Analysis of activated slip systems in fatigue nickel polycrystals using the EBSD-technique in the scanning electron microscope

Blochwítz, C.; Brechbühl, J.; Tirschler, W.

doi:10.1016/0921-5093(95)10076-8

Cited by 70 publications

(34 citation statements)

References 5 publications

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“…Observations of fatigued copper single crystals allow to understand the formation of intrusion-extrusion steps at the free surface, also called Persistent Slip Markings (PSMs), which leads to the initiation of a surface microcrack [4]. Blochwitz et al [5] measured PSM appearing at the surface of a nickel polycrystal under cyclic loading. Further observations about fatigue induced surface relief were carried out by Man et al on 316L Stainless Steel using Atomic Force Microscope [6].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations of the free surface effect in three-dimensional polycrystalline aggregates

Guilhem

Basseville

Curtit³

et al. 2013

Computational Materials Science

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The aim of the present paper is to investigate the consequences of the loading on the free surface response in polycrystalline aggregates. The study is made on a 316L stainless steel. Finite element computations using a crystal plasticity model are performed to simulate a polycrystalline aggregate submitted to different cyclic loadings. A statistical analysis of the results is carried out to extract information concerning the local stress and local strain fields at the free surface. The analysis of plastic strain localization on surface maps and inside the bulk through transparent volumetric views allows to exhibit the effects of the grain orientation and of the loading on local mechanical fields. The computation of an indicator characterizing extrusion/intrusion steps give some information on the initiation sites.

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Section: Introductionmentioning

confidence: 99%

Numerical investigations of the free surface effect in three-dimensional polycrystalline aggregates

Guilhem

Basseville

Curtit³

et al. 2013

Computational Materials Science

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“…Concerning crack nucleation, observations showed the influence of grain orientation and plastic slip mechanisms Mineur 2000;Blochwitz et al 1996;Man et al 2002;Winter et al 1981). Applied stresses during highcycle or giga-cycle tests are small, which is why volume element behavior is generally supposed to be elastic.…”

Section: Introductionmentioning

confidence: 97%

“…Using the surface slip traces observed on polished tested specimen, authors tried to deduce the Schmid factors corresponding to the activated slip planes. Electron Back Scattered Diffraction permitted them to measure crystallographic orientations and to deduce Schmid factors with a better knowledge of activated slip systems (Mineur 2000;Blochwitz et al 1996;Man et al 2002). Following the EBSD study of Mineur (2000), cracks nucleate generally in grains with high Schmid factors.…”

Section: Introductionmentioning

confidence: 99%

Polycrystalline microstructure, cubic elasticity, and nucleation of high-cycle fatigue cracks

Sauzay

Jourdan

2006

Int J Fract

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It is well-known that high-cycle fatigue cracks usually nucleate in surface well-oriented grains with a high Schmid factor. A numerical evaluation of the effect of crystalline elasticity anisotropy (which is often neglected) on the stress state in well-oriented grains is presented. Each of these grains is located at the free surface of an aggregate. The other crystallographic orientations are random. Numerous finite element computations are carried out for evaluating the effect of the neighboring grain orientations. Resolved shear stress and normal stress averages are given, as well as scatter parameters and histograms. Several metals, orientations, and loading conditions are considered. For common (anisotropic) metals/alloys such as copper and austenitic steels, the local average resolved shear stress is about 18% smaller than the macroscopic value which induces a Schmid factor value with respect to the macroscopic tensile stress of 0.41 instead of the classical 0.5 value. Relative scatters in resolved shear stress and corresponding normal stress are high (respectively ±22% and ±38%). These high scatter values computed for small applied loads can explain many observations taken from the literature showing a large scatter in the plastic slip line feature, dislocation microstructure, microstructurally short M. Sauzay (B) · T. Jourdan DEN-DMN-SRMA, CEA, bât. 455, crack nucleation, and propagation rate among welloriented surface grains. Finally, the effects of some geometrical parameters are evaluated (2D/3D effects, subsurface grains….).

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“…In the recent years, the EBSD-based analysis concerns the understanding of local damage in polycrystalline materials induced by several types of mechanical degradation, however mainly dealing with a fatigue damage (e.g. El Bartali et al, 2008;Blochwitz et al, 1996). As so far only a little attention has been paid in this field to the cavitation analysis (e.g.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Aluminum Content on the Microstructure and Cavitation Wear of Feal Intermetallic Alloys

Jasionowski

Zasada

Polkowski

2014

Acta Mechanica Et Automatica

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Abstract:Intermetallic-based alloys (so called intermetallics) of the Fe-Al binary system are modern construction materials, which in recent decades have found application in many branches of the power, chemical and automotive industries. High resistance of FeAl based alloys to cavitational erosion results first of all from their high hardness in the as-cast state, large compressive stresses in the material, as well as homogeneous structure. In the present paper, the effect of aluminum content on the microstructure, texture and strain implemented upon cavitation wear of FeAl intermetallic alloys, have been analyzed by field emission gun scanning electron microscopy (FEG SEM) and electron backscatter diffraction (EBSD) analysis. Obtained results of structural characterization indicates that with increasing aluminium content effects of orientation randomization (weakening of <100>//ND casting texture), grain refinement and rising of mechanical strenght (and so cavitational resistance) take place.

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Analysis of activated slip systems in fatigue nickel polycrystals using the EBSD-technique in the scanning electron microscope

Cited by 70 publications

References 5 publications

Numerical investigations of the free surface effect in three-dimensional polycrystalline aggregates

Numerical investigations of the free surface effect in three-dimensional polycrystalline aggregates

Polycrystalline microstructure, cubic elasticity, and nucleation of high-cycle fatigue cracks

The Effect of Aluminum Content on the Microstructure and Cavitation Wear of Feal Intermetallic Alloys

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