氧化对Timetal - 21S基复合材料热机械疲劳的影响

O. Jin, W. Johnson
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引用次数: 2

摘要

对无切口准各向同性SCS-6/Timetal 21S (Ti-15Mo-2.6Nb-3Al-0.2Si)复合材料在室温、400℃和500℃下、不同保温时间(0,1和10秒)下进行等温疲劳试验。在500℃下测试的试样显示出明显的氧化,特别是沿晶界。此外,复合材料在高温下的各种物理性能发生了变化:氧化、相变、基体粘塑性流动和界面反应。对有载荷和无载荷的氧化厚度的测量表明,在相同的暴露时间下,有载荷时基体材料的氧化比无载荷时更为严重。通过简单的光谱加载试验,考察了试验温度对复合材料氧化形成的影响及其对损伤积累的影响。每个块使用不同的应用周期数:n 1和n 2 = 10、100和1000个周期。温度随应力的变化作为热循环,进一步引入复合材料的损伤并降低其寿命。随着循环次数的增加,复合材料的失效寿命也随之延长。由于温度水平变化更频繁,每个块的循环次数较少,寿命较短。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Role of Oxidation on the Thermo-mechanical Fatigue of Timetal 21S Matrix Composites
Isothermal fatigue tests were performed on unnotched quasiisotropic SCS-6/Timetal 21S (Ti-15Mo-2.6Nb-3Al-0.2Si) composites at room temperature, 400°C and 500°C with various hold times (0, 1 and 10 seconds). The specimen tested at 500°C showed significant oxidation, especially along the grain boundaries. In addition, there were changes in various physical properties of the composites at elevated temperatures: oxidation, phase transformation, viscoplastic flow of matrix, and interface reaction. The measurement of oxide thickness of both with and without load indicated that the oxidation of the matrix material was more severe with applied load than without load for the same amount of exposure time. Simple spectrum loading tests were conducted to examine the effect of test temperature on the formation of oxidation and its influence on the damage accumulation in the composites. Different numbers of applied cycles per block were used: n 1 and n 2 = 10, 100, and 1000 cycles. The change in temperature along with stress acted as thermal cycle that further introduced damages into the composites and reduced their life. As the number of applied cycles increased, the failure life of the composites was increased. The small number of cycles per block showed a shorter life due to more frequent changes in temperature level.
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