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"Enhanced magnetocaloric effect accompanying successive magnetic transi" by H. Y. Hao, W. Q. Wang et al.

The lack of magnetic refrigeration (MR) materials with high magnetocaloric effect (MCE) and large relative cooling power (RCP) in the temperature range required for hydrogen liquefaction (20 K–77 K) is a bottleneck for practical applications of MR cooling systems. The present investigation of TbMn2Si2-xGex compounds (x = 0.1, 0.2) by variable temperature neutron and synchrotron X-ray diffraction, magnetization and heat capacity measurements, establish that substitution of Si with Ge in TbMn2Si2 leads to a significant enlargement of the unit cell and modification of the magnetic properties. Two consecutive ferromagnetic first-order transitions occur below 77 K with the third transition from paramagnetism to a collinear antiferromagnetic state being determined around 500 K. The resultant plateau-like MCE with large RCP below 77 K in these designed compounds offers scope for application for hydrogen liquefaction. Detailed neutron investigation confirm that four magnetic states exist wit ....

Magnetic Phase Transition , Magnetoelastic Coupling , Neutron Diffraction ,

Asbury science students receive top scores for research presentations

Asbury science students receive top scores for research presentations
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United States , Kentucky River , Commonwealth Of Kentucky , Northern Kentucky University , Noahm Clark , Katherine Stanley , Rebekah Bogle , Amanda Fuller , Joanne Jung , Sara Brewer , Vins Sutlive , Ewing Wiley , Shaw School Of Sciences , Kentucky Academy Of Science , Shaw School Of Sciences Dean Dr , Asbury University , Shaw Collaborative Learning Center , Shaw School , Kentucky Academy , Meeting November , Northern Kentucky , Science Executive Director Amanda , Potential Mechanism , Mitochondrial Alterations , Neutron Diffraction , Molybdenum Carboxylate Catalytic Precursor ,

"In-situ heating observations on microstructure relaxation of ultrafine" by Megumi Kawasaki, Jae Kyung Han et al.

The thermal stability of ultrafine-grained metals can be fully understood when observing time-resolved microstructural changes over multiple-length scales. The global microstructural relaxation behavior upon heating of an ultrafine-grained (UFG) CoCrFeNi high-entropy alloy (HEA) was characterized by in-situ heating neutron diffraction measurements. Before heating, the nanocrystalline microstructure was introduced by applying high-pressure torsion (HPT), leading to severe lattice distortion by excess dislocations and defects. The sequential information on the structural relaxation of recovery, recrystallization, and grain growth are identified by in-situ heating neutron diffraction analysis defining the texture development, linear thermal lattice expansion, and stress relaxation behaviors of the UFG HEA with increasing temperature up to 1300K. By contrast, nanocrystalline metals processed by HPT are often inhomogeneous microstructurally and compositionally. The influence of such inhomog ....

High Pressure Torsion , Laser Scanning Confocal Microscopy , Neutron Diffraction , X Ray Diffraction ,

"Synchrotron High-Energy X-ray & Neutron Diffraction, and Laser-Scannin" by Megumi Kawasaki, Jae Kyung Han et al.

This report is aimed at giving an overview of the significance of the novel and innovative microstructural and microscopic characterization techniques for bulk nanostructured metals processed by severe plastic deformation, specifically high-pressure torsion (HPT). In practice, the microstructural relaxation behavior upon heating of nanostructured 316L stainless steel and CoCrFeNi high-entropy alloy was characterized by in-situ heating neutron diffraction measurements; the heterogeneous phase distribution of an HPT-bonded hetero-nanostructured AlMg alloy was examined using synchrotron high-energy X-ray diffraction; and the microstructural evolution upon heating of a nanostructured CoCrFeNiMn high-entropy alloy was examined by laser-scanning confocal microscopy. These novel techniques are complementary to each other and any other in- or ex-situ testing methods, especially when nanocrystalline metals are transforming microstructurally and compositionally with temperature and time in a hie ....

High Pressure Torsion , Laser Scanning Confocal Microscopy , Anocrystalline Metals , Neutron Diffraction , Ynchrotron High Energyx Rays ,

"Application of powder arc additive manufacturing process in in-situ fa" by Bosheng Dong

The major objective of this thesis was to explore an intelligent manufacturing method which is capable to fabricate high entropy alloys (HEAs) efficiently, and then to design new types of HEAs for use within a nuclear reactor environment. The microstructures, phase characterization and mechanical properties of alloys were investigated.
Powder arc additive manufacturing (PAAM) having a high level of controlling local forming procedure was established to fabricate HEAs in-situ. This new manufacturing process possesses time and cost saving, and rapid cooling rate which can reduce the segregation of material in comparison to traditional methods. AlCoCrFeNi2.1 eutectic HEA which simultaneously possesses high strength and high ductility was used as a prime example to verify the feasibility of PAAM system. Different times (1,3,6) remelting process which is typically applied in arc melting to improve the homogeneity of prepared material was compared in this research. The applied layer-remel ....

High Entropy Alloys , Additive Manufacturing , Row Activation , Neutron Diffraction , Mechanical Properties ,