Author： Nakamura Morihiko Kaieda Yoshinari
Publisher： Maney Publishing
ISSN： 1743-2901
Source： Powder Metallurgy, Vol.31, Iss.3, 1988-01, pp. : 201-209
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Abstract
Pulverised TiAl powder was cold isostatically pressed at 392 MPa and the resulting compact sintered at temperatures up to 1623 K to produce sintered TiAl with relative densities as high as 91%. This process formed a laminated structure consisting of TiAl and Ti3AI, which gave a high compressive yield strength accompanied by embrittlement of the sintered TiAl compacts, no bending plastic deformation being observed at room temperature. When centrifugally atomised powder melted in a CaO crucible was used, sintered TiAl specimens, apparently of full theoretical density, could be obtained by canned hipping at 1473 K under a pressure of 98 MPa. The hipped TiAl specimens had a grain size of ~20–30 μm, and grain coarsening was not observed, even when specimens were annealed for 720 ks at temperatures of 1273–1373 K. Hipped specimens annealed at 1273 K had a yield strength of 388 MN m −2 at room temperature, and bending ductilities > 0·4% were obtained. PM/0426
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