Identification of Laves phases in a Zr or Hf containing γ-γ′ Co-base superalloy

Identification of Laves phases in a Zr or Hf containing γ-γ′ Co-base superalloy
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含 γ-γ-Co 基高温合金中 Zr 或 Hf 的 Laves 相的识别

DOI:
10.1016/j.jallcom.2019.07.121
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发表时间:
2019-10
影响因子:
6.2
通讯作者:
Florian Pyczak
Florian Pyczak
中科院分区:
材料科学2区
文献类型:
--
作者:
Li Wang;Lin Song;Andreas Stark;Yong Liu;Michael Oehring;Uwe Lorenz;Florian Pyczak

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利用高能X射线衍射、能谱分析和透射电镜对γ-γ′ Co基高温合金中的ZrCo 2和HfCo 2Laves相进行了表征。它们在铸造过程中形成,在900 °C的长期退火过程中保持稳定。ZrCo 2相具有立方MgCu 2型结构,具有大量的纳米孪晶和堆垛层错,而HfCo 2具有六方MgNi 2型结构,而不是文献中的MgCu 2型。它们的化学组成强烈偏离化学计量比,并且在这些相中含有显著量的Al和W。这可能会影响原子半径比和价电子浓度,从而改变Laves相的结构。
ZrCo2and HfCo2Laves phases were found and characterized in γ-γ′ Co-base superalloys using high-energy X-ray diffraction, energy dispersive X-ray spectroscopy and transmission electron microscopy. They formed during casting and are stable during long-term annealing at 900 °C. The ZrCo2phase with a cubic MgCu2-type structure exhibits numerous nano-twins and stacking faults, while HfCo2has a hexagonal MgNi2-type structure instead of MgCu2-type in contrast to literature. Their chemical compositions strongly deviated from stoichiometry and significant amounts of Al and W are contained in these phases. These could affect the atomic radius ratio and valence electron concentration and thus change the structure of the Laves phases.
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