(上海交通大學(xué)材料科學(xué)系， 教育部高溫材料及高溫測試開放實驗室， 上海 200030
*Materials and Mechanics Engineering, United Technologies Company-Pratt & Whittney,
400 Main Street, East Hartford, CT 06108, U. S. A.)
摘 要: 以形變Ti47Al2Mn2Nb合金為對象， 研究了微量硼合金化和應(yīng)變速率對TiAl合金室溫力學(xué)性能的影響。發(fā)現(xiàn)添加微量(1.0%，摩爾分?jǐn)?shù))硼就能有效地細(xì)化形變Ti47Al2Mn2Nb合金的近全片層組織，顯著提高其室溫強(qiáng)度， 并在一定程度上改善室溫塑性； 變形TiAl合金不論添硼與否， 其室溫強(qiáng)度均隨應(yīng)變速率的升高而升高，而延伸率對應(yīng)變速率不太敏感；微量硼合金化和應(yīng)變速率對變形TiAl合金室溫斷裂方式無明顯影響。
關(guān)鍵字: 金屬間化合物 TiAl合金 拉伸性能 應(yīng)變速率 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
