Author
Maoyuan Jiang
Bio: Maoyuan Jiang is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Dislocation & Materials science. The author has an hindex of 2, co-authored 3 publications receiving 37 citations.
Papers
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TL;DR: In this article, the effect of grain size and grain shape on the flow stress in model copper grains was investigated and a simple model was proposed to account for the grain shape influence on the grain size effect.
68 citations
TL;DR: In this article, 3D-DD simulations are performed with cubic grains ranging from 1 to 10µm to investigate the physical mechanisms at the origin of the Hall-Petch law.
22 citations
TL;DR: In this article , a multiscale modeling methodology involving discrete dislocation dynamics (DDD) and crystal plasticity finite element method (CPFEM) was used to study the grain size effect in FCC polycrystalline plasticity.
19 citations
TL;DR: In this paper, the authors used FDM solutions derived from Field Dislocations Mechanics (FDM) theory to calculate the stress components associated with the GND facets but are unable to account for the stress field variation induced by finite size effect.
Abstract: At low strain, geometrically necessary dislocations (GND) confined in the close vicinity of grain boundaries can be approximated as a dislocation wall structure called a GND facet Analytical solutions derived from Field Dislocations Mechanics (FDM) theory allow calculating the stress components associated with the GND facets but are unable to account for the stress field variation induced by finite size effect Dislocation dynamics simulation is used to investigate the true stress field of GND facets The geometry, dimension and dislocation density of three generic types of GND facets (twist, tilt and epitaxial facets) are systematically studied In all cases, the stress field generated by GND facets is proportional to the surface GND density and its spatial distribution can be recovered using FDM solution combined with two scaling parameters identified from DD simulation results This calculation procedure can be generalized to any crystal structure by relating the components of the surface Nye’s tensor to the solutions of simple cubic slip systems Finally, static and dynamic tests are made to validate the calculation of back stress within regular grains bounded by GND facets
11 citations
TL;DR: In this paper , single-phase SnTe bulks with dense dislocations were prepared by melting quenching combined with spark plasma sintering, and the resulting SnTe thermoelectric materials exhibited a large compressive strain of ∼7.5% at room temperature.
3 citations
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01 Oct 2004
TL;DR: In this paper, the Mechanism based Strain Gradient (MSG) plasticity is proposed to analyze the non-uniform deformation behavior in micro/nano scale.
Abstract: Recent experiments have shown the 'size effects' in micro/nano scale. But the classical plasticity theories can not predict these size dependent deformation behaviors because their constitutive models have no characteristic material length scale. The Mechanism - based Strain Gradient(MSG) plasticity is proposed to analyze the non-uniform deformation behavior in micro/nano scale. The MSG plasticity is a multi-scale analysis connecting macro-scale deformation of the Statistically Stored Dislocation(SSD) and Geometrically Necessary Dislocation(GND) to the meso-scale deformation using the strain gradient. In this research we present a study of nano-indentation by the MSG plasticity. Using W. D. Nix and H. Gao’s model, the analytic solution(including depth dependence of hardness) is obtained for the nano indentation , and furthermore it validated by the experiments.
295 citations
TL;DR: In this paper, the yield strength of the CrMnFeCoNi high-entropy alloy was determined in compression as a function of grain size and temperature, and the resulting Hall-Petch slopes were straight lines with different slopes that depend on the number of twin boundaries per grain.
152 citations
TL;DR: In this article, the authors present a concise and systematic review of the recrystallization in emerging materials with a view to reconcile its manifestations with trends established from recrylistization studies in traditional alloys.
86 citations
TL;DR: In this paper, an assessment criterion is proposed to quantitatively examine the representativeness of synthetic microstructure models in terms of the refined microstructural features including phase fraction, grain size, grain shape, and texture for each phase of the steel.
58 citations
TL;DR: In this article, the Hall-Petch relation for bimodal-grained Mg-Al-Zn alloys consisting of both ultra-fine grains (UFGs) and coarse grains (CGs) is discussed separately for yield stress and flow stress according to different deformation behaviors of UFGs/FGs and CGs.
53 citations