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Elevated temperature properties of Mg–14Li–B particulate composites

Published online by Cambridge University Press:  31 January 2011

J. Wolfenstine ,
G. González-Doncel  and
O. D. Sherby
J. Wolfenstine
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
G. González-Doncel
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
O. D. Sherby
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305
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Abstract

The creep behavior of Mg–14Li particulate composites containing 0,10,20, and 30 vol. % boron particles was evaluated from 230 to 280°C. The results reveal that the creep strength of the particulate composite is increased by a factor of eight over the Mg–14Li matrix with the addition of 30 vol. % boron. The body-centered cubic (bcc) Mg–14Li alloy is shown, however, to be much weaker than hexagonal close-packed (hep) pure magnesium. This difference is attributed to the high rate of atom mobility in the open structure of the Mg–14Li bcc alloy. It is predicted that a Mg–6Li–30B particulate composite, containing an hep matrix structure, will have a higher specific strength at 250°C than the new experimental aluminum base–high iron alloys prepared by rapid solidification processing.

Type
Materials Communications
Information
Journal of Materials Research , Volume 5 , Issue 7 , July 1990 , pp. 1359 - 1362
Copyright
Copyright © Materials Research Society 1990

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