氧含量对Ti-36Nb-2Ta-3Zr-xO合金阻尼性能的影响

Effects of O Content on Damping Properties of Ti-36Nb-2Ta-3Zr-xO Alloys

摘要:

采用真空非自耗熔炼法制备Ti-36Nb-2Ta-3Zr-xO(x=0,0.1,0.3,0.5,wt.%)合金,通过X射线衍射仪(XRD)、万能试验机、动态热机械分析仪(DMA)等测试方法研究了氧含量对固溶态Ti-36Nb-2Ta-3Zr-xO合金组织、力学性能和阻尼行为的影响。实验结果表明：氧元素对α″相具有抑制作用。合金呈现Snoek弛豫型阻尼特征并具有良好的高温阻尼性能,其阻尼值随着氧含量的增加而提高,而峰温无明显变化。测试频率为1.0 Hz时,合金的阻尼值从0.0283(x=0)提高到0.0355(x=0.5),峰温在230℃左右。

关键词:Ti-Nb-Ta-Zr-O合金 ;高阻尼合金;Snoek弛豫

Abstract:

Ti-36Nb-2Ta-3Zr-xO (x=0, 0.1, 0.3, 0.5, wt.%) alloys were prepared by non-consumable arc-melting, and the effects of oxygen contents on microstructure, mechanical properties and damping behaviors of Ti-36Nb-2Ta-3Zr-xO were researched by X-ray diffraction (XRD), universal testing machine and Dynamic Mechanical Analyzer (DMA). The results show that the α″ phase transformation is suppressed by addition of oxygen. The damping behavior of the alloys is the typical Snoek-type relaxation and all Ti-36Nb-2Ta-3Zr-xO alloys show good damping capacities at high temperature. With the increase of oxygen content, the peak capacity of damping increases while the temperature change of the damping peak is not obvious. When the oscillating frequency is 1.0 Hz, the peak capacity of damping increases from 0.0283 (x=0) to 0.0355 (x=0.5), and the damping peak temperature is roughly 230℃.

Key words:Ti-Nb-Ta-Zr-O alloy; high damping alloy; Snoek-type relaxation