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首页> 外文会议>Materials structure amp; micromechanics of fracture VIII >Effect of Alloying and Thermal Processing on Mechanical Properties of TiAl Alloys
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Effect of Alloying and Thermal Processing on Mechanical Properties of TiAl Alloys

机译：合金化和热处理工艺对TiAl合金力学性能的影响

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摘要

Two y-based TiAl alloys with 7 at.% of Nb, alloyed with 2 at.% Mo and 0.5 at.% C, were studied. A heat treatment leading to very fine lamellar microstructure was applied on both alloys. Microstructure after the heat treatment was described and mechanical properties including fatigue behaviour were measured. The as-received material alloyed with C possesses high strength and very limited ductility, especially at RT. After application of selected heat treatment it becomes even more brittle; therefore, this process could be considered as not appropriate for this alloy. On the contrary, in the case of Mo alloyed material, both strength and ductility are improved by the heat treatment at RT and usual working temperature (-750 ℃). Presence of the P phase is responsible for this effect. The selected heat treatment thus can be an alternative for this alloy to other thermomechanical treatments as high temperature forging.
机译：研究了两种含7at。％Nb，含2at。％Mo和0.5at。％C的y基TiAl合金。在两种合金上均进行了导致极细的层状微结构的热处理。描述了热处理后的微观结构，并测量了包括疲劳行为在内的机械性能。与C合金化的原样材料具有很高的强度和非常有限的延展性，特别是在室温下。应用选定的热处理后，它变得更加脆；因此，可以认为该工艺不适用于该合金。相反，在钼合金材料的情况下，通过在室温和常规工作温度（-750℃）下进行热处理，可同时提高强度和延展性。 P相的存在是造成这种效应的原因。因此，选定的热处理可以代替其他合金作为高温锻造，替代该合金。

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