High-temperature properties and enhanced magnetic properties by magnetic field heat treatment of D022 Mn3−xGa (x = 0, 0.2, and 0.4) alloys

2021 ◽  
Vol 119 (2) ◽  
pp. 022403
Author(s):  
Dong Liang ◽  
Guang Tian ◽  
Chao Yun ◽  
Hui Zhao ◽  
Shunquan Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
High Temperature ◽  
High Temperature Properties

Enhancing hard magnetic properties in Fe69.5−Nd7B21Nb2.5Zr (x = 0–3) bulk magnets by magnetic field heat treatment

2020 ◽  
Vol 499 ◽  
pp. 166215 ◽  
Author(s):  
Yong Gu ◽  
Zhong Li ◽  
Chenxu Wang ◽  
Zhongyuan Wu ◽  
Xiaomeng Feng ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Hard Magnetic Properties

High Magnetic Field Annealing of Mn-Ga Intermetallic Alloys

MRS Advances ◽  
2015 ◽  
Vol 1 (3) ◽  
pp. 227-233 ◽  
Author(s):  
Daniel R. Brown ◽  
Ke Han ◽  
Theo Siegrist ◽  
Tiglet Besara ◽  
Rongmei Niu
Keyword(s):  
Magnetic Field ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Permanent Magnets ◽  
Intermetallic Alloys ◽  
Nanostructured Composite ◽  
Refined Microstructure ◽  
Field Annealing ◽  
High Magnetic Moment ◽  
Hard Magnetic Properties

AbstractMn-Ga alloys have shown promising hard magnetic properties, even though these alloys contain no rare-earth metals. However, much work is needed before Mn-Ga alloys become viable permanent magnets for applications. One of the challenges is to enhance the remanence. One technique to improve this property is applying a magnetic field during the heat treatment process. Magnetic annealing can promote phase transformation of the phases with high magnetic moment. This results in an increased remanence. Bulk samples of Mn-Ga alloys were made by mechanically alloying in order to create a nanostructured composite, followed by heat treatments in the presence of a 31 T magnetic field. The heat treatment temperatures were kept low in order to keep the refined microstructure. All the alloys exhibit hard magnetic properties at room temperature with large coercivity. This work reports findings of magnetic field annealed Mn-Ga bulk that exhibit high coercivities up to 19.4 kOe and increased remanence of 50% over the binary system, achieving values up to 6.9 emu/g. This is the highest coercivity reported in bulk Mn-Ga samples.

scholarly journals Magnetic field assisted melt–spinning Nd-Fe-B ribbons and anisotropic bonded NdFeB magnets prepared thereof

2016 ◽  
Vol 26 (1) ◽  
pp. 59
Author(s):  
Nguyen Xuan Truong ◽  
Nguyen Van Vuong
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
High Temperature ◽  
Melt Spinning ◽  
Milling Process ◽  
Mixed Powder ◽  
Energy Product ◽  
Hot Compaction ◽  
The Magnetic Field ◽  
Microstructure And Magnetic Properties

The magnetic-field-assisted melt-spinning (FAMS) Nd10.5Fe72Co11B6.5 ribbons were spun in an external magnetic field of 3 kG. The prepared ribbons were ball-milled in xylene solvent for 30 minutes followed by adding in and mixing with the high-temperature binder HTB-1 (3 wt%) for further 10 minutes. The mixed powder was dried and in-mold aligned in a magnetic field of 18 kOe and hot-compacted at 200 oC. The parameters of the FAMS ribbon preparation, ball-milling process, hot-compaction and anisotropic bonded magnets’ fabrication were optimized leading to the magnet’s energy product (BH)max of 10 MGOe. The microstructure and magnetic properties of prepared ribbons and bonded magnets will be discussed in details.

Transport Properties over Critical Currents for Ag-Sheathed Bi2Sr2CaCu2O8 Superconductors with Different E-J Dependence

2006 ◽  
Vol 47 ◽  
pp. 118-123 ◽  
Author(s):  
K. Watanabe ◽  
T. Inoue ◽  
Satoshi Awaji ◽  
Gen Nishijima ◽  
Ken Ichiro Takahashi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Treatment ◽  
High Temperature ◽  
Electric Field ◽  
Current Density ◽  
High Temperature Superconductors ◽  
Grain Morphology ◽  
Critical Currents ◽  
Heat Treated ◽  
The Magnetic Field

The current-carrying properties beyond a critical current determined by a voltage criterion for Ag-sheathed Bi2Sr2CaCu2O8 (Ag/Bi2212) superconductors are examined at 10 K and 20 K in magnetic fields. We prepared the in-field heat-treated Ag/Bi2212 wires, in order to obtain the magnetic field alignment microstructure for Ag/Bi2212. The electric field and current density (E-J) properties were evaluated for Ag/Bi2212 wires with and without the in-field heat-treatment. We found that the E-J properties for the in-field heat-treated Ag/Bi2212 wires differ from those for the out-of-field heat-treated ones, and are analogous to the E-J dependence for Bi-system high temperature superconductors with the sintered-like grain morphology.

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