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Al-Li合金彎曲過程中微觀組織結(jié)構(gòu)演變與應變集中的DIC/EBSD耦合分析
作者:
作者單位:

1.蘇州熱工研究院有限公司，清華大學;2.蘇州熱工研究院有限公司;3.西安交通大學

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基金項目:

國家自然科學基金項目（面上項目，重點項目，重大項目）,國家重點基礎研究發(fā)展計劃（973計劃）


A coupled DIC/EBSD analysis of the microstructure evolution and strain localization during bending in Al-Li alloy
Author:
Affiliation:

1.Suzhou Nuclear Power Research Institute，Tsinghua University;2.Suzhou Nuclear Power Research Institute

Fund Project:

National Key Research and Development Program of China (No. 2016YFC0801901) National Natural Science Foundation of China (No. 11705137)

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    摘要:

    本文通過SEM、EBSD和DIC相結(jié)合的方法對2060-T8鋁合金在彎曲變形過程中微觀組織結(jié)構(gòu)進行表征并對其損傷機制進行了研究。文章基于DIC和EBSD準原位技術(shù),發(fā)展了一種以彌散分布的銅粉末為標記點的同一區(qū)域應變測量和微觀結(jié)構(gòu)表征技術(shù)。實驗結(jié)果顯示合金在彎曲過程中形成了宏觀剪切帶且裂紋的擴展也是沿著宏觀剪切帶進行,造成這種現(xiàn)象的原因是由于在形變過程中在宏觀剪切帶上由于產(chǎn)生了大量的小角晶界,而裂紋沿此方向進行擴展所需的能量是最小的。

    Abstract:

    The damage mechanism of commercial 2060 (T8) aluminum alloy during bending was studied in this work. The microstructure evolution and strain localization was collected by Electron Backscattered Diffraction (EBSD) and Digital Image Correlation (DIC) methods, respectively. The new method based on the dispersion distribution of copper powders was developed, which can be used to characterize the strain distribution and microstructure evolution of the same region simultaneously. The experimental results showed that macro shear band formed during bending and the crack grow along the macro shear band, the reason for this phenomenon can be attributed to the larger volume fraction of Small Angle Grain Boundary (SAGBs) formed in the region of macro shear band, since less energy was needed if the crack propagated along the direction of macro shear bands.

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金曉,張國棟,趙彥芬,柳文波,薛飛. Al-Li合金彎曲過程中微觀組織結(jié)構(gòu)演變與應變集中的DIC/EBSD耦合分析[J].稀有金屬材料與工程,2019,47(3):716~720.[jinxiao, Zhang Guodong, ZhaoYanfeng, LiuWenbo, Xue Fei. A coupled DIC/EBSD analysis of the microstructure evolution and strain localization during bending in Al-Li alloy[J]. Rare Metal Materials and Engineering,2019,47(3):716~720.]
DOI：10.12442/j. issn.1002-185X.20170913

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  • 收稿日期:2017-10-11
  • 最后修改日期:2019-01-16
  • 錄用日期:2017-12-28
  • 在線發(fā)布日期: 2019-04-10
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