Grain and lamellar refinement in TiAl based alloy by yttrium addition

作者：Kong FT; Chen ZY; Tian J; Chen YY

来源：Transactions of Nonferrous Metals Society of China, 2003, 13: 133-135.

• TiAl based alloys
• thermodynamics
• rare earth
• microstructure

The rare earth (RE) element Y was added to binary Ti-48% Al(mole fraction) alloy by induction skull melting. The element Y was added individually 0. 5 %. The influences of rare earth metal Y on microstructure of ascast TiAl based alloy was studied by XRD, SEM, EMPA and TEM measurement methodology. The results show that most of rare earth-rich phases (AlY) are uniformly distributed along the 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 spacing of as-cast TiAl based alloy samples. The grain size of Ti-47Al-1. 2Ce alloy reaches 30 - 80 mum, and the lamellar spacing is less than 200 nm.

• 出版日期2003-5
• 单位哈尔滨工业大学