Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 22    No. 4    April 2012

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Microstructure control and mechanical properties of
directionally solidified TiAl−Nb alloys
DING Xian-fei1, ZHANG Lai-qi2, LIN Jun-pin2, HE Jian-ping2, YIN Jia1, CHEN Guo-liang2

1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory for Advanced Metals and Materials,
University of Science and Technology Beijing, Beijing 100083, China

Abstract:The double directional solidification (DS) technique was developed to control the lamellar microstructures in primary β TiAl−Nb alloys. Polysynthetically twinned (PST) crystals with lamellar boundaries parallel to or inclined 45º to the growth direction were achieved due to the complete peritectic transformation during directional solidification of the alloys with the dendritic solid/liquid interface. The PST crystals with aligned lamellar boundaries only parallel to the growth direction were produced when lamellar grains with lamellar boundaries in the same orientation were seeded by themselves under appropriate growth conditions. Low boron addition is harmful to align the lamellar orientation because of the growth of non-peritectic α phase. Due to the larger yttria particles and boride ribbons in the directionally solidified TiAl−Nb alloys, the tensile plastic elongations of the alloys are only close to 2%.


Key words: titanium aluminides; directional solidification; peritectic transformation; lamellar orientation; polysynthetically twinned crystals; mechanical properties

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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