ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 23    No. 5    May 2013

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Evolution of lamellar structure in Ti-47Al-2Nb-2Cr-0.2W alloy sheet
Bin Lu1, Lan Huang1, Yong Liu1, Xiao-peng Liang1, Bin Liu1, Yue-hui HE1, Hui-zhong LI2
(1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract: The Ti-47Al-2Nb-2Cr-0.2W alloy sheets were obtained by hot pack rolling. The as-rolled sheet has an inhomogeneous duplex microstructure composed of elongated gamma grains and lamellar colonies. Heat treatments were conducted on the as-rolled sheets. The results show that the microstructures with different sizes and grain boundary morphologies were developed after different heat treatments. A coarse fully lamellar structure can be refined if the heating time, together with the cooling rate, is appropriately controlled. The grain growth exponent is found to be approximately 0.2, and the activation energy of grain boundary migration of the alloy is around 225 kJ/mol.
Key words: TiAl alloy; heat treatment; lamellar structure; grain growth
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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