Microstructure and mechanical properties of beta TiAl alloys elaborated by spark plasma sintering

作者：Liu Xinwang; Zhang Zhaolong; Sun Rui; Liu Fuchu; Fan Zitian^*; Niu Hongzhi

来源：Intermetallics, 2014, 55: 177-183.

DOI：10.1016/j.intermet.2014.07.022

• Titanium aluminides, based on TiAl
• Mechanical properties at room temperature
• Sintering
• Microstructure

The microstructure evolution and room temperature mechanical property of beta containing Ti-44Al-3Nb-1Mo-1V-0.2Y alloy consolidated by spark plasma sintering was studied. Pre-alloyed powders were sintered for 2 min in the range 900-1250 degrees C under 100 MPa. It was found that duplex and Iamellar microstructures were obtained depending on the SPS temperature. The duplex microstructure formed at 1150 degrees C and 1175 degrees C, and the lamellar structure was achieved above 1200 degrees C. However, coarsening of lamellar colonies occurred with further increasing of the sintering temperature. The specimen with fine lamellar colonies exhibited a relatively high compressive strength, whereas the one with duplex microstructure showed a superior final strain.

• 出版日期2014-12
• 单位西北有色金属研究院