A Self-consistent Model for Nano-metallic-multilayers with He Bubbles

Abstract eng:
Nano-metallic-multilayers (NMMs) are one of the irradiation-tolerant materials due to the high ratio of interfaces that can act as effective sinks for irradiation-induced defects, like helium (He) bubbles. The mechanical behaviours of NMMs can be both affected by the interface and He bubbles, which are closely related to the layer thickness. In this paper, the macroscopic mechanical behaviours of Cu/Nb multilayer with He bubbles are explored by crystal plasticity model (CPM) coupled with the elastic-viscoplastic self-consistent (EVPSC) method. At the microscopic grain level, the dislocation forest hardening, layer thickness-dependent He bubble hardening and interface hardening are considered in the CPM for different types of individual grains (Cu and Nb). Next, the mechanical behaviors of the composite grain (equivalent inclusion) are obtained by the Mori-Tanaka method. At the macroscopic level, the self-consistent scheme is adopted to predict the macroscopic mechanical behavior of NMMs.

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