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金屬玻璃剪切帶中應(yīng)力誘導(dǎo)的納米缺陷形成
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Formation of Stress-Induced Nano Defects in Shear Bands of Metallic Glasses
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National Natural Science Foundation of China (50601011); National Basic Research Program of China (2007CB607603); Program for NCETs in University (NCET-06-0484); NSF of Jiangsu Province (BK2006533); Fundamental Research Funds for the Central Universities (JUSRP20914)

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    摘要:

    以非晶鋯基金屬玻璃薄帶制備透射電子顯微鏡樣品，并利用透射電鏡找到在彎曲樣品過程中產(chǎn)生的剪切帶。高分辨透射電鏡技術(shù)揭示在剪切帶中存在著納米級的空洞類和高密度區(qū)域缺陷。這些缺陷被認(rèn)為是在機(jī)械負(fù)載和外應(yīng)力移除過程中應(yīng)力激發(fā)的自由體積演化而成的，其演化過程可以通過和在相同的金屬玻璃樣品上的熱退火過程作類比來定性地理解

    Abstract:

    Transmission electron microscopy (TEM) specimens of Zr-based metallic glasses were prepared from amorphous ribbons. Shear bands produced by bending these specimens were located by TEM. High resolution transmission electron microscopy analysis indicates the existence of nanoscale void-like defects and high-density areas in shear bands. The formation of these defects is believed resulting from the evolution of stress-activated free volumes during the mechanical loading and the removal of external stress, which can be understood by comparing the stress-induced processes in shear bands in analogy with the thermal annealing effects on similar metallic glasses

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顧曉峰,王 軍,秦衛(wèi)東,寇宏超,李金山,周 廉.金屬玻璃剪切帶中應(yīng)力誘導(dǎo)的納米缺陷形成[J].稀有金屬材料與工程,2010,39(6):941~944.[Gu Xiaofeng, Wang Jun, Qin Weidong, Qin Weidong, Li Jinshan, Zhou Lian. Formation of Stress-Induced Nano Defects in Shear Bands of Metallic Glasses[J]. Rare Metal Materials and Engineering,2010,39(6):941~944.]
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  • 收稿日期:2009-06-14
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