Abstract
A new near β titanium alloy Ti-7333 with ultrahigh tensile strength and reasonable ductility after subtransus solution followed by aging treatment has been developed in China. The fracture toughness tests were carried out on the material at room temperature in order to understand the fracture mechanism. The results show that Ti-7333 alloy has a high fracture toughness value (>120 MPa) under the BASCA heat treatment processing (β solution, slow cooling and aging). Meanwhile the elongation and reduction of area remain about 19% and 45% respectively, and its corresponding tensile strength maintains about 1000 MPa. The fracture toughness value increases with increasing of the α lamellar cluster structure and growth of the grain boundary α phase. The tighter and more multidirectional arrangement of colony of α lamellae caused the change of the crack propagation path. And the thickness of α lamellae microstructure can effect the characteristic of plastic zone of crack tip obviously. It is this microstructure improves the fracture toughness of Ti-7333 alloy with the superior combination of strength and ductility combinations.
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