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Al-Zr中間合金熱處理過程的微觀相場模擬
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國家自然科學(xué)基金項目(50671084); 陜西省自然科學(xué)基金項目資助


Microscopic Phase-Field Simulation of the Heat Treatment Process for Al-Zr Intermetallic Compound
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    摘要:

    利用微觀相場方法對3種不同成分的Al-Zr合金的時效過程進行計算機模擬。結(jié)果顯示：Al-3at%Zr、Al-6at%Zr和Al-15at%Zr 3種合金時效過程中形成的L12結(jié)構(gòu)的Al3Zr有序相的沉淀機制分別為失穩(wěn)分解機制、失穩(wěn)分解加非經(jīng)典形核混合機制、非經(jīng)典形核機制；有序相形成經(jīng)歷的過程為過飽和固溶體→G.P.區(qū)→非化學(xué)計量比有序相→化學(xué)計量比有序相，開始階段形成的G.P.區(qū)中，一些尺寸和濃度較小的區(qū)域隨著演化的進行逐漸溶解消失，一些尺寸和濃度較大的則進一步長大有序化并最終形成化學(xué)計量比有序相

    Abstract:

    The aging processes of three different component Al-Zr alloys of Al-3at% Zr, Al-6at%Zr and Al-15at%Zr were simulated through the microscopic phase-field dynamic model. The results indicate that the precipitation mechanisms of the Al3Zr ordered phase of L12 structure are the spinodal decomposition, the mixed mechanism of spinodal decomposition and non-classical nucleation, and the non-classical nucleation for the Al-3at% Zr, Al-6at%Zr and Al-15at%Zr alloys, respectively. The ordered phase is in the order of supersaturated solid solution, G.P. zone, nonstoichiometric ordered phase, and stoichiometric ordered phase. At the initial stage of evolution, the smaller G.P. zone of lower concentration dissolved but the larger G.P. zone of higher concentration grew up to form an ordered phase at last

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張利鵬,陳 錚,王永欣,盧艷麗,趙 彥,霍進良. Al-Zr中間合金熱處理過程的微觀相場模擬[J].稀有金屬材料與工程,2009,38(2):242~246.[Zhang Lipeng, Chen Zheng, Wang Yongxin, Lu Yanli, Zhao Ya, Huo Jinliang. Microscopic Phase-Field Simulation of the Heat Treatment Process for Al-Zr Intermetallic Compound[J]. Rare Metal Materials and Engineering,2009,38(2):242~246.]
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  • 收稿日期:2008-01-23
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