期刊
INTERMETALLICS
卷 159, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2023.107937
关键词
High-Nb TiAl; Nano; micronTi2AlC; Sintering; Mechanical properties
In this paper, the application of induction hot-pressing sintering in the fabrication of nano/micron Ti2AlC reinforced high-Nb TiAl composites was investigated. The addition of nano-C resulted in a decrease in lamellar colony size and the distribution of Ti2AlC particles at the gamma/alpha 2 lamellar interface. Heat treatment with 0.75 at% C addition significantly improved the ultimate tensile strength and elongation due to precipitation phase enhancement and grain refinement.
Induction hot-pressing sintering, as an effective sintering technique, has been rarely investigated and reported in the sintering of TiAl alloys. In this paper, in-situ nano/micron Ti2AlC reinforced high-Nb TiAl composites were fabricated via induction hot-pressing sintering, and the effect of nano-C addition on the microstructure and tensile properties was investigated. With 0.75 at% nano-C addition, the lamellar colony size decreased from 406 +/- 151 mu m to 141 +/- 62 mu m, and the Ti2AlC particles were mainly distributed at the gamma/alpha 2 lamellar interface. At 800 degrees C and 900 degrees C, the ultimate tensile strength and the elongation of the TiAl alloy were 436 MPa and 437 MPa, 0.84%, and 1.12%, respectively. However, with 0.75 at% addition (after heat treatment 900 degrees C/48 h), the ul-timate tensile strength increases by 129 MPa and 78 MPa, and the elongation increases by 0.27% and 0.64%, respectively. The significant improvement in tensile property is mainly attributed to the precipitation phase enhancement and grain refinement.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据