Structure and Properties of Consolidated Attrition-Milled Al-5%Ti PM Specimens

Cuevas, F. G.; Cintas, J.; Rodríguez, João Alcino; Gallardo, José M.

doi:10.4028/www.scientific.net/msf.426-432.4307

Cited by 3 publications

(3 citation statements)

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“…In general, a higher content of Ti produces a greater final hardness, because of forming an Al(Ti) solid solution after mechanical alloying and/or intermetallic compounds like Al 3 Ti, AlTi and AlTi 3 after heat treating or sintering. For instance, with the presence of only 2.88 at.% of titanium, sintered aluminium compacts increase the hardness from 80 HV to about 104 HV [22]. With the increase of titanium up to 5.58 at.%, the hardness increases to about 202 HV [15].…”

Section: Hardness Of Al-ti Alloysmentioning

confidence: 99%

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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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Section: Hardness Of Al-ti Alloysmentioning

confidence: 99%

“…Hardness of aluminium, titanium and Al 50 Ti 50 alloys according to bibliographic data[15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

mentioning

confidence: 99%

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

Urban

Fernández

Caballero

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

“…Traditionally, in the powder metallurgy field, aluminium has been reinforced with a variety of directly added particles, such as alumina, silicon carbide, titanium carbide and others [1][2][3][4]. On the other hand, it has been found that the reinforcement of aluminium powder is more effective when these dispersoids are formed through direct reaction of the aluminium with its environment, rather than by simply mixing aluminium with ceramic composites [5][6][7][8][9][10]. Several authors have shown that the milling atmosphere employed, during a mechanical alloying (MA) process, influences the final properties of the obtained powders [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Order Effect of Vacuum and Ammonia Atmospheres on Aluminium Nitriding by Mechanical Alloying

Caballero

Cintas

Herrera-García³

et al. 2012

MSF

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Aluminium powder was milled under vacuum and/or ammonia atmospheres, in order to evaluate the effect of the order of the atmospheres on the amount of nitrides appearing in the powder after a subsequent heat treatment. All milling experiences were carried out at room temperature for 5 h. The XRD study of sintered powders showed that important amounts of AlN appeared after heating. The use of vacuum and ammonia flow allows controlling the percentage of N rich phases formed. Moreover, the capacity of incorporating nitrogen to the aluminium lattice is very influenced by the vacuum and ammonia flow atmospheres order during the milling process.

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