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In Situ Straining Tem Observation of Fracture behavior in Pst Crystals of TiAl

Published online by Cambridge University Press:  22 February 2011

Mingwei Chen ,
Da Chen  and
Dongliang Lin
Mingwei Chen
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Da Chen
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Dongliang Lin
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
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Abstract

Crack propagation process in TiAl alloy PST crystal has been investigated by in situ straining TEM observation. It has been found that the influence of lamellar boundaries on the fracture behaviors is connected with the types of interfaces (twin, pseudo-twin and α2/γ interfaces). Even though secondary microcracks always nucleate at α2/γ interfaces due to stress concentration, the crack growth is cleavage in α2 and γ phases rather than along interlamellae. When a crack meet γ/γ interfaces, its propagation can be inhibited and crack tips blunt by the slide of the interfaces. It also deserves to be mentioned that ductility of PST crystals has connection with the rate of crack propagation..

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1047
Copyright
Copyright © Materials Research Society 1995

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