The effects of magnetic field on directionally solidified Ge/GeAs eutectic

1999 ◽  
Author(s):  
Jin Cho ◽  
Douglas Holmes
Keyword(s):  
Magnetic Field ◽  
Directionally Solidified

Evolution of microstructure and microsegregation in Ni-Mn-Ga alloys directionally solidified under axial magnetic field

2018 ◽  
Vol 758 ◽  
pp. 54-61 ◽  
Author(s):  
Long Hou ◽  
Yanchao Dai ◽  
Yves Fautrelle ◽  
Zongbin Li ◽  
Zhongming Ren ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Axial Magnetic Field ◽  
Directionally Solidified ◽  
Evolution Of Microstructure

Microstructure and magnetic field induced strain of directionally solidified ferromagnetic shape memory CoNiAl alloys

2005 ◽  
Vol 53 (1) ◽  
pp. 29-33 ◽  
Author(s):  
Jian Liu ◽  
Hongxing Zheng ◽  
Yanlu Huang ◽  
Mingxu Xia ◽  
Jianguo Li
Keyword(s):  
Magnetic Field ◽  
Shape Memory ◽  
Directionally Solidified ◽  
Ferromagnetic Shape Memory

Effect of Mn Concentration on Magneto-mechnaical Properties in Directionally Solidified Ferromagnetic Shape Memory Ni-Mn-Ga Alloys

2016 ◽  
Vol 66 (4) ◽  
pp. 391
Author(s):  
R.K Singh ◽  
M. Manivel Raja ◽  
P. Ghosal ◽  
R.P. Mathur
Keyword(s):  
Magnetic Field ◽  
Crystal Structure ◽  
Mechanical Properties ◽  
Phase Transformation ◽  
Chemical Composition ◽  
Room Temperature ◽  
Martensite Phase ◽  
Directionally Solidified ◽  
Ferromagnetic Shape Memory ◽  
Mn Concentration

Heusler type alloys Ni50Mn25+xGa25-x  (x=2,3,4 and 5) based on near stoichiometric Ni2MnGa compositions were directionally solidified using modified Bridgman method. The alloys thus prepared were characterized for their chemical composition, crystal structure, microstructure, phase transformation, magnetic  and magneto-mechanical properties. The directionally solidified Ni50Mn30Ga20 alloy rod exhibited maximum magnetocrystalline value of 95 kJm-3 and lowest detwinning stresses for martensite phase of about 5MPa. The reversible room temperature magnetic field induced strain of 0.2% under external magnetic field of 0.6T and 0.05kN bias load was obtained for the directionally solidified Ni50Mn30Ga20 alloy.

Effect of a High Magnetic Field on the Microstructure of Directionally Solidified NiAl-Cr(Mo)-Si Near-Eutectic Alloy at Different Withdrawal Rates

2017 ◽  
Vol 898 ◽  
pp. 407-412 ◽  
Author(s):  
Huan Liu ◽  
Wei Dong Xuan ◽  
Xing Fu Ren ◽  
Bao Jun Wang ◽  
Jian Bo Yu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Eutectic Alloy ◽  
Magnetic Force ◽  
Volume Fraction ◽  
Withdrawal Rate ◽  
Directionally Solidified ◽  
Combined Action ◽  
Columnar To Equiaxed Transition ◽  
The Magnetic Field

The effect of a 6T high magnetic field on the microstructure of directionally solidified NiAl-Cr (Mo)-Si near-eutectic alloy was investigated at the withdrawal rates of 2, 10 and 50 μm/s. The results showed that the microstructure evolved from planar eutectic to primary NiAl dendrites + cellular eutectic and then to dendritic eutectic with the increasing withdrawal rate. When the magnetic field was imposed, the well-aligned eutectic lamellae were disturbed and transformed into a wavy one at 2 μm/s. When the withdrawal rate increased to 10 μm/s, the application of the magnetic field destroyed the primary NiAl dendrite array and caused the occurrence of columnar-to-equiaxed transition (CET) of the NiAl dendrites. The volume fraction of primary dendrites also decreased. In addition, the width of intercellular/interdendritic regions decreased in cellular/dendritic eutectic structures when directionally solidified under the magnetic field. The above results should be attributed to the combined action of the thermoelectric magnetic force and the thermoelectric magnetic convection.

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