Premium
Interface considerations in high‐temperature titanium metal matrix composites
Author(s) -
VASSEL A.
Publication year - 1997
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1046/j.1365-2818.1997.d01-621.x
Subject(s) - materials science , composite material , composite number , titanium , brittleness , microstructure , cracking , creep , matrix (chemical analysis) , metal , metallurgy
Near‐α titanium alloys are of interest for continuous fibre reinforced titanium‐based composites owing to their better creep resistance than other titanium alloys. The main advantage of these matrices is that they can improve transverse properties of the composite at high temperature. However, cracking at the fibre/matrix interface in the as‐consolidated condition has been reported with some near‐α matrices. Two composites were compared in the present work: SCS‐6/Ti‐6‐2‐4‐2 and SCS‐6/IMI 834. Very few defects were detected in the SCS‐6/Ti‐6‐2‐4‐2 composite whereas an extensive cracking of interfibre spacings was observed in the SCS‐6/IMI 834 composite manufactured in the same conditions. Our investigations revealed that the fibre/matrix interaction zone is very similar in both composites, so this region cannot explain the brittle behaviour of the IMI 834 matrix. It has been established that cracking of the SCS‐6/IMI 834 composite results from a combined effect of thermal residual stresses and matrix microstructure.