Elastic-plastic properties of mesoscale electrodeposited LIGA nickel alloy films: microscopy and mechanics
| Autor: | David T. Read, Li-Anne Liew, John T. Geaney, May L. Martin, Frank W. DelRio, Nicholas Barbosa, Todd R. Christenson, Peter E. Bradley |
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| Rok vydání: | 2021 |
| Předmět: |
Digital image correlation
Materials science Mechanical Engineering Alloy Modulus Fractography 02 engineering and technology Strain rate engineering.material Strain hardening exponent 021001 nanoscience & nanotechnology Article Electronic Optical and Magnetic Materials Mechanics of Materials Ultimate tensile strength engineering Microplasticity Electrical and Electronic Engineering Composite material 0210 nano-technology |
| Zdroj: | J Micromech Microeng |
| ISSN: | 0960-1317 |
| Popis: | The elastic-plastic properties of mesoscale electrodeposited LIGA Ni alloy specimens are investigated as a function of specimen size, strain rate, and material composition. Two material compositions are studied: a high-strength fine-grained Ni-Fe alloy and a high-ductility coarse-grained Ni-Co alloy. The specimens have thicknesses of approximately 200 μm and gauge widths ranging from 75 μm to 700 μm. Tensile tests are conducted at strain rates of 0.001/s and 1/s using tabletop loading apparatuses and digital image correlation (DIC) for strain measurement. For each test condition, the apparent Young’s modulus, yield strength, ultimate tensile strength, and strain hardening exponent and strength coefficient are extracted from the tensile tests. The true strains to failure are also assessed from fractography. Size, rate, and composition effects are discussed. For most properties, the statistical scatter represented by the standard deviation exceeds the measurement uncertainty; the notable exceptions to these observations are the apparent Young’s modulus and yield strength, where large measurement uncertainties are ascribed to common experimental factors and material microplasticity. |
| Databáze: | OpenAIRE |
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