(上海交通大学材料科学系， 教育部高温材料及高温测试开放实验室， 上海 200030
*Materials and Mechanics Engineering, United Technologies Company-Pratt & Whittney,
400 Main Street, East Hartford, CT 06108, U. S. A.)
摘 要: 以形变Ti47Al2Mn2Nb合金为对象， 研究了微量硼合金化和应变速率对TiAl合金室温力学性能的影响。发现添加微量(1.0%，摩尔分数)硼就能有效地细化形变Ti47Al2Mn2Nb合金的近全片层组织，显著提高其室温强度， 并在一定程度上改善室温塑性； 变形TiAl合金不论添硼与否， 其室温强度均随应变速率的升高而升高，而延伸率对应变速率不太敏感；微量硼合金化和应变速率对变形TiAl合金室温断裂方式无明显影响。
关键字: 金属间化合物 TiAl合金 拉伸性能 应变速率 硼
ROOMTEMPERATURE MECHANICAL PROPERTIES OF
WROUGHT TiAl ALLOY
（Department of Materials Science,
The Open Laboratory of Education Ministry for HighTemperature Materials and Tests,
Shanghai Jiao Tong University, Shanghai 200030, P. R. China
*Materials and Mechanics Engineering, United Technologies CompanyPratt & Whittney,
400 Main Street, East Hartford, CT 06108, U. S. A.）
Abstract:Wrought Ti47Al2Mn2Nb alloy was chosen to investigate the effects of trace (1.0%, mole fraction) boron addition and the strain rate on tensile properties of TiAl alloy at room temperature. It was found that the addition of boron
effectively refines grains in the alloy, increases its strength and improves its ductility; on the other hand, the strengths of the two alloys, doped or undoped with boron, increase with the strain rate while tensile ductility is not so much sensitive to the strain rate as the strength; moreover, neither microalloying with boron nor a change in the strain rate from 10-5 to 10-1 s-1 produces an obvious change in fractography at room temperature.
Key words: intermetallics titanium aluminide tensile properties strain rate boron
