Fatigue behavior of aged and solution treated AZ61 Mg alloy at small length scale using nanoindentation

Jain, Shubhra; Gokhale, Aditya; Jain, Jayant; Singh, Sudhanshu S.; Hariharan, K.

doi:10.1016/j.msea.2016.12.111

Cited by 18 publications

(10 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…because of the relatively lower σ concentration and larger indentation–process zone on the contact surface . There was no mandatory sample size requirement in the nanoindentation test, but it was necessary to ensure full contact between the membrane and the substrate glass . Four sets of nanoindentation experimental schemes were designed: Rate‐dependence experiments: The membrane was pressed to a target h of 2000 nm under loading ε rates of 0.001, 0.002, 0.005, and 0.01 second −1 followed a holding time of 20 s and then unloaded with the same rate of loading. σ‐Relaxation experiments: Four peak holding h s (2000, 3000, 4000, and 5000 nm) were applied to the sample at a constant loading stain rate of 0.01 second −1 , and a holding time of 100 s was recorded to measure the changing load ( p ) with time. Creep experiments: The creep behaviors were measured at different holding peak p s (200, 400, 600, and 800 μN), respectively; then, the creep changes with holding time (100 s) were compared. Fatigue experiments: Four loading frequencies (0.0125, 0.125, 0.25, and 0.5 Hz) were adopted within 400 s via a triangle wave‐loading path, and the damage of the material was explored. …”

Section: Methodsmentioning

confidence: 99%

Mechanical responses in the length direction and thickness direction of quaternary 1,4‐diazabicyclo‐[2.2.2]‐octane polysulfone alkaline anion‐exchange fuel‐cell membranes

Zhang

Tian

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

A quaternary 1,4-diazabicyclo-[2.2.2]-octane polysulfone (QDPSU) alkaline anion-exchange fuel-cell membrane was synthesized. Nanoindentation and uniaxial tension methods were used to test the mechanical properties of this membrane in both the thickness direction and length direction at 26 C and 40% relative humidity. We found that the QDPSU membrane exhibited remarkable viscoelastic properties with significant loading rate-dependent behavior and time-dependent behavior (creep-relaxation). The value of compression creep rates and compression relaxation rates of the QDPSU membrane were measured to be about 0.2 by a spherical indenter and changed very little with different holding loads. Compared with Nafion, a most widely used fuel-cell membrane, the QDPSU alkaline anion-exchange membrane showed a better creep resistance. During the nanoindentation fatigue test, the variation of depths with the indentation cycles were divided into a rising primary region, a steady-state secondary region, and a continuous declining region. This was different from the uniaxial tension fatigue test. The cross-scale and cross-direction mechanical study from this work will help provide new evidence for bridging the gap between nanoindentation and uniaxial tensile testing.

show abstract

Section: Methodsmentioning

confidence: 99%

Mechanical responses in the length direction and thickness direction of quaternary 1,4‐diazabicyclo‐[2.2.2]‐octane polysulfone alkaline anion‐exchange fuel‐cell membranes

Zhang

Tian

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…For bulk materials, a common approach has been multicycle nanoindentation with an incremental load. [26][27][28][29][30][31] The tests were performed with very low maximum numbers of cycles in the range of 10-1000. A dynamic mechanical analysis mode was used to further increase the number of cycles up to 8 Â 10 5 .…”

Section: Introductionmentioning

confidence: 99%

“…They measured the drift prior to their experiments at a low load and used the obtained value for the drift correction. [ 26,29 ] Others adjusted the method slightly by extending the holding segment until the thermal drift fell below a certain threshold before starting the cyclic indentation process. [ 25 ] Alternatively, drift monitoring segments were placed at the end of the fatigue test, following cyclic loading of the material, or both approaches were combined and the drift was measured at the beginning and the end.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

View full text Add to dashboard Cite

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.

show abstract

“…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%

“…So far only one study reports on the nanofatigue behavior of a Mg alloy using nanoindentation. 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%

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

Hübler

Winkler

Riedel

et al. 2021

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

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.

show abstract

Fatigue behavior of aged and solution treated AZ61 Mg alloy at small length scale using nanoindentation

Cited by 18 publications

References 24 publications

Mechanical responses in the length direction and thickness direction of quaternary 1,4‐diazabicyclo‐[2.2.2]‐octane polysulfone alkaline anion‐exchange fuel‐cell membranes

Mechanical responses in the length direction and thickness direction of quaternary 1,4‐diazabicyclo‐[2.2.2]‐octane polysulfone alkaline anion‐exchange fuel‐cell membranes

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

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

Contact Info

Product

Resources

About