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
中科院分区:
文献类型:
--
作者:
Li Wang;Lin Song;Andreas Stark;Yong Liu;Michael Oehring;Uwe Lorenz;Florian Pyczak
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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影响因子:
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作者:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
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0.8
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通讯作者:
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