Links among the Fukui potential, the alchemical hardness and the local hardness of an atom in a molecule

2021 ◽  
Author(s):  
Tatiana Gómez ◽  
Patricio Fuentealba ◽  
Andrés Robles‐Navarro ◽  
Carlos Cárdenas
Keyword(s):  
Local Hardness

scholarly journals Control of Local Hardness Gradient of Metal Surface by Inclined Surface Treatment Using Ultrasonic Nanocrystal Surface Modification

2021 ◽  
Vol 8 (2) ◽  
pp. 533-546
Author(s):  
Yeong-Kwan Jo ◽  
Yeong-Wook Gil ◽  
Do-Sik Shim ◽  
Young-Sik Pyun ◽  
Sang-Hu Park
Keyword(s):  
Surface Modification ◽  
Surface Treatment ◽  
Metal Surface ◽  
Incident Angle ◽  
Surface Hardness ◽  
Parameter Study ◽  
Local Hardness ◽  
Practical Usefulness ◽  
Inclined Surface ◽  
Hardness Gradient

AbstractWe propose an effective method to control the local hardness and morphology of a metal surface by tilting the incident angle of a horn during ultrasonic nanocrystal surface modification (UNSM). In this study, surface treatment using UNSM was performed on an S45C specimen and a parameter study was conducted for optimization. The process parameters were the feeding rate, static load, striking force, and processing angle (Ф). In particular, the Ф was analyzed by tilting the horn by 0°, 10°, 20°, 30°, 40°, and 45° to understand its effect on surface hardness and changes in the morphology. From fundamental experiments, some important phenomena were observed, such as grain-microstructure changes along the processing and thickness directions. Furthermore, to verify the practical usefulness of this study, a flat and a hemispherical specimen of S45C material were treated using UNSM with various values of Ф. A significant change in hardness (an increase from 2–45%) and a gradual hardness gradient on the tested specimens could be easily realized by the proposed method. Therefore, we believe that the method is effective for controlling the mechanical hardness of a metal surface.

Local chemical potential, local hardness, and dual descriptors in temperature dependent chemical reactivity theory

2017 ◽  
Vol 19 (21) ◽  
pp. 13687-13695 ◽  
Author(s):  
Marco Franco-Pérez ◽  
Paul W. Ayers ◽  
José L. Gázquez ◽  
Alberto Vela
Keyword(s):  
Chemical Potential ◽  
Chemical Reactivity ◽  
Potential Well ◽  
Temperature Dependent ◽  
Local Hardness ◽  
Chemical Reactivity Theory ◽  
Definition Of

From the definition of a local chemical potential, well-behaved expressions for the local hardness and the dual descriptors are derived.

The Effect of Graded Structure of Sintered Iron-Manganese Biomaterials on the Range and Distribution of Local Hardness Values

2015 ◽  
Vol 662 ◽  
pp. 155-158
Author(s):  
Miriam Kupková ◽  
Monika Hrubovčáková ◽  
Martin Kupka ◽  
Adam Zeleňák
Keyword(s):  
Volume Fraction ◽  
Considerable Variability ◽  
Sintered Iron ◽  
Large Volume Fraction ◽  
Graded Structure ◽  
Local Hardness ◽  
Local Properties ◽  
Mn Content ◽  
Iron Manganese ◽  
Hardness Values

Powders comprised of Fe particles and 25, 30, 35wt.% of Mn particles were mixed, compacted and sintered to investigate the effect of Mn on the properties of sintered Fe-Mn alloys. It was found that the sample’s swelling, microstructure and distribution of local hardness values were strongly affected by the Mn content. The particles in Fe-25Mn and Fe-30Mn samples exhibited a distinct onion-like structure causing a considerable variability in local properties, while the particles in Fe-35Mn samples were at a glance more homogeneous, with a large volume fraction occupied by a nearly uniform material with almost constant properties.

Local hardness equalization and the principle of maximum hardness

2013 ◽  
Vol 138 (21) ◽  
pp. 214103 ◽  
Author(s):  
José L. Gázquez ◽  
Alberto Vela ◽  
Pratim K. Chattaraj
Keyword(s):  
Maximum Hardness ◽  
Local Hardness ◽  
Principle Of Maximum

Local hardness and density variation in glass substrates machined with Spark Assisted Chemical Engraving (SACE)

2009 ◽  
Vol 63 (1) ◽  
pp. 51-53 ◽  
Author(s):  
Tohid Fatanat Didar ◽  
Ali Dolatabadi ◽  
Rolf Wüthrich
Keyword(s):  
Density Variation ◽  
Glass Substrates ◽  
Local Hardness

scholarly journals Local Hardness Variation of Ti50Cu32Ni15Sn3 Processed by Laser Beam Melting (LBM)

2015 ◽  
Vol 3 (1) ◽  
pp. 34 ◽  
Author(s):  
Michael Cornelius Hermann Karg ◽  
Bhrigu Ahuja ◽  
Oliver Hentschel ◽  
Michael Schmidt
Keyword(s):  
Laser Beam ◽  
Hardness Variation ◽  
Local Hardness ◽  
Laser Beam Melting
Sign in / Sign up

Export Citation Format

Share Document