Interface studies in a Ti-6Al-4V/sigma fiber composite

D. UPADHYAYA; M.A. BAKER; C.M. WARD-CLOSE; P. TSAKIROPOULOS; F.H. FROES

doi:doi:10.1051/jp4:19937269

Numéro		J. Phys. IV France Volume 03, Numéro C7, Novembre 1993 The 3rd European Conference on Advanced Materials and Processes Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés


Page(s)		C7-1717 - C7-1722
DOI		https://doi.org/10.1051/jp4:19937269

The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-1717-C7-1722
DOI: 10.1051/jp4:19937269

Interface studies in a Ti-6Al-4V/sigma fiber composite

D. UPADHYAYA¹, M.A. BAKER², C.M. WARD-CLOSE³, P. TSAKIROPOULOS² and F.H. FROES¹

¹ Institute for Materials and Advanced Processes, University of Idaho, Moscow, ID 83843, U.S.A.
² Department of Materials Science and Engineering, University of Surrey, Guildford, Surrey GU2 5XH, U.K.
³ Materials and Structures Dept. DRA Farnborough, Hants GU14 6TD, U.K.

Abstract
The paper reports results from an on going study of the interfaces in diffusion bonded Ti-GAl-4V/Sigma composites. This paper concentrates on the analysis of a composite in the as-received condition using Auger electron spectroscopy (AES) and scanning electron microscopy (SEM). The SiC based Sigma fiber has a tungsten core and a duplex coating of carbon (adjacent to the SiC deposit) and TiB_x. It is shown that boron from the TiB_x layer diffused into the matrix and formed TiB needles. Carbon was detected in the TiB_x layer. Analysis of in-situ fracture surfaces has shown that the failure was initiated either within the carbon layers or at the TiB_x-matrix interface. The oxygen detected at the TiB_x-matrix interface influenced the fracture behavior of the composite.