METASTABLE PHASE IN RAPIDLY SOLIDIFIED Ni_3Al ALLOY

Acta Metall Sin

1992, Vol. 28

Issue (2): 25-29 DOI:

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METASTABLE PHASE IN RAPIDLY SOLIDIFIED Ni_3Al ALLOY

YANG Wenying;ZHANG Shouhua;LU Fanxiu University of Science and Technology Beijing

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YANG Wenying;ZHANG Shouhua;LU Fanxiu University of Science and Technology Beijing. METASTABLE PHASE IN RAPIDLY SOLIDIFIED Ni_3Al ALLOY. Acta Metall Sin, 1992, 28(2): 25-29.

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Abstract A laminar biphase structure may occur in rapidly solidified Ni_3Al and Ni_3Al(B)with over stoichiometrical Al content (25at.--%). Both electron and X--ray diffraction analyses showed that one is matrix phase γ' and other is a metastable phase. After calculation of lattice parameter by reduced cell method, the metastable phase is an orthorhombic structure of a=0.2355 nm, b=0.4157 nm and c=0.1683 nm. It was also proved experimentally that boron alloying does not influence the formation of laminar structure.

Key words: rapid solidification Ni_3Al metastable phase

Received: 18 February 1992

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1992/V28/I2/25

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