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Free keywords:
Ductility; Fracture mechanics; High strength alloys; Hot working; Oxygen; Powder metallurgy; Titanium metallurgy; Zirconium metallurgy, Ductile to brittle transitions; Finer grains; High strength; Oxygen content; Solid solution strengthening; Structural similarity; Total elongations; Zr alloys, Zircaloy
Abstract:
Ti−Zr alloys (oxygen content 0.42−0.54 wt.) were prepared via powder metallurgy and hot working. The results indicate that the Ti−Zr alloys exhibit Zr-rich and Zr-lean areas with the same α-phase structure, and the Zr-rich area shows a slightly higher oxygen content and a much finer grain size. The Ti−Zr alloys present a good combination of high strength (σs=700−900 MPa) and total elongation (gt;20), and solid solution strengthening of oxygen plays a major role. Zr does not influence much the oxygen-induced brittleness due to its high structural similarity to Ti. Therefore, the high value of 0.54 wt. is still within the critical oxygen content for the ductile-to-brittle transition of Ti and does not degrade the ductility. © 2020 The Nonferrous Metals Society of China
