从温度高达1000 $^{\circ}$ C的纳米压痕中提取机械性能
On Extracting Mechanical Properties from Nanoindentation at Temperatures up to 1000$^{\circ}$C
摘要：
合金MCrAlY粘结涂层（其中M通常为钴和/或镍）是现代涡轮叶片的重要部件，在调节热膨胀率差异的同时赋予耐环境性。纳米压痕允许确定它们的性能，而无需传统机械测试的复杂性，但以前在涡轮机工作温度附近是不可能的。在这里，我们通过高达1000 $^{\circ}$ C的纳米压痕来确定CMSX-4和Amdry-386粘合涂层的硬度和模量。这两种材料在400 $^{\circ}$ C之前硬度恒定，随后出现相当大的软化，这在CMSX-4中归因于在布氏压头下操作的多滑移系统。蠕变行为已通过纳米压痕保持段进行了研究。高于700 $^{\circ}$ C时，观察到的蠕变指数与CMSX-4中文献值的温度依赖性相匹配。在Amdry-386中，纳米压痕产生的蠕变指数非常接近文献数据，这意味着高温纳米压痕可能在表征这些涂层和提供材料，模型和工艺优化的输入方面是强大的。
英文摘要：
Alloyed MCrAlY bond coats, where M is usually cobalt and/or nickel, are essential parts of modern turbine blades, imparting environmental resistance while mediating thermal expansivity differences. Nanoindentation allows the determination of their properties without the complexities of traditional mechanical tests, but was not previously possible near turbine operating temperatures. Here, we determine the hardness and modulus of CMSX-4 and an Amdry-386 bond coat by nanoindentation up to 1000$^{\circ}$C. Both materials exhibit a constant hardness until 400$^{\circ}$C followed by considerable softening, which in CMSX-4 is attributed to the multiple slip systems operating underneath a Berkovich indenter. The creep behaviour has been investigated via the nanoindentation hold segments. Above 700$^{\circ}$C, the observed creep exponents match the temperature-dependence of literature values in CMSX-4. In Amdry-386, nanoindentation produces creep exponents very close to literature data, implying high-temperature nanoindentation may be powerful in characterising these coatings and providing inputs for material, model and process optimisations.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
