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High-Energy High-Rate Processing of High-Temperature Metal-Matrix Composites

Published online by Cambridge University Press:  22 February 2011

C. Persad ,
S. Raghunathan ,
B.-H. Lee ,
D. L. Bourell ,
Z. Eliezer  and
H. L. Marcus
C. Persad
Affiliation:
Center for Materials Science and Engineering The University of Texas at Austin, Austin, Texas 78712.
S. Raghunathan
Affiliation:
Center for Materials Science and Engineering The University of Texas at Austin, Austin, Texas 78712.
B.-H. Lee
Affiliation:
Center for Materials Science and Engineering The University of Texas at Austin, Austin, Texas 78712.
D. L. Bourell
Affiliation:
Center for Materials Science and Engineering The University of Texas at Austin, Austin, Texas 78712.
Z. Eliezer
Affiliation:
Center for Materials Science and Engineering The University of Texas at Austin, Austin, Texas 78712.
H. L. Marcus
Affiliation:
Center for Materials Science and Engineering The University of Texas at Austin, Austin, Texas 78712.
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Abstract

Advances in kinetic energy storage devices have opened up a new approach to powder processing of High Temperature Composites. The processing consists of internal heating of a customized powder blend by a fast electrical discharge of a homopolar generator. The high-energy high-rate “lMJ in 1s” pulse permits rapid heating of a conducting powder in a cold wall die. This short time at temperature approach offers the opportunity to control phase transformations and the degree of microstructural coarsening not readily possible using standard powder processing approaches. This paper will describe the consolidation results of two high temperature composite materials, (W-Ni-Fe)/B4C and (Ti3 Al+Nb)/SiC. The focus of this study was the identification of the reaction products formed at the matrix/reinforcement interface as a function of input energy and applied stress. Input energies beyond a threshold value for each system were required to produce detectable reaction products. In the (W-Ni-Fe)/B4C system, the reaction products formed at 4000 kJ/kg input energy under 420 MPa applied stress were a series of complex carbides and borides including W2C, FeWB, Fe3C, Fe6W6C and Ni4B3. The intermetallic Fe7W6 was also observed. In the (Ti3Al+Nb)/SiC system, the reaction products observed at 3400 kJ/kg and 210 MPa were TiC and TiSi2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 120: Symposium G – High-Temperature/High-Performance Composites , 1988 , 23
Copyright
Copyright © Materials Research Society 1988

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