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Phase transformation and thermal expansion of Cu/ZrW2O8 metal matrix composites

Published online by Cambridge University Press:  31 January 2011

Hermann Holzer  and
David C. Dunand
Hermann Holzer
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
David C. Dunand
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Abstract

Powder metallurgy was used to fabricate fully dense, unreacted composites consisting of a copper matrix containing 50–60 vol% ZrW2O8 particles with negative thermal expansion. Upon cycling between 25 and 300 °C, the composites showed coefficients of thermal expansion varying rapidly with temperature and significantly larger than predicted from theory. The anomalously large expansion on heating and contraction on cooling are attributed to the volume change associated with the allotropic transformation of ZrW2O8 between its high-pressure γ-phase and its low-pressure α- or β-phases. Based on calorimetry and diffraction experiments and on simple stress estimations, this allotropic transformation is shown to result from the hydrostatic thermal stresses in the particles due to the thermal expansion mismatch between matrix and reinforcement.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 3 , March 1999 , pp. 780 - 789
Copyright
Copyright © Materials Research Society 1999

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