Al-Cu-Co-Ge SINGLE DECAGONAL QUASICRYSTALS GROWTH BY DIRECTIONAL SOLIDIFICATION

Acta Metall Sin

1995, Vol. 31

Issue (1): 1-6 DOI:

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Al-Cu-Co-Ge SINGLE DECAGONAL QUASICRYSTALS GROWTH BY DIRECTIONAL SOLIDIFICATION

CHEN Lifan;CHEN Xichen;(Institute of physics;Chinese A cademy of Sciences;Beijing 100080)(Manuscript received 94-07-05)

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CHEN Lifan;CHEN Xichen;(Institute of physics;Chinese A cademy of Sciences;Beijing 100080)(Manuscript received 94-07-05). Al-Cu-Co-Ge SINGLE DECAGONAL QUASICRYSTALS GROWTH BY DIRECTIONAL SOLIDIFICATION. Acta Metall Sin, 1995, 31(1): 1-6.

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Abstract The large single decagonal quasicrystals of 0.8 mm in diameter and 10 mm in length in Al-Cu-Co-Ge alloy have been obtained by controlled unidirectional solidification.In the process of growth, all of the single quasicrystals grew preferentially along uni-orientation of solidification.The centre axis of quasicrystalline prisms is the tenfold rotational symmetry axis. Under the condition of temperature gradient about 95℃/ cm,the segregation will be occurred and the growing interface will be changed from planar structure into cellular and/ or dendritic one with increasing directional solidification rate.and a large number of crystalline phases will be produced. Thus,it seems to be no means of growing required single quasicrystals of high quality.Correspondent:CHEN Lifan, Institute of physics,Chinese Academy of Science, Beijing 100080

Key words: single decagonal quasicrystal directional solidification Al-Cu-Co-Ge alloy

Received: 18 January 1995

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