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高應(yīng)變率下細(xì)晶W-Ni-Fe合金的力學(xué)行為與局部絕熱剪切帶的形成
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Dynamic Behavior and Adiabatic Shear Bands in Fine- Grained W-Ni-Fe Alloy under High Strain Rate Compression
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National Nature Science Foundation of China (50674106); National Natural Science Funds for Distinguished Young Scholars (50925416) and Creative Research Group of National Nature Science Foundation of China (50721003)

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    摘要:

    研究晶粒細(xì)化和添加微量稀土元素Y對93W-4.9Ni-2.1Fe合金在動態(tài)壓縮狀態(tài)下力學(xué)行為的影響，觀察分析顯微組織的變化。結(jié)果表明，93W-4.9Ni-2.1Fe合金在高應(yīng)變率加載下會出現(xiàn)應(yīng)變硬化和熱軟化現(xiàn)象，合金強度和延性隨著應(yīng)變率的增大而增加；與傳統(tǒng)W-Ni-Fe合金相比，細(xì)晶W-Ni-Fe合金在高應(yīng)變率下具有更高的合金強度和延性，同時能在較低應(yīng)變率下形成明顯的局部絕熱剪切帶。表明細(xì)化晶粒能提高W-Ni-Fe合金的強度以及絕熱剪切敏感性；另外，添加微量稀土元素Y能提高W-Ni-Fe合金在高應(yīng)變率下的強度和延性，并且在低應(yīng)變率下發(fā)生絕熱剪切，稀土元素Y的添加有利于絕熱剪切帶的形成。

    Abstract:

    The effect of grain refinement and trace yttrium addition on dynamic behavior of 93W-4.9Ni-2.1Fe alloy was investigated. The true stress-strain curves obtained from dynamic compression tests show that strain hardening and thermal softening effects are present in the alloy, and the maximum dynamic strength and elongation increase with increasing of strain rates. Compared with the conventional 93W-4.9Ni-2.1Fe alloy, the fine-grained 93W-4.9Ni-2.1Fe alloy exhibits relatively higher strength and elongation under the same compression condition. In particular, the occurrence of obvious adiabatic shear bands in fine-grained alloy under lower high-strain-rate (1900 s-1) indicates that the propensity to adiabatic shear localization are enhanced significantly by grain refinement. Additionally, trace yttrium addition can improve the dynamic strength and elongation of tungsten heavy alloy.

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范景蓮,龔 星,祁美貴,劉 濤,李樹奎,田家敏.高應(yīng)變率下細(xì)晶W-Ni-Fe合金的力學(xué)行為與局部絕熱剪切帶的形成[J].稀有金屬材料與工程,2009,38(12):2069~2074.[Fan Jinglian, Gong Xing, Qi Meigui, Liu Tao, Li Shukui, Tian Jiamin. Dynamic Behavior and Adiabatic Shear Bands in Fine- Grained W-Ni-Fe Alloy under High Strain Rate Compression[J]. Rare Metal Materials and Engineering,2009,38(12):2069~2074.]
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  • 收稿日期:2008-11-30
  • 最后修改日期:2009-08-05
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