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強(qiáng)度錯配雙界面約束條件下純鋁層TEM原位拉伸觀察
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TG146.4

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國家自然科學(xué)基金委員會“國家門然科學(xué)基金”資助（501701051,59925104）


In-Situ TEM Tension Observation of Pure Al Sheet Constrained by Bi-Interface with Strength Match
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    摘要:

    利用透射電鏡（TEM）中的原位拉伸臺對純金屬鋁及受強(qiáng)度錯配雙界面約束的純鋁層拉伸過程進(jìn)行觀察。結(jié)果表明：純金屬鋁拉伸過程中裂端形成微孔洞后即與主裂紋連接，在界面約束條件下，裂端形成微孔后并非立即與主裂紋連通，而是在更前沿位置產(chǎn)生更多的微孔洞，即發(fā)生連續(xù)孔洞化。拉伸過程中，裂尖鈍化與銳化的現(xiàn)象共存，隨著中間純鋁層厚度的降低，裂端發(fā)射的位錯在其周圍晶界形成越來越嚴(yán)重的塞積，大大提高了晶界及裂端前沿應(yīng)力場強(qiáng)度，引起中間純鋁層的脆化。

    Abstract:

    In-situ TEM tension was used to observe the deformation of bulk pure Al and that constrained by bi-interface.The results show that cavity is joined with principal crack just after forming in front of crack tip in bulk Al.Different from bulk Al,however,more cavities will generate in front of the cavity in constrained Al sheet by bi-interface before main crack propagates,that is cavitations and blunting and sharpening of main crack coexist in tension process.Dislocations emitted from crack tip pile up more remarkably at the grain boundaries around crack tip with decrease of thickness of pure Al sheet resulting in obvious inerease of stress concentration,which leads to brittleness of pure Al sheet.

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李梁 韓禮紅 孫軍.強(qiáng)度錯配雙界面約束條件下純鋁層TEM原位拉伸觀察[J].稀有金屬材料與工程,2005,34(8):1196~1199.[Li Liang;Han LiGong;Sun Jun. In-Situ TEM Tension Observation of Pure Al Sheet Constrained by Bi-Interface with Strength Match[J]. Rare Metal Materials and Engineering,2005,34(8):1196~1199.]
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  • 收稿日期:2004-02-09
  • 最后修改日期:2004-02-09
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