The results reveal that Cu-segregated grain boundaries (GBs) were generated in the ultrafine-grained Al-4Mg …
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This chapter provides a review of the processing techniques based on severe plastic deformation (SPD), namely high pressure torsion and equal channel angular …
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In this sense ultra-precision grinding is primarily used to generate high quality and functional parts usually made from difficult to machine materials. The aim of ultra-precision grinding processes is to generate parts with high surface finish, high form accuracy and high surface integrity. For example, such processes are applied for the ...
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The alloy system is not fully amorphous because the Al content is 95%, which is beyond the glass forming region for Al-based MGs (Al content of 80–90% 27). The formation of Al nanocrystals leads ...
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Titanium alloys, widely used in the aerospace, automotive and energy sectors, require complex casting and thermomechanical processing to achieve the high strengths required for load-bearing ...
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Jia et al. made the experiment on specific energy and surface roughness of minimum quantity lubrication grinding based on nickel alloy with mixed vegetable oil-based NFs. Based on the test conditions, it was found that soybean/castor mixed oil obtained the optimal results (μ = 0.379, U = 83.27 J/mm 3, and Ra = 0.325 μm) and …
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Ultrafine-grained Al–Zn–Mg–Cu alloy processed via cross accumulative extrusion bonding and subsequent aging: Microstructure and mechanical properties
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Additive manufacturing of ultrafine-grained high-strength titanium alloys D Z 1,6, D Q 1,6, M A. G 1,3, ... alloy. a, b,Backscatteredelectron(BSE)imagesoftheas-printedTi–8.5Cualloy
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Additive manufacturing of ultrafine-grained high-strength titanium alloys - Nature. ... The theory behind this project is based on the Interdependence Theory proposed by Prof David StJohn et al. (Acta Mater. 2011, 59, 4907). We also worked with some of the world's experts on Ti-alloys including Dr Mark Gibson from CSIRO and Prof Hamish …
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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 ...
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Before the surface mechanical grinding treatment (SMGT), alloy rods of 150 mm in length and 20 mm in diameter were solution treated at 540 °C for 6 h in vacuum followed by water quenching for obtaining supersaturated solid solution. ... Segregation of Cu along GBs was observed in an ultrafine grained Al–0.3 wt%Cu alloy prepared by …
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The degree of alloying of titanium alloys is getting higher and higher. Near-α titanium alloy has better strength and plasticity at high temperature, so it has always occupied a dominant position in high-temperature titanium alloy. Among the near-α titanium alloys, Ti–Al–Sn–Zr–Mo–Si series titanium alloys are most widely used.
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ultrafine-grained aluminium alloys to study the various dynamic failure conditions such as unpredictable crashes, high rate grinding and machining, explosive fragmentation and welding, etc. Further, these studies were helped in improving the high impact strength of Al alloys by analysing and inves-tigating the deformation mechanism.
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1. Introduction. FeCrAl alloy, one type of ferritic alloys with high Cr and Al contents, is one of the promising candidates for accident tolerant nuclear reactor applications [1], [2], [3], [4].The high-temperature (1000 – 1500°C) steam oxidation rate of FeCrAl alloys is two orders of magnitude lower than those of the currently used …
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It is a heat-treatable alloy involving zinc with smaller amounts of copper, magnesium, and other elements. It has high strength, good toughness, and excellent fatigue resistance. The alloys are used in aircraft and aerospace applications, as well as in high-performance sporting goods.
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For instance, Wang et al. [10] prepared Ti–Fe alloys with a combination of high strength and good ductility using elemental powders Fe and Ti. Zhang et al. [ 11 ] developed Ti–Cu alloys with both fine equiaxed prior-β grains and an ultrafine eutectoid lamellar structure by additive manufacturing, thereby contributing to promising ...
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Abstract. Additive manufacturing of aluminum alloys is largely dominated by a near-eutectic Al-Si compositions, which are highly weldable, but have mechanical properties that are not competitive ...
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Abstract. 1,2. As the grain size decreases beyond this point, the dominant mechanism of deformation switches from a dislocation-mediated process to grain boundary sliding, leading to material softening. In one previous approach, stabilization of grain boundaries through relaxation and molybdenum segregation was used to prevent this softening ...
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Mechanical alloying is a solid-state powder processing technique that involves repeated cold welding, fracturing, and rewelding of powder particles in a high-energy ball mill. Originally developed about 50 years ago to produce oxide-dispersion-strengthened Ni- and Fe-based superalloys for aerospace and high temperature …
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Aluminum and aluminum alloys are among the most used metals in fabrication, construction, and in the creation of good all around you. It is such a useful and versatile metal, but there are some special considerations you need to make when working with it. We have put together this expert guide to fabricating, grinding, and finishing …
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Bulk ultrafine grained (UFG)/nanocrystal metals possess exceptional strength but normally poor ductility and thermal stability, which hinder their practical applications …
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The significance of Al minor alloying was seen with the specific yield strength increasing from ~125 MPa·cm 3 /g in the CoNiV alloy to ~150.2 MPa·cm 3 /g in our Al 5 (CoNiV) 95 alloy. This opens the pathway for designing low-density high-strength alloys with potentially improved energy efficiency, which are in demand today.
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The high density of grain boundaries also generates high back stresses via piling up of massive dislocations, and the low cross-slip probabilities produce not only robust dislocation-mediated plasticity but also high back stress contribution to flow stress, which affords high strain-hardening capability to ultrafine-grain alloys, with 1.7 ...
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WebUltrafine grinding is used to liberate gold finely disseminated in metallic sulfides. KCGM is the first gold mine using ultrafine grinding followed by cyanidation (Ellis and Gao, 2002 ). …
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A coarse-grained (mean grain size 25 μm, denoted as sample CG) AZ31 alloy sheet with a dimension of 200 × 200 × 3 mm 3 was used as the workpiece for SFT processing, and the schematic illustration of SFT setup is presented in Ref. [ 27 ]. The chemical composition (at.%) of the AZ31 alloy was 2.69%Al, 0.38%Zn, 0.13%Mn, and …
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The work demonstrates the utilization of fractionalized lignin from the black liquor of soda pulping for the development of starch-lignin biocomposites. The effect of ultrafine friction grinding on lignin particle size and properties of the biocomposites was investigated. Microscopic analysis and membrane filtration confirmed the reduction of …
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Metallurgical and Materials Transactions B (2023) Additive manufacturing, often known as three-dimensional (3D) , is a process in which a part is built layer-by-layer and is a promising ...
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Alloy with nominal composition of Ni 32.8 Fe 21.9 Co 21.9 Cr 10.9 Al 7.5 Ti 5.0 (at.%), which can also be written as (Ni 1.5 FeCoCr 0.5) 87.5 Al 7.5 Ti 5.0, was prepared by arc-melting a mixture ...
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Abstract. Ultra-precision machining technologies are the essential methods, to obtain the highest form accuracy and surface quality. As more research findings are published, such technologies now involve complicated systems engineering and been widely used in the production of components in various aerospace, national defense, …
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A duplex, nano-scale Co-free high-entropy alloy (HEA) based on AlCrFe2Ni2 was processed using laser material deposition (LMD). Process parameters in various beam diameter configurations, as well as …
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