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首页> 外文期刊>Materials Science and Engineering >Low-cycle fatigue of single crystal nickel-based superalloy - mechanical testing and TEM characterisation
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Low-cycle fatigue of single crystal nickel-based superalloy - mechanical testing and TEM characterisation

机译：单晶镍基高温合金的低周疲劳-力学性能测试和TEM表征

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Low-cycle fatigue (LCF) is studied for a nickel-based single-crystal superalloy in this paper, with a focus on the effect of crystal orientation and temperature. Specifically, cyclic deformation of the alloy was compared for [001]- and [111]-oriented samples tested under strain-controlled conditions at room temperature and 825 degrees C. Either cyclic hardening or softening was observed during the LCF process, depending on the strain amplitude, crystallographic orientation and temperature. LCF life was also reduced significantly by changing loading orientation from [001] to [111] or increasing temperature to 825 degrees C. Employing a comprehensive study with transmission electron microscopy (TEM), a connection between microstructure and mechanical behaviour of the alloy is discussed. It was found that the processes of gamma'-precipitate dissolution and dislocation recovery were responsible for cyclic softening. Alignments and pile-ups of dislocations in the gamma matrix, which prohibited their movement and reduced the interaction of dislocations on different slip systems, contributed to cyclic hardening.
机译：本文研究了镍基单晶高温合金的低周疲劳（LCF），重点研究了晶体取向和温度的影响。具体来说，比较了在室温和825摄氏度的应变控制条件下测试的[001]和[111]取向样品的合金循环变形。在LCF过程中，观察到合金的循环硬化或软化，具体取决于应变幅度，晶体学取向和温度。通过将加载方向从[001]更改为[111]或将温度提高至825摄氏度，LCF寿命也显着降低。使用透射电子显微镜（TEM）进行全面研究，讨论了合金的微观结构与力学行为之间的联系。发现γ'-沉淀的溶解和位错恢复的过程是循环软化的原因。 γ矩阵中位错的排列和堆积阻止了它们的移动并减少了不同滑移系统上位错的相互作用，这有助于循环硬化。

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