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U-5.7Nb合金絕熱剪切帶微觀組織結(jié)構(gòu)特征
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中國工程物理研究院,中國工程物理研究院,中國工程物理研究院,表面物理與化學(xué)重點實驗室,中國工程物理研究院,表面物理與化學(xué)重點實驗室

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中國工程物理研究院發(fā)展基金(項目號2014B0301046)


Microstructural Characterization of Adiabatic Shear Band in U-5.7Nb Alloy
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    摘要:

    利用SHPB實驗裝置對U-5.7Nb合金帽型樣品在室溫下進行動態(tài)加載,獲得U-5.7Nb合金絕熱剪切帶,采用激光共聚焦、SEM、納米壓痕以及TEM等方法開展了U-5.7Nb合金絕熱剪切帶內(nèi)組織結(jié)構(gòu)的研究。U-5.7Nb合金絕熱剪切帶寬約40um,且呈現(xiàn)蝕刻＂暗帶＂；剪切帶內(nèi)微裂紋的萌生和擴展導(dǎo)致帶內(nèi)＂破碎＂等軸晶特征組織的出現(xiàn)：剪切帶核心區(qū)域出現(xiàn)取向高度異性的納米＂晶疇＂。剪切帶內(nèi)特殊的組織結(jié)構(gòu)變化導(dǎo)致剪切帶硬度與彈性模量的不同變化趨勢。

    Abstract:

    The microstructure in adiabatic shear band (ASB) of U-5.7Nb alloy deformed at high strain rate by a split Hopkinson pressure bar (SHPB) was investigated by means of OM, SEM, and TEM. The ASB with black etching color in U-5.7Nb has been observed, and its width was about 40 um. The evolution of microcracks in ASB led to the formation of the micro-feature which like equiaxed "broken grain" with the size of 2-5um in ASB. The nanometre-sized grain domains well below 5 nm are found in the core of ASB, and the orientations of single small grain domain differ completely, even within an area of 1 μm. Microhardness of the ASB is higher than that of the matrix, but elastic modulus of ASB is lower than that of the matrix. The different trends between microhardeness and elastic modulus are caused by the change of microstructure in ASB.

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趙雅文,肖大武,何立峰,石潔,鄒東利,劉柯釗. U-5.7Nb合金絕熱剪切帶微觀組織結(jié)構(gòu)特征[J].稀有金屬材料與工程,2017,46(2):484~490.[zhaoyawen,,,,,liukezhao. Microstructural Characterization of Adiabatic Shear Band in U-5.7Nb Alloy[J]. Rare Metal Materials and Engineering,2017,46(2):484~490.]
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  • 收稿日期:2015-01-06
  • 最后修改日期:2015-01-29
  • 錄用日期:2015-09-07
  • 在線發(fā)布日期: 2017-04-10
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