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Phase and lattice parameter relationships in rapidly solidified and heat-treated (Mn0.53Al0.47)100−xCx pseudo-binary alloys

Published online by Cambridge University Press:  31 January 2011

C.T. Lee ,
K.H. Han ,
I.H. Kook  and
W.K. Choo
C.T. Lee
Affiliation:
Nuclear Materials Development Department, Korea Atomic Energy Research Institute, P.O. Box 7, Daeduk-Danji, Taejon 305-353, Korea
K.H. Han*
Affiliation:
Department of Metallurgical Engineering, Yeungnam University, Kyongsan, Kyongbuk 712-749, Korea
I.H. Kook
Affiliation:
Nuclear Materials Development Department, Korea Atomic Energy Research Institute, P.O. Box 7, Daeduk-Danji, Taejon 305-353, Korea
W.K. Choo
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Cheongryang P.O. Box 150, Seoul 130-650, Korea
*
a)Address correspondence to this author.
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Abstract

The phase constitution and the lattice parameter relationships in the rapidly solidified and heat-treated (Mn0.53Al0.47)100−xCx pseudo-binary alloys (x = 0–6) have been investigated by means of x-ray diffraction and transmission electron microscopy. The melt-spun alloys contained a single ∊ phase (cph) with 0.63–4.0 at. % C, and below and beyond this carbon composition range small traces of γ2-MnAl and Al4C3 compounds were formed, respectively. The heat treatment of the melt-spun alloys at 823 K produced a single τ phase (ordered bct, CuAu type I, L10) with 0.63–3.6 at.% C. The c lattice parameter of the ∊ unit cell was observed to increase pronouncedly with the carbon content whereas that of the a-axis revealed no apparent change; the corresponding increase of the unit cell volume was taken to indicate an interstitial dissolution of the carbon atoms in the ∊ lattice. On the other hand, for the τ phase, the c lattice parameter increased markedly with the carbon content while the a parameter decreased slightly, so that a large increase of c/a ratio was produced. The lattice parameter data for the τ phase thus indicated an increase of the unit cell volume with the carbon content, providing new evidence that the carbon atoms dissolve interstitially in the bct lattice. In addition, it was deduced that the higher c/a ratio with increasing carbon content may arise from a preferential site occupation of the carbon atoms at a specific type of octahedral interstitial site lying in the manganese atom layers.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 7 , July 1992 , pp. 1690 - 1695
Copyright
Copyright © Materials Research Society 1992

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