Quantitative phase analysis in Al86Ni8Y6 bulk glassy alloy synthesized by consolidating mechanically alloyed amorphous powder via spark plasma sintering

Maurya, Ram S.; Sahu, Ashok Kumar; Laha, Tapas

doi:10.1016/j.matdes.2015.12.129

Cited by 65 publications

(18 citation statements)

References 43 publications

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“…The Pseudo-Voigt function was used to fit the peaks of amorphous phases and crystalline phases, respectively, and the area of the peaks of amorphous phases and crystalline phases were calculated. The volume fraction of the amorphous phase was calculated using the following formula [21]:…”

Section: Phase and Microstructurementioning

confidence: 99%

Microstructure and Wear Resistance of Fe-Cr-Mo-Co-C-B Amorphous Composite Coatings Synthesized by Laser Cladding

Hou

Wang

et al. 2018

Metals

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A novel amorphous composite coating was synthesized successfully on 3Cr13 stainless steel by laser cladding Fe-Cr-Mo-Co-C-B amorphous alloy powder. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) were used to analyze the microstructure, composition, and phase structure of the coatings. Hardness and friction wear testers were used to analyze the hardness and wear resistance of the coatings. Results show that the cladding layer has an amorphous/crystalline composite structure, which is composed of a columnar grain region at the bottom and an amorphous region in the upper layer. The solute redistribution between the coating and the substrate in the bonding zone and the lower cooling rate at bottom account for the occurrence of crystallization. The highest hardness of the cladding layer is 1179 HV0.5, which is about 6 times that of the 3Cr13 stainless steel substrate (200 HV0.5). The cladding layer greatly improves the wear resistance of the substrate with a much lower coefficient of friction and wear mass loss compared with the substrate.

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Section: Phase and Microstructurementioning

confidence: 99%

Microstructure and Wear Resistance of Fe-Cr-Mo-Co-C-B Amorphous Composite Coatings Synthesized by Laser Cladding

Hou

Wang

et al. 2018

Metals

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“…These techniques take advantage of the Joule heat generated by the passage of an electric current through the powder mass. One of these techniques, Spark Plasma Sintering (SPS), has recently been applied to mechanically alloyed Al 86 Ni 8 Y 6 amorphous powders [8,9] reaching temperatures of up to 400 • C for a relatively long time in the order of minutes. However, other techniques such as Electrical Resistance Sintering (ERS) need a much shorter heating period.…”

Section: Introductionmentioning

confidence: 99%

Amorphous Al-Ti Powders Prepared by Mechanical Alloying and Consolidated by Electrical Resistance Sintering

Urban

Fernández

Caballero

et al. 2019

Metals

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A novel processing method for amorphous Al50Ti50 alloy, obtained by mechanical alloying and subsequently consolidated by electrical resistance sintering, has been investigated. The characterisation of the powders and the confirmation of the presence of amorphous phase have been carried out by laser diffraction, scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and transmission electron microscopy. The amorphous Al50Ti50 powders, milled for 75 h, have a high hardness and small plastic deformation capacity, not being possible to achieve green compacts for conventional sintering. Moreover, conventional sintering takes a long time, being not possible to avoid crystallisation. Amorphous powders have been consolidated by electrical resistance sintering. Electrically sintered compacts with different current intensities (7–8 kA) and processing times (0.8–1.6 s) show a porosity between 16.5 and 20%. The highest Vickers hardness of 662 HV is reached in the centre of an electrically sintered compact with 8 kA and 1.2 s from amorphous Al50Ti50 powder. The hardness results are compared with the values found in the literature.

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“…However, the powder technology route, viz. mechanical alloying, and consecutive spark plasma sintering have stimulated a considerable progress in enhancing the various properties of Al-based glassy alloys (Ref [8][9][10][11][12][13]. Mechanical alloying offers bulk amount of powder synthesis with a large composition range without much restriction of phase diagram (Ref 14).…”

Section: Introductionmentioning

confidence: 99%

The Glassy Structure Formation and Phase Evolution in Mechanically Alloyed and Spark Plasma-Sintered Al-TM-RE Alloys

Maurya

Laha

2019

J. of Materi Eng and Perform

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5 alloy powders via mechanical alloying performed at 300 revolution per minute with ball-to-powder ratio of 15:1 and subsequently the devitrification tendency of 300°C and 500°C spark plasma-sintered bulk amorphous alloys. Mechanically alloyed .5 powders yielded nearly fully amorphous structure after 140, 170 and 200 h, respectively. The requirement of prolonged milling was attributed to the soft and ductile nature of aluminum with high stacking fault energy. Amorphous powders were consolidated via spark plasma sintering at 300 and 500°C by applying a constant pressure of 500 MPa. X-ray diffraction was performed on the 300-and 500°Csintered samples. XRD patterns of the 300°C-sintered alloys exhibited very-low-intensity nanocrystalline FCC-Al peak overlaying an amorphous hump evincing retention of a large amount of the amorphous phase. Enhanced devitrification tendency was reported in the 500°C-sintered alloys; however, a major difference in the devitrification tendency of the 500°C-sintered Al 86 Ni 8 Y 6 , Al 86 Ni 6 Y 6 Co 2 and Al 86 Ni 6 Y 4.5 Co 2 La 1.5 alloys was that the quinary alloy exhibited higher tendency of devitrification, which was also corroborated by performing HRTEM and analytical TEM experiment. This could be attributed to the higher probability of coupling of atoms by short-range atomic shuffling during spark plasma sintering. Vickers hardness, and relative density estimated via ArchimedesÕ principle, varied depending on the degree of free volume annihilation and crystallization during sintering.

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Quantitative phase analysis in Al86Ni8Y6 bulk glassy alloy synthesized by consolidating mechanically alloyed amorphous powder via spark plasma sintering

Cited by 65 publications

References 43 publications

Microstructure and Wear Resistance of Fe-Cr-Mo-Co-C-B Amorphous Composite Coatings Synthesized by Laser Cladding

Microstructure and Wear Resistance of Fe-Cr-Mo-Co-C-B Amorphous Composite Coatings Synthesized by Laser Cladding

Amorphous Al-Ti Powders Prepared by Mechanical Alloying and Consolidated by Electrical Resistance Sintering

The Glassy Structure Formation and Phase Evolution in Mechanically Alloyed and Spark Plasma-Sintered Al-TM-RE Alloys

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