Icosahedron and icosahedral order in rapidly solidified A1-Ni-Mo alloys

Journal Article · Tue Sep 01 00:00:00 EDT 1992 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(92)90337-E· OSTI ID:6907260

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

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

The quasicrystalline state characterized by long range icosahedral order was firstly reported by Shechtman et al. Icosahedral bond-orientational order has ben observed in a molecular dynamics simulation of an under-cooled Lennard-Jones liquid. A correlation between the structure factors of metallic glasses and the icosahedral solid was also noted. Al[sub 12]Mo(or Al[sub 12]W) is a compound with a structure consisting of a bcc array of Al icosahedron centered by Mo(or W); thus it contains 13 atoms per primitive unit cell and local icosahedral packing which is in favor of the formation of an icosahedral phase in a quenched state. Meanwhile Ni is known as a promotion element for the creation of an Al based amorphous alloy. The authors have observed that the icosahedral phase is created in AlNiMo alloys and transited to an amorphous phase with increasing Ni. Transformation from amorphous via i-phase and finally to Al[sub 12]Mo was observed in Al[sub 85Ni][sub 10Mo][sub 5]. In this paper, the authors focus on the icosahedron and icosahedral order in correlation with composition in the Al-Ni-Mo system.

• OSTI ID: 6907260
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 27:5; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
PHASE STUDIES
NICKEL ALLOYS
AMORPHOUS STATE
BCC LATTICES
CHEMICAL COMPOSITION
MOLYBDENUM ALLOYS
SOLIDIFICATION
SYMMETRY
TIME DEPENDENCE
ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
PHASE TRANSFORMATIONS
360102* - Metals & Alloys- Structure & Phase Studies