Metastable phase formation in rapidly solidified Al–Mo alloys

Logan, E.A.; Pratt, J.N.; Loretto, M. H.

doi:10.1179/mst.1989.5.2.123

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…This level of supersaturation matches that reported in mechanically alloyed materials 10 and is at least twice that observed in rapidly quenched alloys reported to date. 5,7 An estimate of the supersaturation limit has been made by Logan et al, 7 who calculated the free energies of the Al-Mo fcc solid solution and the liquid as a function of composition and temperature. The maximum supersaturation was then estimated from the intersection of the free energy-composition curves, which represented the point where the compositionally invariant transformation of the liquid to the solid solution might become thermodynamically possible, assuming no other phases were nucleated.…”

Section: Sem/eds Characterization Of the Al-mo Alloy Deposits-figurementioning

confidence: 99%

“…This treatment yielded a maximum solubility of 6.5 atom % Mo at 10 K and 4.5 atom % Mo at room temperature. 7 In addition to the level of supersaturation obtained in the fcc phase, it is interesting to note that the supersaturation is maintained when the amorphous phase is codeposited. Similar behavior was also noted for Al-Zr alloys electrodeposited at ambient temperature from AlCl 3 -EtMeImCl.…”

Section: Sem/eds Characterization Of the Al-mo Alloy Deposits-figurementioning

confidence: 99%

“…1,[16][17][18][19][20][21] These metastable solid solutions are being considered as precursors for precipitation hardenable alloys. Polyesya and Stepina 5 and Logan et al 7 have reported supersaturations of 2.7 and 2.45 atom % Mo, respectively, in rapidly solidified alloys. In the latter case, two metastable crystalline phases were observed along with the solid solution.…”

mentioning

confidence: 93%

“…2 At room temperature, Mo has negligible solubility in Al. 3 As a consequence, extended solid solutions must be prepared by nonequilibrium alloying methods such as rapid solidification, [4][5][6][7] laser-surface melting, 8 mechanical alloying, 9,10 ion implantation, [11][12][13][14][15] and radio frequency ͑rf͒-magnetron sputtering. 1,[16][17][18][19][20][21] These metastable solid solutions are being considered as precursors for precipitation hardenable alloys.…”

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confidence: 99%

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Electrodeposition of Al-Mo Alloys from the Lewis Acidic Aluminum Chloride-1-ethyl-3-methylimidazolium Chloride Molten Salt

Tsuda

Hussey

Stafford

2004

J. Electrochem. Soc.

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The electrodeposition of aluminum-molybdenum alloys was examined at copper rotating disk and wire substrates in the Lewis acidic 66.7-33.3 mol % aluminum chloride-1-ethyl-3-methylimidazolium chloride molten salt containing Mo͑II͒ in the form of dissolved (Mo 6 Cl 8 )Cl 4 . The molybdenum content of the electrodeposits depended on the electrode rotation rate, Mo͑II͒ concentration, and bath temperature. It was possible to produce nonequilibrium alloys containing up to 11 atom % Mo. These alloy deposits were compact and chloride-free. Al-Mo alloys containing more than 8 atom % Mo exhibited a chloride corrosion pitting potential of approximately ϩ800 mV against pure aluminum. The corrosion resistance of this alloy is superior to that of all the aluminum-transition metal alloys that have been electrodeposited to date from chloroaluminate molten salts.

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Section: Sem/eds Characterization Of the Al-mo Alloy Deposits-figurementioning

confidence: 99%

Section: Sem/eds Characterization Of the Al-mo Alloy Deposits-figurementioning

confidence: 99%

mentioning

confidence: 93%

mentioning

confidence: 99%

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Electrodeposition of Al-Mo Alloys from the Lewis Acidic Aluminum Chloride-1-ethyl-3-methylimidazolium Chloride Molten Salt

Tsuda

Hussey

Stafford

2004

J. Electrochem. Soc.

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The Al-Mo system (aluminum-molybdenum)

Saunders

1997

JPE

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The AI-Mo system is of a complex type, and a variety of phases are reported as being stable [Hansen, Elliott, Schunk].[80Bre] reviewed the literature and gave a phase diagram. The diagram presented here (Fig. 1, Table 1) differs in a number of aspects from [80Bre] and is based on a review of original data and thermodynamic calculations. AI-Rich Alloys (0 to 33 at.% Mo) The composition of the Al-rich liquidus is well established up to 1000 ~ [40Yam, 76Yer, 80Mal] (Fig. 2, Table 2). Based on this and the solid solubility measurements of Mo in A1 reported by [43Mon] and [60Vig] (Table 2), the most Al-rich reaction is a peritectic between the AI solid solution and All2Mo. This differs from [80Bre], who assumed a eutectic reaction.There is uncertainty concerning the stability of, and the exact sequence of, reactions involving the Al-rich intermetallic compounds.[64Wall] reviewed the available data previous to 1964 and put forward the reaction sequence shown in Fig. 3, where four peritectic reactions are postulated at 1130, 800, 735, and 700 ~ This review formed the basis for the reaction sequence given by [80Bre]. There is experimental evidence for reactions at ~ 1130 ~ [22Rei, 59Spe], -735 ~ [22Rei, 52Wac, 59Spe], and -700 ~ [40Yarn, 59Spe, 60Cla]. The peritectic reactions reported by [72Kam] at 717 and 684 ~ correspond to those at 735 and 700 ~ but lie -17 ~ lower.A review of the literature shows that the peritectic at 700 ~ is associated with the formation of All2MO [59Spe, 60Cla, 72Kam] and the peritectic at 735 ~ with

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Improvement of mechanical properties in micro-alloying Al-Si-Mg-Zn cast alloy

Wang

Zhang

et al. 2021

Materials Letters

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Metastable phase formation in rapidly solidified Al–Mo alloys

Cited by 7 publications

References 7 publications

Electrodeposition of Al-Mo Alloys from the Lewis Acidic Aluminum Chloride-1-ethyl-3-methylimidazolium Chloride Molten Salt

Electrodeposition of Al-Mo Alloys from the Lewis Acidic Aluminum Chloride-1-ethyl-3-methylimidazolium Chloride Molten Salt

The Al-Mo system (aluminum-molybdenum)

Improvement of mechanical properties in micro-alloying Al-Si-Mg-Zn cast alloy

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