Order-sintering of mechanically alloyed FeAl nanostructures

Ehtemam-Haghighi, Shima; Janghorban, K.; Izadi, S.

doi:10.1016/j.jallcom.2010.03.150

Cited by 11 publications

(6 citation statements)

References 19 publications

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“…Even though they show good strength and environmental stability, several defects were detected, such as poor ductility and toughness at room temperature, mediocre creep strength, as well as fabrication difficulties. Such deficiencies impose a great concern for their application as industrial structural materials [17,18], and several routes are proposed to improve it, i.e., (i) addition of alloying elements; (ii) reduction in grain size; (iii) disordering of the lattice, to improve the dislocation motion; and, (iv) modifying the crystal structure of the phase into a more symmetric; some of these effects can be achieved by mechanical alloying/milling [19,20].…”

Section: Introductionmentioning

confidence: 99%

Sliding Wear Behavior of Fe-Al Coatings at High Temperatures

et al. 2018

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The medium and high temperature tribological behavior of different iron aluminide thermal spray coatings was investigated. Several powders synthesized through different routes (ball milling, self-decomposition, and self-propagating high-temperature sintering (SHS)) were evaluated. High heterogeneity of conventional High Velocity Oxygen Fuel (HVOF) coatings plays a vital role in their sliding performance, but as long as their integrity is preserved under high temperature oxidizing conditions, the wear rates are found to be acceptable, as it occurs in the case of ball milled Fe-40Al (at.%) powder. The friction phenomenon and wear mechanisms were analyzed in detail through the wear track morphology, contact surface, and friction coefficients. The occurrence of brittle phases in the sprayed coatings, which are also present when tested at high temperatures, appeared to be crucial in accelerating the coating failure.

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Section: Introductionmentioning

confidence: 99%

Sliding Wear Behavior of Fe-Al Coatings at High Temperatures

et al. 2018

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“…However, recrystallization and grain-growth occur readily during high temperature annealing process. Nanocrystalline powders can also be produced using other methods like mechanical alloying [11,12]. Although a number of experimental and theoretical works have been done on different nanocrystalline materials, no work on compacted Fe-Ni invar nanocrystalline alloys could be found [13].…”

Section: Introductionmentioning

confidence: 99%

High Hardness Nanocrystalline Invar Alloys Prepared from Fe-Ni Nanoparticles

Choi

2018

Metals

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High-density (>98% of full density) nanocrystalline invar alloys with significantly enhanced hardness (>240 in Vicker's hardness) were prepared by sintering compacted Fe-Ni nanoparticles in hydrogen. The precursor Fe-Ni nanoparticles were synthesized by hydrogen plasma evaporation of bulk Fe 61 Ni 39 alloys. The size and the productivity of the Fe-Ni nanoparticles increased with increasing hydrogen pressure. The presence of surface oxidation of the Fe-Ni nanoparticles when exposed to air was proved by the X-ray photoelectron spectra measurements. The compacted Fe-Ni nanoparticles grew rapidly at 956 • C, while the oxide impurities were removed completely by following hydrogen at 735 • C, which was found to be optimum for the synthesis of oxide-free nanocrystalline metals with fine grain size. The typical hardness of an invar alloy prepared by melting method was around 140 HV. The significantly enhanced hardness of our nanocrystalline invar alloys was potentially important in strengthening the durability of its components in instruments and in improving its machinability when machining for a component.

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“…Then, the properties of the final product will depend on the morphology of the powder and particle size distribution, which in turn depend on the fabrication process. Some of these processes are mechanical alloying, [13][14][15][16] chemical synthesis, 17,18 laser-based processes, 19,20 combustion reaction 21 and flow-levitation method. 22 The mechanical alloying process is one of the most common fabrication process of FeAl powders, but the process is complex and presents problems, such as: pollution (coming from grinding elements), requires long time and energy consumption, oxidation risks, powder reactivity in the presence of air (consequently, they must be manipulated under an inert atmosphere), wide range of powder particle size distribution, agglomerated particles and hardening by deformation.…”

Section: Introductionmentioning

confidence: 99%

“…22 The mechanical alloying process is one of the most common fabrication process of FeAl powders, but the process is complex and presents problems, such as: pollution (coming from grinding elements), requires long time and energy consumption, oxidation risks, powder reactivity in the presence of air (consequently, they must be manipulated under an inert atmosphere), wide range of powder particle size distribution, agglomerated particles and hardening by deformation. [13][14][15][16] Some other processes commonly used for powder fabrication have low efficiency or low productivity, such as spray process or require further steps for powder generation, with the corresponding extra energy consumption, as the chemical reaction or electrodeposition processes. 23 Therefore, in the present work it is proposed to employ the production technique used previously for studying the environmental embrittlement characteristic of the AlFe intermetallic systems, 9,24,25 but directed and modified to develop a fabrication process as currently does not exist an industrial production process using this principle (disintegration of FeAl by the addition of water vapour).…”

Section: Introductionmentioning

confidence: 99%

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FeAl powder fabrication by rapid solidification and water vapour-based process

et al. 2016

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A fabrication process for FeAl intermetallic compound powders has been developed in the present work. The fabrication process is based on a technique employed to study the environmental embrittlement of AlFe intermetallic systems. In the present process, thin metallic ribbons were produced by rapid solidification, placed in a steel mesh inside a reactor for subsequent exposure to water vapour for their final transformation into metallic powders. The process also showed the possibility to add alloying elements in small quantities (1-4 at.-%) in order to improve FeAl ductility. The results showed that the present process has advantages in cost for industrial applications since the raw material low cost and the use of water vapour instead of employing high cost equipment. Additionally, the technique can fix some important problems in the process fabrication, which are generally presented in other powders processing techniques.

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Order-sintering of mechanically alloyed FeAl nanostructures

Cited by 11 publications

References 19 publications

Sliding Wear Behavior of Fe-Al Coatings at High Temperatures

Sliding Wear Behavior of Fe-Al Coatings at High Temperatures

High Hardness Nanocrystalline Invar Alloys Prepared from Fe-Ni Nanoparticles

FeAl powder fabrication by rapid solidification and water vapour-based process

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