The outstading mechanical properties of bimodal ultrafine eutectic composites (BUECs) containing length scale hierarchy in eutectic structure were demonstrated by using AFM observation of surface topography with quantitative height measurements and were interpreted in light of the details of the deformation mechanisms by three different interface modes. It is possible to develop a novel strain accommodated eutectic structure for triggering three different interface-controlled deformation modes; (I) rotational boundary mode, (II) accumulated interface mode and (III) individual interface mode. A strain accommodated microstructure characterized by the surface topology gives a hint to design a novel ultrafine eutectic alloys with excellent mechanical properties.
Bibliographical noteFunding Information:
This work was supported by the Global Research Laboratory (GRL) and the National Research Foundation of Korea (NRF) grant (No. 2013R1A2A2A05006550). One of the authors, Y. Seo, specially thanks to the support from Priority Research Centers Program through the National Research Foundation of Korea (NRF) (No. 2010-0020207).
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