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Tensile properties of a newly developed high-temperature titanium alloy at room temperature and 650 ℃

机译:新型高温钛合金在室温和650℃下的拉伸性能

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Commonly used high-temperature near-alpha titanium alloys contain Al, Zr and Si as their alloying elements. Significant losses of mechanical properties and cleavage mode failures are evident due to the presence of Ti3Al and S2 types of zirconium silicides ((TiZr)6Si3) in these alloys. We developed a new alloy (Ti-6.5Al-3.0Sn-4.0Hf-0.2Nb-0.4Mo-0.4Si-0.1B) by replacing Zr with Hf to avoid the formation of zirconium silicides. Aging at 700 °C for five hours successfully eliminated the Ti3Al phase and substantially improved the room-temperature ductility. Tensile tests were carried out at room temperature and at 650 °C. The mechanical properties of the present alloy were significantly improved compared to those of existing high-temperature titanium alloys under testing at ambient and elevated temperatures.
机译:常用的高温近α钛合金含有Al,Zr和Si作为其合金元素。由于在这些合金中存在Ti3Al和S2类型的硅化锆((TiZr)6Si3),因此明显降低了机械性能,并导致了断裂模式破坏。我们开发了一种新合金(Ti-6.5Al-3.0Sn-4.0Hf-0.2Nb-0.4Mo-0.4Si-0.1B),通过用Hf代替Zr来避免形成硅化锆。在700°C下老化5小时成功消除了Ti3Al相,并显着提高了室温延展性。拉伸试验在室温和650℃下进行。与在环境和高温下进行测试的现有高温钛合金相比,本合金的机械性能得到了显着改善。

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