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Elastic-plastic properties of mesoscale electrodeposited LIGA nickel alloy films: microscopy and mechanics

Published

Author(s)

Li-Anne Liew, David T. Read, May Martin, Frank W. DelRio, Peter E. Bradley, Nicholas Barbosa, Todd R. Christenson, John T. Geaney

Abstract

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 high-ductility course-grained Ni-Co alloy. The specimens have thicknesses of approximately 200 um and gauge widths ranging from 75 um to 700 um. Tensile tests are conducted at strain rates of 0.001/s and 1/s using table top loading apparatuses and digital image correlation for strain measurement. For each test condition, 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 apparent Young's modulus and yield strength, where the large measurement uncertainties are ascribed to experimental factors and material microplasticity.
Citation
Journal of Micromechanics and Microengineering

Keywords

LIGA alloys, elastic-plastic properties, mesoscale mechanical testing, digital image correlation, strain rate

Citation

Liew, L. , Read, D. , Martin, M. , DelRio, F. , Bradley, P. , Barbosa, N. , Christenson, T. and Geaney, J. (2020), Elastic-plastic properties of mesoscale electrodeposited LIGA nickel alloy films: microscopy and mechanics, Journal of Micromechanics and Microengineering, [online], https://doi.org/10.1088/1361-6439/abc0ff, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929472 (Accessed September 23, 2022)
Created November 22, 2020, Updated May 7, 2021