Abstract Compressive stress–strain responses of stoichiometric and off-stoichiometric B2-ordered Ti–Mo–Al alloys over the temperature range 973–1373 K were examined to investigate the effects of composition and temperature on the mechanical behavior. The Ti–Mo–Al alloys exhibited impressive yield strengths at elevated temperatures, e.g., 818 MPa for Ti50Mo35Al15 at 1073 K and 490 MPa for Ti50Mo25Al25 at 1273 K. Positive temperature dependence of yield strength was observed in Ti50Mo25Al25 below 1273 K but it had not been seen in either Ti60Mo25Al15 or Ti50Mo35Al15 throughout the test temperatures. Dislocation analyses of the compressed specimens indicated that the Ti–Mo–Al alloys primarily deformed via 111 > slip. The mechanisms responsible for the variations of mechanical properties with composition and temperature are discussed by correlating with the antisite defects.

中文翻译：

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B2有序Ti-Mo-Al合金的高温力学行为

摘要 研究了化学计量比和非化学计量比 B2 有序 Ti-Mo-Al 合金在 973-1373 K 温度范围内的压缩应力-应变响应，以研究成分和温度对机械性能的影响。Ti-Mo-Al 合金在高温下表现出令人印象深刻的屈服强度，例如，Ti50Mo35Al15 在 1073 K 时为 818 MPa，Ti50Mo25Al25 在 1273 K 时为 490 MPa。在低于 1273 K 的 Ti50Mo25Al25 中观察到屈服强度的正温度依赖性，但没有在整个测试温度下，在 Ti60Mo25Al15 或 Ti50Mo35Al15 中都可以看到。压缩试样的位错分析表明，Ti-Mo-Al 合金主要通过 111 > 滑移变形。