Nanofatigue behaviour of single struts of cast A356.0 foam: cyclic deformation, nanoindent characteristics and sub-surface microstructure

Schmahl, Merle; Märten, Anke; Zaslansky, Paul; Fleck, Claudia

doi:10.1016/j.matdes.2020.109016

Cited by 8 publications

(17 citation statements)

References 38 publications

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“…For local fatigue analysis, cyclic nanoindentation was performed with a Hysitron TI 950 TriboIndenter (Bruker Corporation, Billerica, Massachusetts, USA) equipped with a standard Berkovich diamond indenter tip. High‐frequency “loading” cycles ( f = 201 Hz) were combined with interspersed low‐frequency “measurement” cycles ( f = 0.05 Hz) as described in detail elsewhere 12 at maximum and minimum loads of 968 and 72 μN, respectively. Note that, in compliance with the usual notation in nanoindentation, the loads are given as positive values even though they are compressive loads.…”

Section: Methodsmentioning

confidence: 99%

“…Interestingly, we see only little local variation in the behavior between indents performed at different positions in one material, in contrast to what we observed for an Al-Si-Mg alloy. 12 This is due to the much finer, homogeneous microstructure of the materials investigated here. Thus, the nanoindents are much larger than the typical microstructural unit, and we probe volumes of interest that represent the bulk material.…”

Section: Nanoscale Cyclic Deformation Behaviormentioning

confidence: 95%

“…Nanofatigue tests were performed up to cycle numbers of 10 5 and analyzed using the method proposed previously for Al alloys. 12 Fatigue mechanisms were investigated by observations of fracture surfaces of macrofatigued samples, and texture analysis was deployed to support our conclusions on the active deformation mechanisms. Comparisons of the plastic deformation behavior on the nanoscale and macroscale helped us to evaluate to what extent cyclic nanoindentation tests can be used to predict the macrofatigue behavior.…”

Section: Introductionmentioning

confidence: 93%

“…Loading was, however, limited to 300 cycles 11 . Schmahl et al 12 presented nanofatigue experiments on an Al–Si–Mg alloy with loading up to a much higher cycle number of 10 5 …”

Section: Introductionmentioning

confidence: 99%

“…Loading was, however, limited to 300 cycles. 11 Schmahl et al 12 presented nanofatigue experiments on an Al-Si-Mg alloy with loading up to a much higher cycle number of 10. 5 In contrast to cyclic nanoindentation, a large number of macrofatigue tests has been published for Mg alloy composites, for example, Hassan et al, 8 including Mg alloy-SiC composites, 13,14 and pure Mg nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic deformation behavior of Mg–SiC nanocomposites on the macroscale and nanoscale

Hübler

Winkler

Riedel

et al. 2021

Fatigue Fract Eng Mat Struct

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Metal-ceramic nanocomposites are promising candidates for applications necessitating light weight and excellent fatigue resistance. We produced Mg-SiC nanocomposites from mechanically milled powders, yielding a homogeneous nanocrystalline structure and excellent quasistatic strength values. Little is known, however, about the fatigue behavior of such composites. Here, we used load increase tests on the macroscale to yield estimation values of the fatigue endurance limit. Fatigue strength increased significantly for the materials processed by the powder metallurgical route. We further investigated the cyclic deformation behavior under stress-controlled conditions on the macroscale and nanoscale. Cyclic nanoindentation showed that indentation depth and cyclic plastic deformation decreased with increasing reinforcement content, hinting to a higher cyclic strength and corroborating the results from the macroscopic load increase tests. Our results therefore show that cyclic nanoindentation reliably determines the plastic deformation behavior of Mg nanocomposites offering the possibility of fast material analysis.

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Section: Methodsmentioning

confidence: 99%

Section: Nanoscale Cyclic Deformation Behaviormentioning

confidence: 95%

Section: Introductionmentioning

confidence: 93%

“…Loading was, however, limited to 300 cycles 11 . Schmahl et al 12 presented nanofatigue experiments on an Al–Si–Mg alloy with loading up to a much higher cycle number of 10 5 …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cyclic deformation behavior of Mg–SiC nanocomposites on the macroscale and nanoscale

Hübler

Winkler

Riedel

et al. 2021

Fatigue Fract Eng Mat Struct

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Cyclic Nanoindentation for Local High Cycle Fatigue Investigations: A Methodological Approach Accounting for Thermal Drift

et al. 2023

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Cyclic nanoindentation allows characterizing the influence of single phases and their interactions on fatigue mechanisms. Herein, a method for high cycle fatigue testing by nanoindentation is presented. By combining high‐ and low‐frequency indentation modes, high cycle numbers are achieved while obtaining sufficient data points to reconstruct force–displacement hysteresis loops. A challenge is the stochastic course of thermal drift which is addressed by measuring drift rate in regular low‐force holding segments. Drift rates are used to correct the displacement values, yielding reproducible cyclic deformation data as it is shown for two very different materials, a ductile metal and a brittle ceramic.

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Influence of α‐Precipitate Orientation and Distribution on the Deformation Behavior of the Additively Manufactured Metastable β‐Titanium Alloy Ti‐5553 Assessed by Cyclic Nanoindentation

Alves Alcântara,

Fleck

2023

Adv Eng Mater

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The metastable β‐titanium alloy Ti‐5Al‐5V‐5Mo‐3Cr (Ti‐5553) has recently found growing interest as medical implant material due to its advantageous mechanical properties when compared to the up‐to‐date standard alloys. Besides biocompatibility, implant materials need to exhibit sufficient fatigue resistance. In this study, we apply cyclic nanoindentation up to a maximum cycle number of 105 to elucidate the influence of the local phase distribution on the cyclic deformation behavior of Ti‐5553, made by laser powder bed fusion of metals (LPBF‐M), in the (α+β)‐solution annealed state. By combining the localized cyclic mechanical loading and high‐resolution transmission electron microscopy, we unravel the influence of the presence and orientation of αp‐precipitates within the β‐grains on the cyclic deformation behavior and mechanisms. αp‐phase orientation and distribution significantly contribute to the effectiveness of the precipitates as barriers to dislocation motion. A high density and trapping of dislocations are observed at α/β‐interfaces. The occurrence and size of the pile‐up surrounding the indents are correlated with the cyclic deformation behavior, and, thus, with the presence of αp‐precipitates. The gained improved knowledge of the phase‐dependent deformation behavior helps us to better understand the fatigue performance of this alloy also on the macro‐scale.This article is protected by copyright. All rights reserved.

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Nanofatigue behaviour of single struts of cast A356.0 foam: cyclic deformation, nanoindent characteristics and sub-surface microstructure

Cited by 8 publications

References 38 publications

Cyclic deformation behavior of Mg–SiC nanocomposites on the macroscale and nanoscale

Cyclic deformation behavior of Mg–SiC nanocomposites on the macroscale and nanoscale

Cyclic Nanoindentation for Local High Cycle Fatigue Investigations: A Methodological Approach Accounting for Thermal Drift

Influence of α‐Precipitate Orientation and Distribution on the Deformation Behavior of the Additively Manufactured Metastable β‐Titanium Alloy Ti‐5553 Assessed by Cyclic Nanoindentation

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