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偏共析U-Nb合金的變形及應(yīng)變回復(fù)行為
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Deformation and Strain Recovery Behavior of U-Nb Alloy near the Monotectoid Composition
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    摘要:

    對U-Nb合金施加不同程度的預(yù)應(yīng)變后，利用自制的變形測量裝置研究該合金在加熱時的應(yīng)變回復(fù)行為，結(jié)合透射電子顯微鏡(TEM)、X射線衍射(XRD)儀等對U-Nb合金的變形機(jī)制及形狀記憶效應(yīng)進(jìn)行探討。結(jié)果表明：高密度的孿晶組織在變形時的相互吞并、長大及擇優(yōu)取向是該合金在形變初期的主要變形機(jī)制，并認(rèn)為U-Nb合金具有顯著的形狀記憶效應(yīng)(SME)，在加熱過程中，其最大應(yīng)變回復(fù)量可達(dá)3.2%，升溫時粗大的孿晶組織通過逆相變重新取向和分解是導(dǎo)致該合金具有形狀記憶效應(yīng)的主要原因。

    Abstract:

    Pre-deformation to various degrees was imposed to the U-Nb alloy; afterwards the strain-recovery behavior of the alloy was investigated by the self-made strain-measuring equipment. The deformation mechanism and shape memory effect (SME) of the U-Nb alloy were investigated by TEM and XRD. The results show that growth, swallow and preferred orientation of high density twins is the primary deformation mechanism for U-Nb alloy at the initial stage of deformation, and it is considered that U-Nb alloy possesses excellent shape memory effect. The maximum reversible strain reaches to 3.2% during heating; reorientation and splitting through phase reversion of enlarged twins during reheating is the main reason for the shape memory effect of U-Nb alloy

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何立峰,黃 海,任大鵬,王勤國.偏共析U-Nb合金的變形及應(yīng)變回復(fù)行為[J].稀有金屬材料與工程,2011,40(5):858~862.[He Lifeng, Huang Hai, Ren Dapeng, Wang Qinguo. Deformation and Strain Recovery Behavior of U-Nb Alloy near the Monotectoid Composition[J]. Rare Metal Materials and Engineering,2011,40(5):858~862.]
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  • 收稿日期:2010-05-11
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