14 papers · ranked by Valyu relevance
Xin Li, Wang Gao, Qing Jiang
metals from the view of the electronic-structure level Authors: ['Xin Li' 'Wang Gao' 'Qing Jiang'] Abstract: The relationship between grain size and yield strength of metals follows the Hall-Petch relationship σ = σ0 + kd-0.5; however, the specific physical factors that affect the coefficients σ0 and k of this…
Jing Shi, Yachao Wang, Xiaoping Yang
In this study, a comprehensive investigation on nano-scale machining of polycrystalline copper structures is carried out by molecular dynamics (MD) simulation. Simulation cases are constructed to study the impacts of grain size, as well as various machining parameters. Six polycrystalline copper structures are…
Pankaj Kumar, Saurabh Kabra, Jacqueline M. Cole
The emerging field of material-based data science requires information-rich databases to generate useful results which are currently sparse in the stress engineering domain. To this end, this study uses the’materials-aware’ text-mining toolkit, ChemDataExtractor, to auto-generate databases of yield-strength and…
Jingqi Chen, Xianlei Hu, Xianghua Liu
In order to study the size effect on the mechanical property of micro-scale metal, pure copper strips with thicknesses in the range of 20 µm to 600 µm were obtained through the asynchronous foil rolling technology. Progressive mechanical property tests indicated that the pure copper experiences softening effect at a…
Jan Eike Schnabel, Swantje Bargmann
In this article, we present a strategy to decouple the relative influences of colony, domain and lamella boundary strengthening in fully lamellar titanium aluminide alloys, using a physics-based crystal plasticity modeling strategy. While lamella and domain boundary strengthening can be isolated in experiments using…
Hiroaki Yokoyama, Hiroyuki Nagahama
In polycrystalline materials, an increase in the number of interfaces strengthens the material. For example, in deformation twins, deformation experiments have shown a correlation between the deformation-twin density and flow stress. However, this relationship is empirical, and its theoretical background is not yet…
Hubin Luo, Hongwei Sheng, Hongliang Zhang, Fengqing Wang + 4 more
'Jinkui Fan' 'Juan Du' 'J. Ping Liu' 'Izabela Szlufarska'] Dislocation activity is critical to ductility and the mechanical strength of metals. Dislocations are the primary drivers of plastic deformation, and their interactions with each other and with other microstructural features such as grain boundaries (GBs) lead…
Yongmin Li, A. J. Bushby, D. J. Dunstan
The experimental evidence for the Hall-Petch dependence of strength on the inverse square-root of grain size is reviewed critically. Both the classic data and more recent results are considered. While the data can be fitted to the inverse square-root dependence excellently (but using two free fitting parameters for…
Timo Mueller, Andrea Bachmaier, Ruth Konetschnik, T. Schoeberl + 1 more
'Reinhard Pıppan'] Amorphous/crystalline multilayer structures of Fe-P alloys were deposited electrochemically using the single bath technique. Hall-Petch behavior of microhardness with respect to sublayer thickness was observed down to a sublayer thickness of 15 nm. For thinner sublayers, a hardness plateau was…
Zuzanka Trojanová, Zdeněk Drozd, Kristýna Halmešová, Ján Džugan + 4 more
'Tomáš Škraban' 'Peter Minárik' 'Gergely Németh' 'Pavel Lukáč'] An extruded magnesium AZ31 magnesium alloy was processed by rotary swaging (RSW) and then deformed by tension and compression at room temperature. The work-hardening behaviour of 1-5 times swaged samples was analysed using Kocks-Mecking plots. Accumulation…
Alexander A. Reshetnyak
A theory of flow stress is proposed, including the yield strength σy of polycrystalline materials in the case of quasi-static plastic deformations depending on the average size d of a crystallite (grain) in the range of 10-8 –10-2 m. The dependence is based on a statistical model of energy spectrum distribution in each…
S. A. Firstov, T. R. Rogul, O. A. Shut
The generalized equation that describes the yield stress dependence upon the grain size in the wide range of grain sizes has been obtained. There are two critical grain sizes (dcr1, dcr2) that correspond to the changes in strengthening mechanism. The equation includes Hall - Petch relation in the range of d> dcr1. For…
Assa Auerbach
Exact formulas for the Hall coefficient [A. Auerbach, Phys. Rev. Lett. 121, 066601 (2018)], modified Nernst coefficient, and thermal Hall coefficient of metals are derived from the Kubo formula. These coefficients depend exclusively on equilibrium susceptibilities, which are significantly easier to compute than…
H. T. Yi, Y. N. Gartstein, V. Podzorov
Hall effect measurements are important for elucidating the fundamental charge transport mechanisms and intrinsic mobility in organic semiconductors. However, Hall effect studies frequently reveal an unconventional behavior that cannot be readily explained with the simple band-semiconductor Hall effect model. Here, we…