Kinetics of the amorphous to icosahedral structure transition in Al-Cu-V and Al-Mn-Si alloys

Journal Article · Mon May 01 00:00:00 EDT 1989 · Acta Metallurgica; (USA)

DOI:https://doi.org/10.1016/0001-6160(89)90176-4· OSTI ID:5735071

Tsai, A P; Inoue, A; Bizen, Y; Masumoto, T ^[1]

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1. Tohoku Univ., Sendai (Japan). Inst. for Materials Research

Transformation kinetics of rapidly quenched Al/sub 75/Cu/sub 15/V/sub 10/ and Al/sub 55/Mn/sub 20/Si/sub 25/ amorphous alloys to icosahedral phases were examined by differential scanning calorimetry and transmission electron microscopy. The transformation is analogous to the polymorphous transformation by homogenous nucleation and diffusionless growth. The Avrami exponent and activation energy for transformation were measured to be 1.7-2.0 and 2.5 eV, respectively, for both alloys. The activation energy for growth during the transformation was estimated to be about 2.6 eV for Al/sub 75/Cu/sub 15/V/sub 10/ and 2.7 eV for Al/sub 55/Mn/sub 20/Si/sub 25/. The difference in free energy between the amorphous and crystalline phases was estimated to be 1.6 times larger than that between the amorphous and quasicrystalline phases.

• OSTI ID: 5735071
• Journal Information: Acta Metallurgica; (USA), Journal Name: Acta Metallurgica; (USA) Vol. 37:5; ISSN 0001-6160; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
ALLOYS
ALUMINIUM ALLOYS
AMORPHOUS STATE
CHEMICAL REACTION KINETICS
COPPER ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
ENERGY
KINETICS
MANGANESE ALLOYS
MICROSCOPY
MICROSTRUCTURE
NUCLEATION
QUASI PARTICLES
QUENCHING
REACTION KINETICS
SILICON ALLOYS
TRANSFORMATIONS
TRANSMISSION ELECTRON MICROSCOPY
VANADIUM ALLOYS