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Effects of pressure on the solidification of Al–Mn alloy

Published online by Cambridge University Press:  31 January 2011

Duanwei He ,
M. He ,
C. S. Kiminami ,
F. X. Zhang ,
Y. F. Xu ,
W. K. Wang  and
K. H. Kuo
Duanwei He
Affiliation:
Department of Materials Physics, University of Science and Technology Beijing, Beijing 100084, People's Republic of China, and Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
M. He
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
C. S. Kiminami
Affiliation:
Departmento de Engenhari de Materials, Universidade Federal Sao Carlos-sp-Brazil
F. X. Zhang
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Y. F. Xu
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
W. K. Wang
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
K. H. Kuo
Affiliation:
Department of Materials Physics, University of Science and Technology Beijing, Beijing 100084, People's Republic of China, and Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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Abstract

The solidification of Al–20 wt% Mn alloy was investigated under pressures up to 6 GPa. It was found that the solidification products under pressures below 4 Gpa were about the same, composed mainly of Al and Al6Mn. A new Al–Mn phase with needle like morphology and Al nanocrystallites in size less than 20 nm were obtained in the quenched alloy at 6 GPa. Structure analysis by transmission electron microscopy and x-ray diffraction indicated that the new phase had a C-center othorhombic unit cell with lattice constants of a = 0.7565(4) nm, b = 1.2965(6) nm, and c = 0.7801(6) nm. The composition was determined to be Al77.5Mn22.5 by election probe microanalysis. The phase evolution during solidification under different pressures was discussed. Our experimental results show that the pressure, as a basic thermodynamic variable like temperature, may play an important role on the solidification of the alloy.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 16 , Issue 4 , April 2001 , pp. 910 - 913
Copyright
Copyright © Materials Research Society 2001

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