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研究了不同处理状态下V-5Cr-5Ti合金的内耗特征,并结合微观缺陷的作用机制对内耗峰进行分析。利用倒扭摆仪和多功能内耗测试仪进行内耗测试,采用X射线衍射(XRD)分析相结构,扫描电镜(SEM)观察微观组织。研究结果表明,V-5Cr-5Ti合金制备过程中无法完全消除C、O、N等杂质元素,这些元素会以间隙原子或沉淀相颗粒形式存在,进而影响合金的微观组织缺陷。在不同的处理状态下,杂质元素的不同存在形式会使合金的内耗会产生不同的变化特征。根据内耗机制,所有的内耗峰均可以由应力作用下微观缺陷的运动来揭示,比如点缺陷、位错、晶界等。
The internal friction characteristics of V-5Cr-5Ti alloy under different processing conditions were studied, and the internal friction peak was analyzed with the mechanism of microscopic defects. The internal friction test was carried out by using the inverted torsion pendulum and the multifunctional internal friction tester. The phase structure was analyzed by X-ray diffraction (XRD) and the microstructure was observed by scanning electron microscopy (SEM). The results show that the impurities of C, O, N and so on can not be completely eliminated during the preparation of V-5Cr-5Ti alloy. These elements will exist as interstitial particles or precipitated phase particles, which will affect the microstructure defects of the alloy. Under different processing conditions, the different existing forms of impurity elements will cause different internal friction characteristics of the alloy. According to the internal friction mechanism, all the friction peaks can be revealed by the movement of the microscopic defects under stress, such as point defects, dislocations and grain boundaries.