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Properties of Microlaminated Intermetallic-Refractory Metal Composites

Published online by Cambridge University Press:  25 February 2011

R. G. Rowe ,
D. W. Skelly ,
M. Larsen ,
J. Heathcote ,
G. Lucas  and
G. R. Odette
R. G. Rowe
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12309
D. W. Skelly
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12309
M. Larsen
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12309
J. Heathcote
Affiliation:
University of California at Santa Barbara, Materials Department, Santa Barbara, CA
G. Lucas
Affiliation:
University of California at Santa Barbara, Materials Department, Santa Barbara, CA
G. R. Odette
Affiliation:
University of California at Santa Barbara, Materials Department, Santa Barbara, CA
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Abstract

Microlaminated composites of Nb3Al-Nb and Cr2Nb-Nb(Cr) were synthesized by high rate magnetron sputtering. Both composites were stable at elevated temperatures. A Cr2Nb-Nb(Cr) composite with 2 µm metal and intermetallic layers had room temperature tensile fracture strength over 725 MPa and a fracture toughness of about 20 MPa√m. Composites with 2 µm and 6 µm thick refractory metal and intermetallic laminations were compared and it was found that layer thickness did not affect fracture toughness. Microlaminates with the thicker 6 µm laminations had lower fracture strength, however. Good fracture strength and high fracture toughness indicated that microlaminated high temperature composites synthesized by vapor phase deposition exhibit the properties predicted by ductile toughening models.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 461
Copyright
Copyright © Materials Research Society 1994

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