Effects of Heat Treatment on Microstructures and Properties of Ti811 Alloys

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Mechanical properties and microstructures of Ti811 alloys under different heat treatment conditions were studied. The results show that the microstructures of Ti811 alloy consist of α, massive β and grain-boundary β after normal annealing. The intensity and hardness decreased, while the ductility increased. After double annealing, the primary phase α reduced and needle-like secondary α〞 was formed. The massive β and grain-boundary β changed into intergranular β gradually. The microstructure was relatively uniform. Then the intensity and hardness increased, the ductility decreased when compared to general annealing. The needle-like secondary α〞and metastable β would break down into dispersed α and β after solution hardening and aging. The combination properties of alloys would be improved. According to fractography of titanium alloy, the fracture mechanism of the Ti811 alloy was dissociation - brittle intergranular fracture, which was a type of fracture between the intergranular fracture of brittle and cleavage fracture.

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Periodical:

Edited by:

Huixuan Zhang, Ye Han, Fuxiao Chen and Jiuba Wen

Pages:

1032-1035

DOI:

10.4028/www.scientific.net/AMM.117-119.1032

Citation:

H. G. Wang et al., "Effects of Heat Treatment on Microstructures and Properties of Ti811 Alloys", Applied Mechanics and Materials, Vols. 117-119, pp. 1032-1035, 2012

Online since:

October 2011

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Price:

$35.00

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