(中南工业大学粉末冶金研究所， 长沙 410083)
摘 要: 研究了TiAl基合金不同显微组织试样在900 ℃下的拉伸力学性能。试验结果表明，在晶粒尺寸相当的前提下，与双态组织相比，细小层片状组织试样表现出良好的高温综合力学性能。采用光学金相显微镜，SEM和 TEM等检测分析仪器，详细地对试样拉伸前后的显微组织进行了分析研究。
关键字: TiAl基合金 高温拉伸 动态再结晶 显微组织 孔洞
（Powder Metallurgy Research Institute of Central South University of Technology, Changsha 410083）
Abstract:The refined full-lamellae (C grain size being 10.7μm) and duplex (8.6μm) microstructures of TiAl based alloy have been obtained by multi-step thermal-mechanical treatment technique for this alloy sample canned with middle carbon steel. The effects of microstructures on the mechanical properties of Ti-33Al-3Cr-0.5Mo(%) alloy with same degree of grain size at 900 ℃ were investigated. The test results showed that compared with the duplex microstructure samples, the TiAl based alloy samples with fully lamellae microstructure exhibited very advanced synthetical mechanical-properties at high temperature, especial the tensile elongation being over 100%. The microstructures of samples both before and after tensile test at high temperature were analyzed with optical microscope, SEM and TEM in details.
Key words: TiAl based alloy tensile test at elevated temperature dynamic recrystallization microstructure hole
