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Bulk Mg-Cu-Y-Al Alloys in the Amorphous, Supercooled Liquid and Crystalline States

Published online by Cambridge University Press:  17 March 2011

S. Linderoth ,
N. Pryds ,
M. Eldrup ,
A.S. Pedersen ,
M. Ohnuma ,
T.-J. Zhou ,
L. Gerward ,
J.Z. Jiang  and
C. Lathe
S. Linderoth
Affiliation:
Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
N. Pryds
Affiliation:
Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
M. Eldrup
Affiliation:
Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
A.S. Pedersen
Affiliation:
Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
M. Ohnuma
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
T.-J. Zhou
Affiliation:
Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark
L. Gerward
Affiliation:
Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark
J.Z. Jiang
Affiliation:
Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark
C. Lathe
Affiliation:
HASYLAB am DESY, D-22603 Hamburg, Germany
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Abstract

Bulk Mg-Cu-Y-Al alloys, prepared by casting into a wedge-shaped copper mold, have been studied in the as-prepared, the supercooled liquid, and the crystalline states. In the as-prepared state x-ray diffraction of sub-millimeter sized regions were performed using a focused x-ray beam. The phase composition of the cross section as well as of the surface of the wedge-shaped specimen was investigated as a function of position. The cooling history of the alloy was experimentally determined and compared to results of a control-volume finite-difference modelling study. The experimentally determined and the calculated cooling rates were correlated with the observed amorphous/crystalline structure. The transition from an amorphous to a crystalline state was followed by x-ray diffraction studies as a function of time at specific temperatures in the region between the glass transition and the crystallization temperature. Based on these results a temperature-time-phase diagram was constructed. The dependence of external pressure on the crystallisation temperature was investigated by in situ high-temperature and high- pressure x-ray powder diffraction by using synchrotron radiation. The investigations form the basis for a selection of the optimum temperature in the supercooled liquid region for performing deformation/shaping of the Mg-based alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 644: Symposium L – Supercooled Liquid, Bulk Glassy and Nanocrystalline State of Alloys , 2000 , L4.1
Copyright
Copyright © Materials Research Society 2001

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