Ni-Al-Re-X (X : Cr, Mo, W, Ti, Ta, Nb, Co) 四元系合金における Re のγとγ' 相への分配比

概要

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In order to examine alloying behaviour of rhenium (Re) and its effect on the properties of Ni-based superalloys, the partitioning ratio of Re atoms between the γ and the γ' phases and also the phase stability were investigated using Ni-Al-Re-X (X : Cr, Mo, W, Ti, Ta, Nb, Co) quaternary alloys. When those elements, X, which occupy preferably either Al sites or both Ni and Al sites in the Ni_3Al(γ') compound were added to the Ni-Al-Re ternary alloys, the trend of the partitioning of the Re atoms into the γ phase became considerably high in these alloys. Also, the compositional limit of a γ+γ' two phase region in the phase diagram was found to be 3∿4(mol%) for X (X : Mo, W, Ta, Nb) and 5∿6(mol%) for Ti in Ni-Al-Re-X quaternary alloys. The results on the partitioning ratio were analyzed with the alloying vectors defined by two d-electrons parameters. As the result, it was shown that the partitioning behaviour of Re atoms in the Ni-Al-Re-X quaternary alloys were predictable using the alloying vectors.
社団法人日本鉄鋼協会の論文
1994-02-01