Interface affected zone for optimal strength and ductility in heterogeneous laminate

By Chong-xiang Huang, Y. F. Wang, Xiaolong Ma, Sheng Yin, H. Höppel, Mathias Göken, Xiaolei Wu, Huajian Gao, Yuntian Zhu. Materials Today, 2018

630 citations recorded by the source corpus.

Interfaces have been reported to significantly strengthen and toughen metallic materials. However, there has been a long-standing question on whether interface-affected-zone (IAZ) exists, and how it might behave. Here we report in situ high-resolution strain mapping near interfaces in a copper–bronze heterogeneous laminate, which revealed the existence of IAZs. Defined as the zone with strain gradient, the IAZ was found to form by the dislocations emitted from the interface. The IAZ width remained largely constant with a magnitude of a few micrometers with increasing applied strain. Interfaces produced both back stress strengthening and work hardening, which led to both higher strength and higher ductility with decreasing interface spacing until adjacent IAZs started to overlap, after which a tradeoff between strength and ductility occurred, indicating the existence of an optimum interface spacing for the best mechanical properties. These findings are expected to help with designing laminates and other heterogeneous metals and alloys for superior mechanical properties.

Subfields: Materials Chemistry, Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/78c52f9062ba68eed2eed4d61a1740e17b6198f6

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Citations in the corpus

In-situ observation of dislocation dynamics near heterostructured interfaces (2019, background): “It was recently observed that a negative strain gradient exists near the Cu–brass interface [13], which is opposite to the above”
Ductility by shear band delocalization in the nano-layer of gradient structure (2018, background): “In fact, such types of LSZs have been observed in layered heterostructures although their effect on work hardening was not discussed [39].”
Improved back stress and synergetic strain hardening in coarse-grain/nanostructure laminates (2018, background): “Note that the observed high back stress and extraordinary strain hardening are originated from the coupling effect around two discrete interfaces, which needs the ordered piling-up of GNDs near interface [12].”
Perspective on hetero-deformation induced (HDI) hardening and back stress (2019, background): “Recently, it has been observed that local shear bands are formed across domain boundaries [62].”
Heterostructured materials: superior properties from hetero-zone interaction (2020, background): “observed near the zone interface in a copper-brass laminated heterostructure [17], as predicted in Figure 1(b), a negative strain gradient, dε/dx < 0, was found in the same sample during an in-situ tensile test [17], i.”
Dense dispersed shear bands in gradient-structured Ni (2020, background): “They were found to have synergistic strengthening to produce yield strength higher than what is predicted by the rule of mixture (Cheng et al., 2018; Wang et al., 2018a; Wu et al., 2014b) and extra strain hardening (Li et al., 2017; Wu et al., 2014a) to retain good ductility.”