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Microstructure and interfaces in TiB2/Ti-46Al-3Cr Alloy Composites

Published online by Cambridge University Press:  10 February 2011

Weimin Si ,
Michael Dudley ,
Pengxing Li  and
Renjie Wu
Weimin Si
Affiliation:
Department of Mater. Sci. and Engr., SUNY at Stony Brook, Stony Brook, NY 11794-2275
Michael Dudley
Affiliation:
Department of Mater. Sci. and Engr., SUNY at Stony Brook, Stony Brook, NY 11794-2275
Pengxing Li
Affiliation:
Department of Mater. Sci., Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Renjie Wu
Affiliation:
Department of Mater. Sci., Shanghai Jiao Tong University, Shanghai 200030, P. R. China
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Abstract

A ternary titanium aluminide alloy, Ti-46Al-3Cr (at%), was discontinuously reinforced with 5 vol% titanium diboride (TiB2), by an in-situ synthesis technique, resulting in a two phase γ(TiAl) (mainly) and α2(Ti3Al) matrix with randomly dispersed TiB2 particle. Interfaces of TiB2-TiAl were investigated by Analytical Electron Microscopy (AEM) and High Resolution Electron Microscopy (HREM). No consistent crystallographic orientation relationship was observed between TiB2 particle and TiAl matrix, and there was no evidence of alloying elements (such as Cr) segregation or interphase formation at the TiB2-TiAl interface. HREM results indicated that no semi-coherent interface between TiB2 and TiAl has been observed. There existed a thin amorphous layer (0.5 to 1.3 nm) at the TiB2-TiAl interface, which may accommodate the large lattice misfit across the interface and enhance the interfacial bonding.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 410: Symposium S – Covalent Ceramics III-Science and Technology of Non-Oxides , 1995 , 405
Copyright
Copyright © Materials Research Society 1996

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References

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