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Three-dimensional computational characterization of grain size and texture effects in magnesium alloys

Journal of Magnesium and Alloys 2023年第10期11卷 3657-3672页

作者： Shahmeer Baweja Shailendra P.Joshi Department of Mechanical Engineering University of HoustonHoustonTX 77204-4006USA

This work systematically investigates the microstructure-property relationship in Mg alloys. Emphasis is placed on understanding, through high resolution crystal plasticity modeling, how grain size and texture collectively impact material strengthening and hardening, net plastic anisotropy, and tension-compression asymmetry. To achieve this, 528 fully three-dimensional finite element calculations are performed, which comprise eleven textures, four grain sizes, six loading orientations, and two uniaxial loading states(tension and compression). The grain size effect follows Hall-Petch relation that depends on both, loading orientation and initial texture. The reduction in extension twinning with grain size refinement is influenced by texture as well. Below a threshold textural strength, grain size refinement leads to an appreciable reduction in the net plastic anisotropy at yield, quantified using Hill anisotropy, and reduced tension-compression asymmetry. Using a micromechanical basis, the effect of grain size and texture on material ductility is predicted to be non-monotonic. The computational predictions serve as synthetic data sets for experimental validation and reduced-order modeling.

关键词： Mg alloys Microstructure-property relations grain-size effect Crystal plasticity Damage micromechanics

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Mechanical properties of nanocrystalline nanoporous gold complicated by variation of grain and ligament: A molecular dynamics simulation

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Science China(Technological Sciences) 2018年第9期61卷 1353-1363页

作者： LI JieJie XIAN YueHui ZHOU HongJian WU RunNi HU GuoMing XIA Re Key Laboratory of Hydraulic Machinery Transients Ministry of Education Wuhan University Hubei Key Laboratory of Waterjet Theory and New Technology Wuhan University

A series of large-scale molecular dynamics(MD) simulations has been performed to study the effects of grain size and ligament diameter on the mechanical properties of nanocrystalline nanoporous gold. Such simulations indicate that the principal deformation mechanism is a combination of grain boundary sliding, grain rotation and dislocation movement. The results of uniaxial tensile tests reveal the presence of a reverse Hall-Petch relation between strength and nominal grain size, rather than the conventional Hall-Petch relationship in the present range of nominal grain size(7.9–52.7 nm). An increase of flow stress may possibly attribute to the lower total proportion of grain boundary sliding and grain rotation in the deformation of samples with larger grain size. The Young's modulus shows a linear relation with the reciprocal of nominal grain size, which depends largely on the volume fraction of grain boundaries and thus decreasing grain size leads to relatively lower Young's modulus. MD simulations on samples with ligament diameter ranging from 4.07 to 8.10 nm are also carried out and results show that the increasing ligament diameter resulted in decreased flow stress and increased Young's modulus.

关键词： nanocrystalline nanoporous gold grain-size effect ligament-size effect mechanical properties molecular dynamics

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Research progresses of lead-free BaTiO3-Based piezoelectric ceramics

Research progresses of lead-free BaTiO3-Based piezoelectric ...

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2011年全国压电和声波理论及器件应用研讨会

作者： Jia-liang ZHANG~* School of Physics,State Key Laboratory of Crystal Materials,Shandong University,Jinan,P.R.China

Barium titanate(BaTiO) is historically the first ceramic piezoelectric material and shows the high possibility to be revitalized as a popular lead-free piezoelectric *** decades,BaTiO ceramics had been known to exhibi... 详细信息

关键词： BaTiO3 ceramics Piezoelectric properties grain-size effect Temperature stability

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