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Re及溫度對單晶鎳基合金晶格常數(shù)及錯配度的影響
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國家自然科學(xué)基金(50571070)；遼寧省教育廳基金(2004C004)資助


Influences of Element Re and Temperatures on the Lattice Parameter and Misfit of Single-Crystal Nickel-Based Superalloys
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    摘要:

    通過對不同狀態(tài)及不同Re含量單晶鎳基合金進(jìn)行高、低溫X射線衍射譜線測定及組織形貌觀察，研究Re含量及溫度對單晶鎳基合金中γ、γ′兩相晶格常數(shù)及錯配度的影響。結(jié)果表明：鑄態(tài)合金中γ、γ′兩相有較大的晶格常數(shù)及錯配度；經(jīng)完全熱處理后，立方γ′相以共格方式嵌鑲在γ基體中，合金中兩相的晶格常數(shù)及錯配度略有減小；長期時(shí)效使γ′相粗化后，兩相之間出現(xiàn)界面位錯，使合金中兩相的晶格常數(shù)及錯配度絕對值增加。隨Re含量增加，合金中γ、γ′兩相在室溫的晶格常數(shù)增大，錯配度的絕對值減小。與γ′相相比，γ基體相有較大的膨脹系數(shù)，因此，隨溫度提高，合金中兩相晶格錯配度的絕對值增大

    Abstract:

    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 g ￠ phase is coherently embedded in the g matrix phase, and the lattice parameters and misfit of g ￠ and g phases are slightly reduced. After aged for long time, the coarsening of g ￠ phase in the alloy occurs, and the interfacial dislocations appear between g ￠ and g phases, which increases the parameters and the absolute misfit of g ￠ and g phases. The lattice parameters of g ￠ and g phases in the alloys at room temperature increase with the element Re increasing, and the absolute values of the misfit decrease. Compared with the g ￠ phase, the g matrix phase displays a bigger dilation coefficient; therefore, the lattice parameters and the absolute misfit value of g ' and g phases in the alloy increase with the temperature increasing

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王明罡,田素貴,于興福,錢本江. Re及溫度對單晶鎳基合金晶格常數(shù)及錯配度的影響[J].稀有金屬材料與工程,2010,39(2):268~272.[Wang Minggang, Tian Sugui, Yu Xingfu, Qian Benjian. Influences of Element Re and Temperatures on the Lattice Parameter and Misfit of Single-Crystal Nickel-Based Superalloys[J]. Rare Metal Materials and Engineering,2010,39(2):268~272.]
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  • 收稿日期:2009-11-16
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