Sensitivity of the residual topography to single crystal plasticity parameters in Berkovich nanoindentation on FCC nickel

Renner, Emile; Gaillard, Yves; Richard, F.; Amiot, Fabien; Delobelle, P.

doi:10.1016/j.ijplas.2015.10.002

Cited by 80 publications

(34 citation statements)

References 68 publications

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“…The pile-up patterns depend on the grain orientation: Multiple triangles in the f111g grain, butterfly shapes in the f101g grain and the cross shape in f001g grain were also observed during previous studies [21,26,28,[44][45][46][47]. Wang et al [28] reported that the pile-up pattern on a 111 f g surface has a sixfold symmetry (threefold rotational symmetry and twofold mirror symmetry, which is the same as an equilateral triangle).…”

Section: Discussionmentioning

confidence: 63%

Insight into indentation-induced plastic flow in austenitic stainless steel

2020

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The indentation-induced plasticity and roughness have been investigated intensively by experiments and simulations during the last decades. However, the precise mechanisms of how dislocation flow leads to pileup formation are still not completely understood, although this is one of the initial steps causing surface roughening in tribological contacts at low loads. In this work, f001g-, f101gand f111g-grain orientations in an austenite stainless steel [(face-centered cubic (FCC) phase]) are indented with varying load forces. By using scanning electron-based methods and slip plane analysis, we reveal: (1) how slip-steps show the change of pileup formation, (2) how the slip-plane inclination determines the dislocation flow and (3) how slip-plane interactions result in the final pileup shape during indentation. We find that the flow direction transforms from the forward flow to the sideway at a transition angle of 55 À58 between the slip-plane and the surface. We use large displacement finite element method simulations to validate an inversion of the resolved shear stress at this transition angle. We provide insights into the evolution of plasticity in dislocation-mediated FCC metal indentations, with the potential application of this information for indentation simulations and for understanding the initial stage of scratching during tribology in the future.

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Section: Discussionmentioning

confidence: 63%

Insight into indentation-induced plastic flow in austenitic stainless steel

2020

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“…So, the plastic zone around the imprints in the CG Cu cannot be confined by the GB structure in the UFG Cu and the pile-up lateral extension thus declines to som extent (as shown in Figure 8c). Additionally, Renner claimed that the pile-up sizes and distributions such as height and lateral extension depend on the crystallographic directions and indenter disorientation, which are also the main reasons for generating significant asymmetries around imprints in CG metals [11].…”

Section: Discussionmentioning

confidence: 99%

“…Taking the pile-ups of the residual impression into account, the projected area should be calibrated in order to yield relatively accurate values of E and H. A method exploiting the topography measurements to correct the values of these two mechanical parameters was proposed by Renner as the following procedures [11]:…”

Section: Correction To the Hardness And Modulus From Pile-up Measuremmentioning

confidence: 99%

“…It has been suggested that for materials with low work hardening ability, the amount of pile-up would become obvious as the ratio of h f /h max becomes larger than 0.7 [2,3]. Interestingly, most of the theoretical development reports were based on numerical modeling [5,[8][9][10][11][12], with very limited experimental data being used to explain this phenomenon. As for crystalline materials, it has been widely accepted that the grain boundary (GB) mediated deformation process can operate effectively in materials with a grain size smaller than 500 nm.…”

Section: Introductionmentioning

confidence: 99%

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Nanoindentation-Induced Pile-Up in the Residual Impression of Crystalline Cu with Different Grain Size

Zhang

Sun

et al. 2017

Crystals

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Nanoindentation morphologies of crystalline copper have been probed at the grain scale. Experimental tests have been conducted on nanocrystalline (NC), ultrafine-grained (UFG), and coarse-grained (CG) copper samples with a new Berkvoich indenter at the strain rate of 0.04/s without holding time at an indentation depth of 2000 nm at room temperature. As the grain size increases, the height of the pile-up around the residual indentation increases and then exhibits a slightly decrease in the CG Cu. The maximum of the pile-up in the CG Cu obviously deviates from the center of the indenter sides. Our analysis has revealed that the dislocation motion and GB activities in the NC Cu, some cross-and multiple-slip dislocations inside the larger grain in the UFG Cu, and forest dislocations from the intragranular Frank-Read sources in the CG Cu would directly induce this distinct pile-up effect.

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“…The nanoindentation method has a very small measurement area. Therefore, it is expected to be able to measure the effect of the crystal orientation or microdefects of specimens on the mechanical properties of a material [3][4][5][6][7]. In this report, in order to investigate the effect of the crystal orientation, the hardness and the reduced modulus of the single crystal of sapphire were measured by changing the direction angle of Berkovich indenter.…”

Section: Introductionmentioning

confidence: 99%

Orientation Dependence of Hardness and Reduced Modulus of Single Crystal Sapphire Surface Measured by Nanoindentation

Okawa¹,

Clark²,

Tashiro³

et al. 2019

IJMSA

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Nowadays, industrial products are downsized, and the structure of materials is controlled with the nanometer precision, and it becomes very important to measure the mechanical properties of local area of bulk material. Especially the hardness and the elastic modulus are important mechanical properties. The orientation dependence of hardness and reduced modulus of single crystal sapphire surface was investigated by nanoindentation. The conventional technique to measure the hardness of materials using an optical micrometer cannot evaluate mechanical properties of a local region of several µm or less. However, nanoindentation can measure mechanical properties of very small surface area of materials, and is expected to detect the micro structure dependence of mechanical properties. Nanoindentation uses very small indenter made of diamond, and measures the indentation depth. The measured depth is converted to the indented area size using the area function. The area function of the indenter can be obtained using a standard material (fused quartz) in advance. Therefore nanoindentation can measure the indented area size without using an optical micrometer. In this report, it was shown that the nanoindentation could detect the structure dependence of mechanical properties of materials. The specimen was a single crystal sapphire with c -axis surface, and the indenter was Berkovich type diamond tip. It was confirmed that the nanoindentation hardness was the lowest, and the reduced modulus was the largest, when the ridge line of indenter was oriented to the m -axis of single crystal. The nanoindentation could detect the structure dependence of a local area of mechanical properties materials.

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Sensitivity of the residual topography to single crystal plasticity parameters in Berkovich nanoindentation on FCC nickel

Cited by 80 publications

References 68 publications

Insight into indentation-induced plastic flow in austenitic stainless steel

Insight into indentation-induced plastic flow in austenitic stainless steel

Nanoindentation-Induced Pile-Up in the Residual Impression of Crystalline Cu with Different Grain Size

Orientation Dependence of Hardness and Reduced Modulus of Single Crystal Sapphire Surface Measured by Nanoindentation

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