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Phase formation in mechanically alloyed Nb-Al powders (1988)

Hellstern, E. ; Schultz, L. ; Bormann, R. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 53 (1988), S. 1399-1401

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Nb-Al alloys have been prepared by mechanical alloying of elemental crystalline powders and investigated with x-ray diffraction and transmission electron microscopy. Crystalline equilibrium phases form for Al-rich alloys. Amorphous phase formation is observed for the Nb50Al50 composition. Mechanically alloyed powders with more than 70 at. % Nb exhibit the metastable bcc (A2) solid solution which transforms after thermal annealing into the A15 phase. Formation of the different phases can be understood by considering the free-energy curves of the amorphous and bcc phases as calculated from the phase diagram and additional thermodynamic data.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.99989

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