BRITTLE-TO-DUCTILE TRANSITION TEMPERATURE AND ITS STRAIN RAf E SENSITIVITY IN Ti-47Al-2Mn-2Nb-0.8TiB_2

Acta Metall Sin

1998, Vol. 34

Issue (3): 255-262 DOI:

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BRITTLE-TO-DUCTILE TRANSITION TEMPERATURE AND ITS STRAIN RAf E SENSITIVITY IN Ti-47Al-2Mn-2Nb-0.8TiB_2

WANG Yu; LIN Dongliang;T. L. LIN; LIU Junliang; C. C. LAW (The Public Laboratory of State Education Commission for High Temperature Materials and High Temperature Tests; Department of Materials Science;Shanghai Jiaotong University; Shanghai 200030)(Materials & Mechanics Engineering; United Technologies Coporation-Pratt & Whitney; East Hartford;CT 06108; USA)

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Abstract The effect of strain rate on the tensile yield strength and elongation of titanium aluminide has been studied. The alloy has a composition of Ti-47Al-2Mn-2Nb-0.8TiB2 (atomic fraction, %; volume fraction, %, only for TiB2) and near lamellar dricrostructure. It manifests brittle-to-ductile transition (BDT) at elevated temperature and its brittle-to-ductile transition temperature (TBDT) is positively sensitive to the strain rate. The addition of boron lowers the TBDT considerably, and the corresponding activation energy of BDT decreases to 256 kJ/mol, which is less than that of the alloy without boron (TiB2), but approximates the self-diffusion activation energy of atoms in the TiAl alloy. From additional fractography analysis and theoretical estimation, it is suggested that the BDT course of 7 titanium aluminide with the addition of boron (TiB2) is controlled by dislocation climbing.

Key words: titanium aluminide intermetullics BDT strain rate

Received: 18 March 1998

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1998/V34/I3/255

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