Thermodynamics of Mg-Zn-RE system solutions forming stable quasicrystals

Journal Article · Tue Feb 15 04:00:00 EST 1994 · Scripta Metallurgica et Materialia; (United States)

OSTI ID:5508823

Zhiping, Luo; Shaoqing, Zhang ^[1]; Yali, Tang; Zhao, Dongshan ^[2]

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1. Inst. of Aeronautical Materials, Beijing (China)
2. Inst. of Tech., Zhengzhou (China)

Quasicrystal, with long-range orientational order different from crystal and amorphism, was first discovered in Al-Mn alloy prepared by rapid solidification. Later, stable quasicrystals were found in Al-Cu-Li, Al-Cu-Fe, Al-Cu-Mn, Al-Mn-Pd, Al-Pd-(Fe, Ru or Os), Ga-Mg-Zn and Mg-Zn-RE systems. For the dynamics consideration, quasicrystals may be formed if the cooling rates are high enough to prevent the diffusion of atoms from liquid, but lower than that for formation of amorphism. However, the fact that the quasicrystals are directly formed from liquid solutions with slow cooling rates, i.e. this kind of quasicrystal is an equilibrium phase, suggests that these solutions may have a special thermodynamical nature in addition to other physical factors. This paper deals with the thermodynamics of ternary Mg-Zn-RE solutions from which the stable quasicrystals formed. The thermodynamics of other solution systems are also reviewed for comparison.

• OSTI ID: 5508823
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 30:4; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
MAGNESIUM ALLOYS
RHENIUM ALLOYS
TERNARY ALLOY SYSTEMS
THERMODYNAMICS
ZINC ALLOYS