Indentation Schmid factor and orientation dependence of nanoindentation pop-in behavior of NiAl single crystals

Li, Tianlei; Gao, Yanfei; Bei, Hongbin; George, E.P.

doi:10.1016/j.jmps.2011.04.003

Cited by 113 publications

(67 citation statements)

References 48 publications

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“…Li et al [24] defined an elastic indentation Schmid factor (ISF), S, which is the ratio of the maximum resolved shear stress on a given slip system (RSS e ) to the maximum contact pressure for Hertzian contact:…”

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confidence: 99%

Distinguishing between slip and twinning events during nanoindentation of magnesium alloy AZ31

2016

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mentioning

confidence: 99%

Distinguishing between slip and twinning events during nanoindentation of magnesium alloy AZ31

2016

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“…Nevertheless, estimation of SFs provides insights into the slip mechanism under the indenter. Recently, some authors have tried to define a Schmid factor for indentation in a better way [35]. However, in the present case it is seen that {110}<001> could be the favored slip system since SF calculations for slip along all possible slip plane-direction combinations of {110}<001> reinstate the hardness trends seen.…”

Section: Methodsmentioning

confidence: 65%

Mechanical Anisotropy in Austenitic NiMnGa Alloy: Nanoindentation Studies

2017

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Abstract:Mechanical anisotropy in an austenitic ferromagnetic shape memory alloy (SMA), Ni 50 Mn 26.25 Ga 23.75 , is investigated along (010), 120 , 121 , 231 and (232) using nanoindentation. While (010) exhibits the highest reduced modulus, E r , and hardness, H, (232) shows the lowest amongst the grain orientations examined in this study. The significant elastic anisotropy measured is attributed to differences in planar packing density and number of in-plane Ni-Mn and Ni-Ga bonds, whereas the plastic anisotropy is due to the differences in the onset of slip, which is rationalized by recourse to Schmid factor calculations. This would help determine the grain orientations in austenitic NiMnGa which exhibit better mechanical properties for SMA applications such as improving vibration damping characteristics of the alloy.

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“…Examples include the homogeneous dislocation nucleation under indentation (thus leading to the pop-in behavior on the load-displacement curves) [1][2][3][4][5] and heterogeneous dislocation nucleation from sharp features in strained nano-electronics [6][7][8][9][10]. A dislocation is usually modeled either by the Volterra model [11][12][13], which treats the dislocation as a mathematical discontinuity, or by the Peierls-Nabarro model, which treats the dislocation core as a continuous slip field [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Studies of Homogeneous and Heterogeneous Dislocation Nucleation based on the Rice-Peierls Framework

Lee

Gao

2011

MRS Proc.

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The study of dislocation nucleation has gained increasing attentions recently primarily due to the advancement of small scale mechanical testing methods. Based on the classic Rice model of dislocation nucleation from a crack tip in which the dislocation core is modeled by a continuous slip field, a nonlinear finite element method can be formulated with the interplanar potential as the input, and the development of interplanar slip field can be solved from the resulting boundary value problems. The effects of geometric boundary conditions, loading patterns, etc. can be conveniently determined, as opposed to the time consuming molecular simulations. To validate the method, we compare the simulations results of homogeneous dislocation nucleation and heterogeneous dislocation nucleation from a two-dimensional crack tip to the literature results. As proposed by Rice and Beltz (J. Mech. Phys. Solids, 1994), the activation energy for dislocation nucleation from a three-dimensional crack tip depends on the finite thickness in the direction parallel to the crack tip, which has been successfully reproduced in the finite element simulation results reported here.

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Indentation Schmid factor and orientation dependence of nanoindentation pop-in behavior of NiAl single crystals

Cited by 113 publications

References 48 publications

Distinguishing between slip and twinning events during nanoindentation of magnesium alloy AZ31

Distinguishing between slip and twinning events during nanoindentation of magnesium alloy AZ31

Mechanical Anisotropy in Austenitic NiMnGa Alloy: Nanoindentation Studies

Finite Element Studies of Homogeneous and Heterogeneous Dislocation Nucleation based on the Rice-Peierls Framework

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