Yukiharu Suzuki, Tetsuya Suzuki and Tokuzou Tsujimoto
Department of Materials Science, Faculty of Engineering, Ibaraki University, Hitachi 316
Mechanical properties of a Ti-46 mol%Al alloy with full lamellae refined using a discontinuous coarsening reaction have been examined by a compression test in a range of RT{~}1273 K and a tensile test at both RT and 1073 K. Also, the effects of lamellar grain size, lamellar grain boundary and lamellar morphology on the deformation behavior have been investigated.
The compression properties at RT were improved by refinement of the lamellar grain. Up to 1073 K, the strength was not decreased because the area of the serrated grain boundary which was considered to improve the high-temperature strength was increased by the refinement. The deformation mechanism of coarsely-spaced lamellae was similar to that of finely-spaced lamellae.
(Received April 1, 1997)
intermetallic compound, Ti3Al, compression test, tensile test, interface facet, translamellar fracture
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