Effects of quaternary alloying elements on the γ′ solvus temperature of Co-Al-W based alloys with fcc/L12 two-phase microstructures
Effects of quaternary alloying elements on the γ′ solvus temperature of Co-Al-W based alloys with fcc/L12 two-phase microstructures
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DOI：
10.1016/j.jallcom.2010.08.050
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发表时间：
2010-10-15
影响因子：
6.2
通讯作者：
Inui, Haruyuki
中科院分区：
文献类型：
--
作者：
Ooshima, Masahiro;Tanaka, Katsushi;Inui, Haruyuki
本文从实验和理论两方面研究了四元元素对fcc/L1(2)两相组织Co-Al-W基合金γ′溶剂温度的影响。热力学计算预测的γ′溶质温度和配分行为与实验结果吻合较好，说明了热力学计算在预测含四元Co-Al-W基合金γ′溶质温度变化方面的有效性。除Re外，所有被研究的四元元素均能提高Co-Al-W基合金的γ′溶体温度，其提高效率随四元元素的不同而不同。在四元元素中，Nb、Ta和Ti对Co-Al-W基合金的γ′溶质温度的提高最为有效，这与热力学计算的预测相一致。它们具有共同的热力学特征，即与Co的有序倾向高（但不显著），与W的相分离倾向不高。(C) 2010 Elsevier B.V.版权所有
The effects of quaternary elements on the gamma' solvus temperature of Co-Al-W based alloys with fcc/L1(2) two-phase microstructures have been investigated both experimentally and theoretically. The gamma' solvus temperature and partitioning behavior predicted by thermodynamic calculation agree well with those experimentally determined, indicating the usefulness of thermodynamic calculation in predicting the variation of the gamma' solvus temperature of Co-Al-W based alloys with quaternary elements. All investigated quaternary elements, except for Re, increase the gamma' solvus temperatures of Co-Al-W based alloys with varying efficiencies depending on quaternary element. Of the investigated quaternary elements, Nb, Ta and Ti are found to be the most effective in increasing the gamma' solvus temperature of Co-Al-W based alloys, which is consistent with the prediction from thermodynamic calculation. They have common thermodynamic characteristics that the ordering tendency with Co is high (but not significantly) and the phase-separation tendency with W is not so high. (C) 2010 Elsevier B.V. All rights reserved.