Two phases nanocrystalline Cu-Ag-La alloy induced by crystallization of amorphous phase

J. S. Park; A. Inoue; A. P. Tsai; T. Masumoto

Two phases nanocrystalline Cu-Ag-La alloy induced by crystallization of amorphous phase

J. S. Park, A. Inoue, A. P. Tsai, T. Masumoto

Center for Exploration of New Inorganic Materials

Research output: Contribution to journal › Article

Abstract

Crystallization has been studied in the amorphous Cu-Ag-La alloys by means of X-ray diffraction, differential scanning calorimeter and transmission electron microscopy. Amorphous Cu₅₂Ag₄₅La₃ alloy was found to crystallize two distinct stages; first and second stages are due to primary crystallization of nanocrystalline fcc-Cu and fcc-Ag phases and growth of primary crystalline. The crystallization process is the typical nucleation and growth transformation. The n-values of JMA plot are in the range of 2.5 and 3, indicating a diffusion controlled growth in the eutectiod cells. Mechanical properties; σ_f and H_v, are clearly improved by the partial crystallization of amorphous phase.

Original language	English
Pages (from-to)	179-183
Number of pages	5
Journal	Science Reports of the Rerearch Institutes Tohoku University Series A-Physics
Volume	42
Issue number	1
Publication status	Published - 1996 Mar

Keywords

Amorphous alloy
Copper-silver-lanthanum system
Insoluble type alloy
Partial crystallization
Two phases nanocrystalline

ASJC Scopus subject areas

Condensed Matter Physics
Metals and Alloys

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abstract = "Crystallization has been studied in the amorphous Cu-Ag-La alloys by means of X-ray diffraction, differential scanning calorimeter and transmission electron microscopy. Amorphous Cu52Ag45La3 alloy was found to crystallize two distinct stages; first and second stages are due to primary crystallization of nanocrystalline fcc-Cu and fcc-Ag phases and growth of primary crystalline. The crystallization process is the typical nucleation and growth transformation. The n-values of JMA plot are in the range of 2.5 and 3, indicating a diffusion controlled growth in the eutectiod cells. Mechanical properties; σf and Hv, are clearly improved by the partial crystallization of amorphous phase.",

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AU - Park, J. S.

AU - Inoue, A.

AU - Tsai, A. P.

AU - Masumoto, T.

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N2 - Crystallization has been studied in the amorphous Cu-Ag-La alloys by means of X-ray diffraction, differential scanning calorimeter and transmission electron microscopy. Amorphous Cu52Ag45La3 alloy was found to crystallize two distinct stages; first and second stages are due to primary crystallization of nanocrystalline fcc-Cu and fcc-Ag phases and growth of primary crystalline. The crystallization process is the typical nucleation and growth transformation. The n-values of JMA plot are in the range of 2.5 and 3, indicating a diffusion controlled growth in the eutectiod cells. Mechanical properties; σf and Hv, are clearly improved by the partial crystallization of amorphous phase.

AB - Crystallization has been studied in the amorphous Cu-Ag-La alloys by means of X-ray diffraction, differential scanning calorimeter and transmission electron microscopy. Amorphous Cu52Ag45La3 alloy was found to crystallize two distinct stages; first and second stages are due to primary crystallization of nanocrystalline fcc-Cu and fcc-Ag phases and growth of primary crystalline. The crystallization process is the typical nucleation and growth transformation. The n-values of JMA plot are in the range of 2.5 and 3, indicating a diffusion controlled growth in the eutectiod cells. Mechanical properties; σf and Hv, are clearly improved by the partial crystallization of amorphous phase.

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