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On the Temperature Limits of Ni-Based Superalloys

机译：关于Ni基超合金的温度限制

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The peculiar atomic structure of y' precipitates [Ni3(Al/Ti)-L12] in Ni-based superalloys produces high-energy faults when dislocations glide them, giving their significant strength at high temperatures. The mechanisms behind the strength failure of these alloys above 800 °C are still controversial. Recent advances in atomic resolution microscopy have allowed to study these mechanisms with unprecedented detail. In our study, we have characterised a SX superalloy from RT to 1000 °C. Multiscale microscopy (TEM and SEM) are combined with physical modelling to fully understand the correlation between the strength drop and the changes in the y' shearing mechanism. Our results show that, far from previous beliefs, the initial failing of alloy strength is not a consequence of dislocation climbing. Instead, local chemical changes around the y' shearing dislocations boost their gliding, thus producing the sudden drop of strength. This new understanding can be used to beat the current temperature limits of these alloys.
机译：在Ni的高温合金中沉淀物的特殊原子结构[Ni3（Al / Ti）-112]在脱位滑动它们时产生高能缺陷，在高温下引起其显着的强度。这些合金的强度失效背后的机制仍然存在争议。原子分辨率显微镜的最新进展已经允许使用前所未有的细节研究这些机制。在我们的研究中，我们已经表征了从RT到1000°C的SX超合金。多尺度显微镜（TEM和SEM）与物理建模相结合，充分了解强度下降与Y'剪切机构的变化之间的相关性。我们的结果表明，远非先前的信仰，合金强度的初始失败不是错位攀岩的结果。相反，围绕Y'剪切脱位周围的局部化学变化促进了它们的滑动，从而产生突然的强度。这种新的理解可用于击败这些合金的当前温度限制。

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