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采用Thermo-calc热力学软件模拟了Waspaloy合金中最佳W元素添加量,并利用万能试验机、扫描电镜(SEM)和X射线衍射仪(XRD)研究了在添加W元素后Waspaloy合金力学性能变化以及对γ’相的影响。研究结果表明:添加W元素能提高Waspaloy合金中γ’相的溶解温度和在700℃时的析出量,添加2%(质量分数)的W元素最有利于合金性能的改善,且不会引入新的析出相。W元素在Waspaloy合金中主要分布于基体和γ’相中,分配比例约为1∶1,进入γ’相中的W原子会占据一部分Ti原子位置,并促进Al原子进入γ’相;添加W元素后,合金中粗颗粒γ’相出现几率降低,γ’相颗粒尺寸在45~50 nm范围内分布更为集中;W能降低合金中γ’/γ两相之间的错配度,对γ’相形貌没有明显影响。在Waspaloy合金中添加W元素后,合金的拉伸性能和持久断裂强度都有一定程度的提高。
The optimum addition of W in Waspaloy alloy was simulated by Thermo-calc thermodynamic software. The changes of mechanical properties of Waspaloy alloy after W addition were studied by universal testing machine, scanning electron microscope (SEM) and X-ray diffraction (XRD) Effect on the γ ’phase. The results show that the addition of W can improve the dissolution temperature of γ ’phase and the amount of precipitation at 700 ℃ in Waspaloy alloy. The addition of 2wt% W is the most favorable for the improvement of alloy properties without introducing new Precipitation phase. The W element is mainly distributed in the matrix and γ ’phase in Waspaloy alloy with a distribution ratio of about 1: 1. The W atoms entering the γ’ phase occupy a part of the Ti atoms and promote the Al atoms into the γ ’phase. The addition of W Element, the γ ’phase of the coarse particles in the alloy appears to be less likely to occur and the particle size of the γ’ phase is more concentrated in the range of 45 to 50 nm. W can reduce the mismatch between the γ ’/ γ phases in the alloy. γ ’phase morphology did not significantly affect. The addition of W element to Waspaloy alloy improved the tensile properties and long-term rupture strength of the alloy to a certain degree.