材料科学
纳米晶材料
变形(气象学)
梁(结构)
透射电子显微镜
Burgers向量
变形机理
电子
电子束处理
复合材料
拉伸试验
极限抗拉强度
可塑性
纳米技术
微观结构
光学
物理
量子力学
作者
Sandra Stangebye,Yin Zhang,Saurabh Gupta,Ting Zhu,Olivier N. Pierron,Josh Kacher
出处
期刊:Acta Materialia
[Elsevier]
日期:2022-01-01
卷期号:222: 117441-117441
被引量:11
标识
DOI:10.1016/j.actamat.2021.117441
摘要
Transmission electron microscopy (TEM) imaging relies on high energy electrons for atomic scale resolution, however, the electrons themselves interact with and may alter the material being imaged. Using an in situ TEM MEMS-based nanomechanical testing technique, the effect of the electron beam (e-beam) on the deformation behavior of nanocrystalline Al and ultrafine-grained Au is investigated and quantified. We show that the e-beam enhances plastic deformation, leading to an increase in plastic strain rate and a decrease in true activation volume V* in Al (28 to 21b3, with b being the Burgers vector length). The e-beam has a much weaker effect on Au. The e-beam effect is not caused by knock-on damage, but rather an effective temperature increase due to additional atomic fluctuations provided by the e-beam. The effective temperature increase is larger for Al than Au. This e-beam effect does not change the deformation mechanisms, but instead accelerates the stress-driven, thermally activated plastic deformation. These experiments provide insight into the effects of the e-beam on plastic deformation in different metals and underscore the importance of understanding and quantifying these effects for proper interpretation of measured mechanical properties during in situ TEM experiments.
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