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In-Situ Observation of Microcracking in a Tial-Cr-V Alloy Under Compressive Stress

Published online by Cambridge University Press:  22 February 2011

Z. J. Pu ,
Y. Q. Liu  and
K. H. Wu
Z. J. Pu
Affiliation:
Florida International University, Miami, FL 33199USA
Y. Q. Liu
Affiliation:
Florida International University, Miami, FL 33199USA
K. H. Wu
Affiliation:
Florida International University, Miami, FL 33199USA
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Abstract

The entire process of microcrack nucleation in a TiAl-Cr-V alloy with different microstructures is observed in situ by a scanning electronic microscope (SEM) during compressive deformation. The main results are summarized as follows: (1) In the fully lamellar microstructure, the microcracks nucleate mainly at the lamellar grain boundaries between soft-orientation and hard-orientation grains. (2) In the Widmanstatten structure, the microcracks distribute mainly at the intersection between two Widmanstatten plates. (3) In the duplex structure, the microcracks form at the lamella/ lamella and lamella/gamma boundaries. (4) In the nearly gamma structure, microcracks nucleate at gamma/gamma grain boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1041
Copyright
Copyright © Materials Research Society 1995

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