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《Rare Metal Materials and Engineering》 2010-02
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Influences of Element Re and Temperatures on the Lattice Parameter and Misfit of Single-Crystal Nickel-Based Superalloys

Wang Minggang1,2,Tian Sugui1,Yu Xingfu1,Qian Benjian1 (1.Shenyang University of Technology,Shenyang 110178,China) (2.Changchun University of Technology,Shenyang 130012,China)  
By means of X-ray diffraction analysis at different temperatures and microstructure observation,an investigation has been made on the influence of element Re and temperatures on the lattice parameter and the misfit of single-crystal nickel based superalloys.Results show that the bigger lattice parameter and misfit are displayed in as-cast superalloy.After fully heat treatment,the cubic γ' phase is coherently embedded in the γ matrix phase,and the lattice parameters and misfit of γ' and γ phases are slightly reduced.After aged for long time,the coarsening of γ' phase in the alloy occurs,and the interfacial dislocations appear between γ' and γ phases,which increases the parameters and the absolute misfit of γ' and γ phases.The lattice parameters of γ' and γ phases in the alloys at room temperature increase with the element Re increasing,and the absolute values of the misfit decrease.Compared with the γ' phase,the γ matrix phase displays a bigger dilation coefficient;therefore,the lattice parameters and the absolute misfit value of γ' and γ phases in the alloy increase with the temperature increasing.
【Fund】: 国家自然科学基金(50571070);; 辽宁省教育厅基金(2004C004)资助
【CateGory Index】: TG146.15
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