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題名 | 鋁-40at.%鋅合金之時效相變化=The Isothermal Phase Transformations of an Al-40 at.% Zn Alloy in the Miscibility Gap |
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作 者 | 徐鴻文; 徐慶峰; 楊智富; 邱六合; | 書刊名 | 大同學報 |
卷期 | 27 1997.11[民86.11] |
頁次 | 頁257-271+318 |
分類號 | 440.39 |
關鍵詞 | 鋁-40at.%鋅合金; 相變化; |
語文 | 中文(Chinese) |
中文摘要 | 本研究利用恆溫電阻率量測與金相分析方法,針對鋁-40at.%鋅合金於α��+α�祠漎萓@存區中(Miscibility gap)所產生之Spinodal decomposition反應做一系列之研究。由實驗結果推斷,鋁-40at.%鋅合金在280-320℃之溫度範圍內進行Coherent spinodal decomposition, 其相變化將以下述之三階段形式進行相變化:過飽和固溶體α相→整合性(Coherent)之α'析出→非整合性 (Incoherent)之α'析出→α��+α�砥F而在 320-340℃之溫度範圍內進行Incoherent spinodal decomposition,合金將以二階段形式進行相變化:過飽和固溶體α相→非整合性之α'析出→α��+α�砟孝{序進行反應。 |
英文摘要 | In this study electrical resistivity measurement and optical microscopy were used to study the behaviors of isothermal spinodal decomposition of an Al-40 at.% Zn alloy in the miscibility gap. The results showed that, when isothermally aged in the temperature range of 280 to 320℃ the supersaturated Al-40 at.% Zn alloy decomposed by a coherent spinodal decomposition reaction, and that when aged at 330 and 340 ℃ the alloy decomposed via an incoherent spinodal decomposition reaction. It was found from the electrical resistivity versus time curves that the coherent and incoherent spinodal decomposition reactions occurring in the alloy exhibited a 3-stage and a 2-stage transition, respectively. Metallurgical observation revealed that the sequence of the coherent spinodal decomposition of the alloy was: supersaturated solid solution α' → coherent spinodal decomposed α��+α�� phases in the α' matrix →incoherent α��+α�� phases in the α' matrix→α��+α��, and that of incoherent spinodal decomposition reaction was: supcrsaturated solid solution α' → incoherent spinodal decomposed α��+α�� phases in the α' matrix →α��+ α��. |
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