Obtaining of a fine near-lamellar microstructure in TiAl alloys by Spark Plasma Sintering |
| |
| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. School of Aeronautics and Astronautics, Central South University, Changsha 410083, China;3. School of Materials Science and Engineering, Central South University, Changsha 410083, China;4. School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China |
| |
| Abstract: | This work presents a study of the Spark Plasma Sintering of a boron and tungsten containing alloy (Ti49,92Al48W2B0,08, called IRIS) as a function of the sintering temperature. Microstructures of sintered alloys are analyzed by scanning and transmission electron microscopies. Investigations mainly focus on a fine near-lamellar microstructure. Attention is paid to both characteristic dimensions of this microstructure and orientation relationships between various phases.The fine near-lamellar microstructure is formed by lamellar grains surrounded by extended γ zones containing β0 precipitates. The size of lamellar grains ranges from 35 to 45 μm while the width of the borders remains between 5 and 10 μm. Effects of both boron addition and sintering temperature are studied. Orientation relationships between γ lamellae and γ grains in the borders, as well as between the γ matrix and the β0 precipitates are investigated. As a result of these investigations, a formation mechanism of this microstructure is proposed and discussed. The origin of the grain growth limitation during the SPS processing is particularly analyzed. |
| |
| Keywords: | Intermetallics (aluminides) Alloy design Powder metallurgy Microstructure Electron microscopies Scanning Transmission |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
