Abstract
Abstract High temperature compression properties and microstructure of two Ti–Al based alloys with and without Sc were studied The results show that minor addition may remarkably improve the high temperature yield strength of Ti–Al and Ti–48Al based alloy which have either duplex structure or full lamellar structure, the yield strength increment is 120 and 125 MPa, respectively. Minor Sc exists as Ti 3 (Al,Sc) in plate precipitates which distribute mainly along with α 2 /γ or γ/γ T boundaries, partly within γ phases. At high temperature, deformation of γ phases is easier than that in the α 2 phase, the deformation mode is dislocation slipping. The obstacle to interlamellar sliding and dislocation slipping caused by Ti 3 (Al, Sc) precipitates should be responsible for yield strength increment of Ti–Al alloys with Sc.
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