Buscar
Mostrando ítems 41-50 de 1558
Impurity-induced grain-boundary embrittlement: A simple three-dimensional model
(1990)
The impurity-induced grain-boundary decohesion is investigated on the basis of a three-dimensional-model calculation. The grain boundary is simulated by self-consistently modifying the hopping integrals between two neighboring ...
Inverse hall-petch relationship in nanocrystalline tantalum
(Elsevier Science SA, 2013-09-15)
Tantalum polycrystals (grain sizes varying from 2.5 to 30 nm) generated by Voronoi tessellation were subjected to tension and compression under uniaxial strain loading at strain rates on the order of 108–109 s−1 using ...
Thermal stability of ARMCO iron processed by ECAP
(Springer London Ltd, 2018-10)
The thermal stability of ARMCO iron processed by equal-channel angular pressing (ECAP) up to a true strain of 16 was investigated by differential scanning calorimetry (DSC). Particularly, the analysis was focused on deriving ...
Effect of grain size on the stress-temperature relationship in a β CuAlBe shape memory alloy
(Elsevier, 2011-01)
The grain size dependence of the DO3-18R martensitic transformation start temperature (Ms) and start stress (σs) was investigated in a Cu-22.66Al-2.98Be (at.%) alloy. Ms decreases and σs increases with the grain size ...
Ferroelectric state analysis in grain boundary of Na0.85Li0.15NbO3 ceramic
(American Institute of Physics (AIP), 2003-05-01)
The electric and dielectric properties of the grain boundary of Na0.85Li0.15NbO3 lead-free ferroelectric-semiconductor perovskite were investigated. The impedance spectroscopy was carried out as a function of a thermal ...
Grain boundary electric characterization of Zn7Sb2O12 semiconducting ceramic: A negative temperature coefficient thermistor
(American Institute of Physics (AIP), 2003-05-01)
The electrical properties of the grain boundary region of electroceramic sensor temperature based on inverse spinel Zn7Sb2O12 were investigated at high temperature. The zinc antimoniate was synthesized by a chemical route ...
Ferroelectric state analysis in grain boundary of Na0.85Li0.15NbO3 ceramic
(American Institute of Physics (AIP), 2003-05-01)
The electric and dielectric properties of the grain boundary of Na0.85Li0.15NbO3 lead-free ferroelectric-semiconductor perovskite were investigated. The impedance spectroscopy was carried out as a function of a thermal ...
Understanding the stability of Hollow nanoparticles with polycrystalline shellss
(American Chemical Society, 2020)
The existence of polycrystalline shells has been widely reported in the synthesis of hollow nanoparticles; however, the exact role displayed by the grain boundaries on the stability has been scarcely studied. By including ...