Effect of Rare Earth on Microstructure of γ-TiAl Intermetallics
来源期刊：JOURNAL OF RARE EARTHS2003年第2期
论文作者：田竞 陈玉勇 孔凡涛 陈子勇 贾均
Key words：metal materials; TiAl based alloy; microstructure; grain size; lamellar thickness; rare earths;
Abstract: The rare earth (RE) elements (Ce, La) were added to binary Ti-47% Al alloys (atomic fraction) by Induction Skull Melting. The element Ce of 1.0 atomic percent was added individually, and La of 0.2 atomic percent was added individually. This article studied the influences of rare earth metal (Ce, La) on microstructure of as-cast TiAl based alloy by XRD, SEM, EMPA and TEM measurement methodology. The results show that most of rare earth-rich phases (AlCe, AlLa) are uniformly distributed in grain boundary in the shape of discontinuous network, and some particles of rare earth-rich phases within the grains are mainly ellipsoids. In addition, rare earth element can obviously refine the grain size and the lamellar thickness of as-cast TiAl based alloy samples. The grain size of Ti-47Al-1.0Ce-0.2La alloy reaches about 30～80 μm, and the lamellar thickness of its γ phase and α2 phase are less than 200 and 20 nm, respectively.
田竞1，陈玉勇1，孔凡涛1，陈子勇1，贾均1
(1.National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract:The rare earth (RE) elements (Ce, La) were added to binary Ti-47% Al alloys (atomic fraction) by Induction Skull Melting. The element Ce of 1.0 atomic percent was added individually, and La of 0.2 atomic percent was added individually. This article studied the influences of rare earth metal (Ce, La) on microstructure of as-cast TiAl based alloy by XRD, SEM, EMPA and TEM measurement methodology. The results show that most of rare earth-rich phases (AlCe, AlLa) are uniformly distributed in grain boundary in the shape of discontinuous network, and some particles of rare earth-rich phases within the grains are mainly ellipsoids. In addition, rare earth element can obviously refine the grain size and the lamellar thickness of as-cast TiAl based alloy samples. The grain size of Ti-47Al-1.0Ce-0.2La alloy reaches about 30～80 μm, and the lamellar thickness of its γ phase and α2 phase are less than 200 and 20 nm, respectively.
Key words:metal materials; TiAl based alloy; microstructure; grain size; lamellar thickness; rare earths;
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