SYMPOSIA PAPER Published: 01 January 2006
STP37547S

Effect of Aging Treatments on the Tensile Properties of Ti-35Nb-7Zr-5Ta-(0.06-0.7)O Alloys

Source

Ti-35Nb-7Zr-5Ta rods containing 0.06, 0.46, and 0.68 wt.% oxygen were produced by vacuum arc melting and forging. These were solution treated (ST) and aged in the temperature range of 427-593°C for 8 h followed by air cooling. Increasing oxygen content increased the ST yield strength (YS) from 530 to 1081 MPa. The largest increase in YS, 630MPa, in Ti-35Nb-7Zr-5Ta-0.06O observed after aging at 427°C was associated with ω phase precipitation. While the largest increases in YS, (1060 and 1288 MPa, in Ti-35Nb-7Zr-5Ta-0.46/0.68O) observed after aging at 482°C were associated with fine and somewhat inhomogeneous precipitation of the α phase, the tensile elongation remained above 8°. Aging at 538 or 593°C led to an increase in the inhomogeneity in α phase precipitation in Ti-35Nb-7Zr-5Ta-0.46/0.68O, precipitate free zones clearly being observed along with prior β grain boundaries, which served as preferred paths for early crack propagation and decreased tensile ductility.

Author Information

Qazi, JI
School of Materials Science and Engineering, Clemson University, Clemson, SC, USA
Tsakiris, V
School of Materials Science and Engineering, Clemson University, Clemson, SC, USA
Marquardt, B
Zimmer Inc., Warsaw, IN, USA
Rack, HJ
School of Materials Science and Engineering, Clemson University, Clemson, SC, USA
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Details
Developed by Committee: F04
Pages: 52–70
DOI: 10.1520/STP37547S
ISBN-EB: 978-0-8031-5511-4
ISBN-13: 978-0-8031-3497-3