Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2014-05-03

Journal: PHILOSOPHICAL MAGAZINE

Included Journals: Scopus、EI、SCIE

Volume: 94

Issue: 13

Page Number: 1463-1477

ISSN: 1478-6435

Key Words: cluster-plus-glue-atom model; quasicrystals; hardness

Abstract: In this paper, the hardness of ternary Al-based quasicrystals was assessed through an application of the cluster-plus-glue-atom model. In this model, any structure is decomposed into a first-neighbour strongly bonded cluster part and second-neighbour weakly bonded glue-atom part so that the overall structural information is condensed into a local structural unit [cluster](glue atom)(x). For quasicrystals, the averaged local units are formulated as [icosahedron] TM0,1(Transition Metal) and could be visualized as single icosahedron packing. Then, the hardness of quasicrystals was related to the rupture of weak inter-cluster bonds. Typically, theoretical hardness values of 8-9 GPa were obtained using 19 broken inter-cluster bonds, which accounts for about half of all the surface bonds of an icosahedron in the Mackay-type environment. The unit cluster formulas would act as rigid units during deformation and cracking.