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Fracture During High Temperature Deformation of A Ti-44A1-3V-7.5v/o TiB2 XD™ Composite

Published online by Cambridge University Press:  01 January 1992

D. Zhao ,
J. J. Valencia ,
K. G. Anand  and
S. J. Wolff
D. Zhao
Affiliation:
Concurrent Technologies Corporation, 1450 Scalp Avenue, Johnstown, PA 15904, U.S.A.
J. J. Valencia
Affiliation:
Concurrent Technologies Corporation, 1450 Scalp Avenue, Johnstown, PA 15904, U.S.A.
K. G. Anand
Affiliation:
Concurrent Technologies Corporation, 1450 Scalp Avenue, Johnstown, PA 15904, U.S.A.
S. J. Wolff
Affiliation:
Concurrent Technologies Corporation, 1450 Scalp Avenue, Johnstown, PA 15904, U.S.A.
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Abstract

High temperature compression workability tests have been performed on a Ti-44a/oA1-3a/oV- 7.5v/oTiB2 XD™ composite over a range of temperatures (1273 to 1473 K), strain rates (10−3 to 10 s−1), and interrupted strains. Three types of specimen configurations were used in the tests. Fracture caused by secondary tensile stress at the surface of the specimens was investigated in terms of crack initiation and propagation. The fractured specimens were analyzed using both optical and SEM microscopy. Cracks started at the equator of the specimens and propagated into the specimens through their longitudinal axis. The fracture mode varied with temperature and strain rate. At the lowest temperature (1273 K) and the lower strain rate (0.1 s−1), the fracture was transgranular with a crack arrester type. At the lowest and intermediate temperatures (1273 and 1373 K) and the highest strain rate (10 s−1), intergranular cracks were observed. At the highest temperature (1473 K) and the highest strain rate (10 s−1), transgranular failures with delamination and crack divider types were observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 1069
Copyright
Copyright © Materials Research Society 1995

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References

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