Al元素对Ti-V-Cr系阻燃钛合金热强性影响的研究

Research Effect of Alloying Elements Al on Heat Resistance of Ti-V-Cr Burn-Resistant Titanium Alloy

摘要:

制备了Ti-25V-15Cr-0．2Si和Ti-25V-15Cr-2Al-0．2Si2种阻燃钛合金，分别测试其在不同热暴露和蠕变工艺条件下的热稳定性能和蠕变性能，并观察了组织。结果表明，Al元素提高了Ti—V-Cr系阻燃钛合金的室温力学性能，降低了热稳定性能和抗蠕变性能；在实验的热稳定和蠕变工艺参数下，2种合金中只存在a相和Ti5Si3相，没发现其他过渡相和中间化合物；在热暴露和蠕变过程中，组织稳定性降低，Al元素的添加促进了a相和Ti5si，相的析出，降低了Ti-V-Cr系阻燃钛合金抗蠕变性能和热稳定性能。

Abstract:

Two Ti-V-Cr system burn-resistant titanium alloys of Ti-25V-15Cr-0.2Si and Ti-25V-15Cr-2Al-0.2Si were prepared. Their creep, thermal stability properties and microstructure were tested under different conditions. The result shows that Al strengthened the roomtemperature mechanical properties and reduced the creep and thermal stability properties of Ti-V-Cr system burn-resistance alloys. The microstructures of two alloys only contained a phase and Ti5Si3 phase under the experiment condition, other transition phases and intermetallic compounds were not found. During creep and thermal exposure processes, the decrease of structure stability and much more precipitated phases are attributed to the effect of alloying element Al which caused the reduction of thermal stability and creep properties of Ti-V-Cr burn resistant titanium alloy.