Development of a New Magnetic Stirring Facility and Efficient Method for Refinement of Solidified Grain Structure | Chapter 10 | Effect of Microgravity and Magnetic Steering on the Melt Flow and the Microstructure of Solidified Alloys

This work aimed to develop an efficient stirring facility and method with magnetic induction. Because the stirring by Rotation Magnetic Field (RMF) often produces strong macrosegregation, the Traveling Magnetic Field (TMF) was chosen for the stirring. The construction of this TMF twin-inductor is significantly different from the traditional magnetic stirrers, and it has a closed magnetic circuit. Three different magnetic fields can be produced with the developed twin-inductor to investigate the stirring effect. The inductor develops strong shearing stress at the flow perpendicular to the solidification front by flowing a part of metallic-melt layers touching each other in a direction opposite. The TMF twin inductor was combined with a solidification facility for the unidirectional solidification of different alloys.

 

The effect on the grain structure of the three different magnetic fields was compared using Al-7%Si-1% and Al-10%Si-0,2%Fe alloys. It has demonstrated that the most efficient mixing occurs when the magnetic fields in the two inductors move opposite each other.

Author(s) Details:

Arnold Rónaföldi,
HUN REN- University of Miskolc, Materials Science Research Group, Hungary and Institute of Physical Metallurgy, Metal Forming, and Nanotechnology, University of Miskolc, Hungary.

Zsolt Veres,
HUN REN- University of Miskolc, Materials Science Research Group, Hungary and Institute of Physical Metallurgy, Metal Forming, and Nanotechnology, University of Miskolc, Hungary.

Mária Svéda,
HUN REN- University of Miskolc, Materials Science Research Group, Hungary.

András Roósz,
HUN REN- University of Miskolc, Materials Science Research Group, Hungary and Institute of Physical Metallurgy, Metal Forming, and Nanotechnology, University of Miskolc, Hungary.

Please see the link here: https://stm.bookpi.org/EMMSMFMSA/article/view/13086

Copper Cold Gas-Dynamic Spray Processing for Highly Effective Antipathogenic Coatings: An Integrated Microstructural, Mechanics, and Materials Chemistry Perspective | Chapter 5 | Current Perspectives on Chemical Sciences Vol. 9

 The motivation for this endeavour is to gain a better understanding of microstructural characteristics, materials surface and bulk chemistry, as well as properties of cold sprayed traditional copper and nanostructured copper coatings in terms of antipathogenic contact killing and inactivation applications. During this work, the task of high strain rate induced severe plastic deformation states, microstructures, electrochemical behaviours, surface chemistry, and surface roughness for two copper cold spray material consolidations were characterised, which were developed from conventionally gas-atomized copper powder as well as a nano-agglomerated and spray-dried copper feedstock powder. Prior research has shown that the nanostructured Cu coating has a higher antipathogenic efficacy than the traditional Cu coating. As a result, microstructural analysis was carried out to determine discrepancies between the two coatings so that their respective pathogen killing and/or inactivation rates could be deduced and tested. Advanced laser-induced projectile impact testing, X-ray diffraction, scanning electron microscopy, electron backscatter diffraction, scanning transmission microscopy, nanoindentation testing, energy-dispersive X-ray spectroscopy, confocal microscopy, atomic force microscopy, linear polarisation, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, and copper ion rheology results.

Author (s) Details

Bryer C. Sousa
Materials Science and Engineering Program, Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA, 01609, USA.

Dr. Danielle L. Cote
Materials Science and Engineering Program, Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA, 01609, USA.

View Book :- https://stm.bookpi.org/CPCS-V9/issue/view/44