Abstract
The morphologies, crystallographic characteristics and phase transitions of Ti precipitates developed in arc-melted and heat-treated Nb–Ti–Si based ultrahigh temperature alloys have been investigated by high resolution transmission electron microscopy (HRTEM). Rod-like Ti precipitates with fcc structure could only be found at interfaces in the arc-melted specimens, while ultrafine fcc-Ti precipitates formed inside Nbss in the heat-treated specimens. The fcc-Ti precipitates at interfaces partially transformed into hcp-Ti lamellas through a martensitic transformation during heat-treatment, and twins composed of different directional hcp-Ti lamellas formed in the fcc-Ti matrix with the orientation relationship (OR): [110]fcc−Ti//[112¯0]M//[1¯1¯20]T. The precipitation mechanisms of fcc-Ti grains in Nbss and hcp-Ti lamellas in fcc-Ti matrix have been analyzed.
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