Fabrication of Dense Ultrafine TiAl Alloys by Spark Plasma Synthesis from Mechanically Activiated Po

• 作 者: XIA Li DING Hui SHI Yuxiang RE
• 机 构: Department of Materials Engineering, Wuhan University, Wuhan 430072, China;School of Physics, Wuhan
• 出 处: 武汉理工大学学报（材料科学版）（英文版）
• 发表日期: 2007年3期
• 关键词: titanium aluminides mechanical activation spark plasma sintering (SPS)

Powder of Ti-46at%Al alloy was synthesized through mechanical activation(MA) and then sintered and concurrently consolidated in a short sintering time of 900 s by using a spark plasma sintering(SPS) process. The XRD and SEM profiles show that the microstructures of TiAl alloys contained γ TiAl and small amount α-2 Ti3Al phase, whose amount can be controlled by the sintering temperature. The compacts retained the original fine-grained fully densified bodies by avoiding an excessively high sintering temperature. The alloys sintered at higher temperature with this process showed a coarser microstructure. So it is possible to produce dense nanostructured TiAl alloys by mechanically activated spark plasma sintering (MASPS) within a very short period of time.