Tensile properties of a newly developed high-temperature titanium alloy at room temperature and 650 °C
Tensile properties of a newly developed high-temperature titanium alloy at room temperature and 650 °C
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DOI：
10.1016/j.msea.2018.01.113
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发表时间：
2018-03-07
期刊：
影响因子：
6.4
通讯作者：
Yeom, Jong-Taek
中科院分区：
文献类型：
--
作者：
Narayana, P. L.;Kim, Seong-Woong;Yeom, Jong-Taek
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Ti 3Al和S2型硅化锆（（TiZr）6Si 3），机械性能和解理模式失效的显著损失是明显的。为了避免硅化锆的生成，我们用Hf代替Zr，开发了一种新型合金（Ti-6.5Al-3.0Sn-4.0Hf-0.2Nb-0.4Mo-0.4Si-0.1B）。在700 ℃下时效5小时成功地消除了Ti 3Al相，并大大提高了室温塑性。拉伸试验在室温和650 ℃下进行。与现有的高温钛合金相比，本合金的机械性能在环境温度和高温下的测试中得到显著改善。
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 degrees 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 degrees 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.