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 …

The main characteristics of aluminum and its alloys. Aluminum is a multifaceted material with multiple uses, including as a matrix metal for composites. It has a silvery white appearance and is used as either a pure metal or as an alloy. It is extremely light and just small amounts of alloying elements can increase its strength.

The ultrafine grinding process can result in highly damaged starch, which hydrates easily and is more susceptible to enzymatic hydrolysis (Sun et al., 2007). Furthermore, the ultrafine grinding technique can affect the thermal characteristics of flour/starch, as the starch granular structure changes.

Five different ultrafine milled flours (UMFs) were prepared from Tartary buckwheat via airflow ultrafine-grinding at different grinding pressures. The airflow ultrafine-grinding resulted in marked differences in particle size (from 100 to 10 μm). The UMFs were all brighter in appearance (higher L*) than Tartary buckwheat common flour …

Semantic Scholar extracted view of "Effect of the process control agent in the ball-milled powders and SPS-consolidation temperature on the grain refinement, density and Vickers hardness of Fe14Cr ODS ferritic alloys" by V. Mihalache et al.

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 ...

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 …

This chapter provides a review of the processing techniques based on severe plastic deformation (SPD), namely high pressure torsion and equal channel angular pressing, as applied to age-hardenable and non age-hardenable Al alloys.

Alloys for TEM were mechanically grinding to a thickness of ~50 μm using SiC grinding paper from 800 to 3000 grit, followed by twin-jet electropolishing in a mixture 30% nitric acid and 70% methanol at −30 °C with a working voltage of 20 V. Observations were carried out on a JEOL 2100 F operating at 200 kV. ... Ultrafine grained Al 7075 ...

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.

An ultrafine-grained (UFG) Al–Cu–Mg alloy (AA2024) was produced by surface mechanical grinding treatment (SMGT) with a high strain rate, and the precipitation behavior inside the grain and at the grain …

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 …

This work investigates the effect of ultrafine-grain microstructure on the oxidation behavior of AlCoCrFeNi high entropy alloy (HEA). The ultrafine-grain microstructure is obtained using stationary friction processing performed at two different rotational speeds, 400 and 1800 rpm, for 5 min duration. Processed samples demonstrate high depth of refinement …

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.

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 …

Chen et al. [8] showed for an oscillatory ball mill that the median particle diameter d 50 (and also other percentiles such as d10 and d90) were well fitted by Rittinger's model for the grinding of D-Lactose from 450 to 150µm. For experiments on spruce saw dust on the same type of mill, Karinkanta et al. [9] showed, however, that d 50

Bulk ultrafine grained (UFG)/nanocrystal metals possess exceptional strength but normally poor ductility and thermal stability, which hinder their practical applications …

This chapter provides a review of the processing techniques based on severe plastic deformation (SPD), namely high pressure torsion and equal channel angular …

As a crucial branch for titanium industry, high-strength titanium alloys (HS-TAs, with UTS ≥ 1100 MPa) are indispensable structural materials for advanced engineering applications such as aerospace and marine fields. Along with the expansion of HS-TAs' market, achieving satisfying synergies of high strength, high ductility (elongation ≥ 6%) …

in 7075 Al alloy. The two strengthening effects were understood from microstructural characteristic of the UFG 7075 Al alloy (G-P zone, grain size, dislocation density and …

The present literature review explores the energy-efficient ultrafine grinding of particles using stirred mills. The review provides an overview of the different techniques for size reduction and the impact of energy requirements on the choice of stirred mills. It also discusses the factors, including the design, operating parameters, and feed material …

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 ...

The aluminum (Al) alloys, with a low density and high strength, are the primary materials of choice for industrial applications such as in aircraft, where specific strength (i.e., strength-to-weight ratio) is a major design consideration [1,2,3].The high strength of heat-treatable Al alloys is mainly associated with the precipitation of excess …

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 …

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

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 ...

The work presented in this paper is part of a wide ranging study of the formation of ultra-fine grained microstructures in aluminum and ferrous alloys, and the …

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 ...

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 ...

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 ...

The Al 7××× series alloys have extensively been applied in automobile and aerospace structures and other high strength components owing to their high strength-to-weight ratio, and high thermal and electrical conductivity.1–3 It is well known that refining the grain structure to ultrafine grained (UFG) regime can further enhance the mechanical …