In-situ observation of dislocation dynamics near heterostructured interfaces

By Hao Zhou, Chong-xiang Huang, Xuechao Sha, Lirong Xiao, Xiaolong Ma, H. Höppel, Mathias Göken, Xiaolei Wu, Kei Ameyama, Xiaodong Han and 1 more. Materials Research Letters, 2019

152 citations recorded by the source corpus.

ABSTRACT There has been a long-standing controversy on how dislocations interact with interfaces. Here we report in-situ observations that in a Cu–brass heterostructured TEM film Frank–Read sources are the primary dislocation sources. They were dynamically formed and deactivated throughout the deformation in grain interior, which has never been reported before. This observation indicates that strain gradient near interfaces cannot be quantitatively related to the density gradient of geometrically necessary dislocations, and it was primarily produced by Frank–Read source gradient instead of dislocation pile-ups. These findings provide new insights on how to design heterostructured interfaces to enhance mechanical properties. GRAPHICAL ABSTRACT

Subfields: Biomaterials, Materials Chemistry, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/a1473bf7cc49579e83cc9d5f808003dd7fc481b1

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Citations in the corpus

Heterostructured materials: superior properties from hetero-zone interaction (2020, background): “It is revealed that dynamic generations and deactivations of Frank-Read sources occurred near the interface [18], which produced the GND gradient.”