Fatigue of metallic microdevices and the role of fatigue-induced surface oxides

B. L. Boyce; J. R. Michael; P. G. Kotula

doi:10.1016/j.actamat.2003.12.032

Fatigue of metallic microdevices and the role of fatigue-induced surface oxides

B. L. Boyce
, J. R. Michael
, P. G. Kotula

Research output: Contribution to journal › Article › peer-review

66 Scopus citations

Abstract

A new method for fatigue testing of metallic micro-electro-mechanical systems has been developed and applied to characterize the high-cycle fatigue behavior of nickel microspecimens formed by the LIGA process. Cantilever microbeams with a cross-section of 26×250 μm were tested under fully reversed loading conditions at 20 Hz. The observed stress-life curve and fatigue limit was similar to what has typically been reported for conventional bulk nickel. SEM inspection of the fatigue surface revealed that failure initiated in zones of localized extrusions and intrusions associated with persistent slip bands (PSBs). Focused ion beam machining was used to extract a cross-sectional TEM foil from the deformation zone, revealing an unexpected thick (up to 400 nm) oxide on the surface of the PSBs. This PSB oxide thickening mechanism appears to be the source of crack initiation.Published by Elsevier Ltd on behalf of Acta Materialia Inc.

Original language	English
Pages (from-to)	1609-1619
Number of pages	11
Journal	Acta Materialia
Volume	52
Issue number	6
DOIs	https://doi.org/10.1016/j.actamat.2003.12.032
State	Published - Apr 5 2004
Externally published	Yes

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title = "Fatigue of metallic microdevices and the role of fatigue-induced surface oxides",

abstract = "A new method for fatigue testing of metallic micro-electro-mechanical systems has been developed and applied to characterize the high-cycle fatigue behavior of nickel microspecimens formed by the LIGA process. Cantilever microbeams with a cross-section of 26{\texttimes}250 μm were tested under fully reversed loading conditions at 20 Hz. The observed stress-life curve and fatigue limit was similar to what has typically been reported for conventional bulk nickel. SEM inspection of the fatigue surface revealed that failure initiated in zones of localized extrusions and intrusions associated with persistent slip bands (PSBs). Focused ion beam machining was used to extract a cross-sectional TEM foil from the deformation zone, revealing an unexpected thick (up to 400 nm) oxide on the surface of the PSBs. This PSB oxide thickening mechanism appears to be the source of crack initiation.Published by Elsevier Ltd on behalf of Acta Materialia Inc.",

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T1 - Fatigue of metallic microdevices and the role of fatigue-induced surface oxides

AU - Boyce, B. L.

AU - Michael, J. R.

AU - Kotula, P. G.

PY - 2004/4/5

Y1 - 2004/4/5

N2 - A new method for fatigue testing of metallic micro-electro-mechanical systems has been developed and applied to characterize the high-cycle fatigue behavior of nickel microspecimens formed by the LIGA process. Cantilever microbeams with a cross-section of 26×250 μm were tested under fully reversed loading conditions at 20 Hz. The observed stress-life curve and fatigue limit was similar to what has typically been reported for conventional bulk nickel. SEM inspection of the fatigue surface revealed that failure initiated in zones of localized extrusions and intrusions associated with persistent slip bands (PSBs). Focused ion beam machining was used to extract a cross-sectional TEM foil from the deformation zone, revealing an unexpected thick (up to 400 nm) oxide on the surface of the PSBs. This PSB oxide thickening mechanism appears to be the source of crack initiation.Published by Elsevier Ltd on behalf of Acta Materialia Inc.

AB - A new method for fatigue testing of metallic micro-electro-mechanical systems has been developed and applied to characterize the high-cycle fatigue behavior of nickel microspecimens formed by the LIGA process. Cantilever microbeams with a cross-section of 26×250 μm were tested under fully reversed loading conditions at 20 Hz. The observed stress-life curve and fatigue limit was similar to what has typically been reported for conventional bulk nickel. SEM inspection of the fatigue surface revealed that failure initiated in zones of localized extrusions and intrusions associated with persistent slip bands (PSBs). Focused ion beam machining was used to extract a cross-sectional TEM foil from the deformation zone, revealing an unexpected thick (up to 400 nm) oxide on the surface of the PSBs. This PSB oxide thickening mechanism appears to be the source of crack initiation.Published by Elsevier Ltd on behalf of Acta Materialia Inc.

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DO - 10.1016/j.actamat.2003.12.032

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JO - Acta Materialia

JF - Acta Materialia

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Fatigue of metallic microdevices and the role of fatigue-induced surface oxides

Abstract

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