Strengthening behavior of beta phase in lamellar microstructure of TiAl alloys |
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Authors: | Hanliang Zhu D Y Seo K Maruyama |
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Affiliation: | (1) Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Skudai, Johor, 81310, Malaysia;(2) Industrial Technology Division, Malaysian Institute for Nuclear Technology Research, Bangi, Kajang, Selangor, 43000, Malaysia |
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Abstract: | β phase can be introduced to TiAl alloys by the additions of β stabilizing elements such as Cr, Nb, W, and Mo. The β phase
has a body-centered cubic lattice structure and is softer than the α2 and γ phases in TiAl alloys at elevated temperatures, and hence is thought to have a detrimental effect on creep strength.
However, fine β precipitates can be formed at lamellar interfaces by proper heat treatment conditions and the β interfacial
precipitate improves the creep resistance of fully lamellar TiAl alloys, since the phase interface of γ/β retards the motion
of dislocations during creep. This paper reviews recent research on high-temperature strengthening behavior of the β phase
in fully lamellar TiAl alloys. |
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