Phase decomposition and deformation of L1{sub 2}-ordered Co-rich Co{sub 3}Ti
Book
·
OSTI ID:72485
- Kyushu Univ., Fukuoka (Japan). Dept. of Materials Science and Engineering
The Co{sub 3}Ti phase hardens appreciably by the fine precipitation of disordered fee Co-rich phase upon aging after quenching from solution annealing temperature. Transmission electron microscope (TEM) observations revealed that the precipitates are platelet in shape, lying nearly parallel to the {l_brace}100{r_brace} planes of the L1{sub 2}-ordered matrix, and perfectly coherent with the matrix lattice at the beginning of aging. The high temperature strength increases appreciably with the fine precipitation of disordered Co-rich phase over the whole temperature range investigated. TEM observations of the underaged and deformed alloys revealed that superdislocations are pinned by precipitates indicating an attractive interaction between dislocations and precipitates. At the overaged state, thin twins are introduced in the fcc Co-rich precipitates during deformation.
- OSTI ID:
- 72485
- Report Number(s):
- CONF-941144--; ISBN 1-55899-265-0
- Country of Publication:
- United States
- Language:
- English
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