Optimizing ductility and fracture of amorphous metal thin films on polyimide using multilayers
Source abstract
Abstract
Aluminum–manganese (Al–Mn) thin films with manganese concentration up to 20.5 at.% were deposited on polyimide (PI) substrates. A variety of phases, including supersaturated fcc (5.2 at.% Mn), duplex fcc and amorphous (11.5 at.% Mn), and completely amorphous phase (20.5 at.% Mn) were obtained by adjusting alloying concentration in the film. Tensile deformation and subsequent fracture of strained Al–Mn films on PI were investigated experimentally and by finite element simulations. Compared with crystalline and dual phase counterparts, amorphous thin film exhibits the highest fracture stress and fracture toughness, but limited elongation. Based on the fracture mechanism model, a multilayer scheme was adopted to optimize the ductility and the fracture properties of the amorphous film/PI system. It was found that by sandwiching the amorphous film (20.5 at.% Mn) between two ductile Cu layers, the elongation can be improved by more than ten times, and the interfacial fracture toughness by more than twenty times. This design provides important guidelines to obtain optimized mechanical properties of future flexible electronics devices.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Metal and Thin Film Mechanics · Copper Interconnects and Reliability · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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