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Effect of Heat Treatment Conditions on Microstructure and Fracture Toughness of a Cast Ti-Al Alloy
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Effect of Heat Treatment Conditions on Microstructure and Fracture Toughness of a Cast Ti-Al Alloy

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Abstract:

Ti-45.5Al-2Cr-4Nb-0.4B alloy was cast by vacuum arc melting at high purity Ar atmosphere using high purity sponge Ti, granular Al (99.99%), flake Nb (99.9%), lump Cr (99.9%) and TiB2 (99.5%) and subsequently heat-treated to obtain a couple of microstructures, i.e. lamellar and near γ. The heat treatment consisted of annealing at a high temperature (1200 ~ 1330oC) of different phase fields for 24 hrs and stabilizing at 900oC for 4 hrs followed by air cooling. Fracture toughness was measured on the specimens with different microstructures at room temperature. The value of KQ of specimen with fully lamella structure was obtained as 18.68 MPa √m, much higher than that of specimen with near γ structure (11.84 MPa √m). It was also revealed that the KQ value was decreased as the annealing temperature decreased.

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Periodical:

Advanced Materials Research (Volumes 26-28)

Pages:

189-192

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.26-28.189

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Online since:

October 2007

Authors:

Tae Kwon Ha, Jae Young Jung

Keywords:

Fracture Toughness, Heat Treatment, Lamellar, Microstructure, Near Gamma, TiAl

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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