Effects of Ru on elemental partitioning and precipitation of topologically close-packed phases in Ni-based superalloys
Effects of Ru on elemental partitioning and precipitation of topologically close-packed phases in Ni-based superalloys
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DOI：
10.1016/j.scriptamat.2015.01.014
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发表时间：
2015-02
影响因子：
6
通讯作者：
Zirong Peng;I. Povstugar;K. Matuszewski;R. Rettig;R. Singer;A. Kostka;P. Choi;D. Raabe
中科院分区：
文献类型：
--
作者：
Zirong Peng;I. Povstugar;K. Matuszewski;R. Rettig;R. Singer;A. Kostka;P. Choi;D. Raabe
两种Ni基超合金（一种不含Ru，一种含有1原子%的Ru）Ru）进行了比较研究。Ru的加入阻碍了σ相在950 °C下的沉淀。Ru几乎相等地分配到γ和σ相。当加入Ru时，既没有发现反向元素分配，也没有发现γ′相的不稳定。我们认为Ru引起的γ/σ晶格失配的增加是阻碍σ相形核的主要原因。
Two Ni-based superalloys (one Ru-free and one containing 1 at.% Ru) were comparatively studied by Atom Probe Tomography and complimentary techniques. Ru addition impedes precipitation of the σ phase at 950 °C. Ru partitions nearly equally to the γ and σ phase. Neither reverse elemental partitioning nor destabilization of the γ′ phase is detected when adding Ru. We propose an increase in the γ/σ lattice misfit caused by Ru as a major reason for impeded nucleation of the σ phase.