Phase Transformation in Fe-Based Alloys in High Magnetic Fields

2005 ◽  
Vol 475-479 ◽  
pp. 301-304 ◽  
Author(s):  
X.J. Hao ◽  
H. Ohtsuka
Keyword(s):  
Magnetic Field ◽  
Phase Transformation ◽  
Martensitic Transformation ◽  
Magnetic Fields ◽  
Maraging Steel ◽  
High Magnetic Field ◽  
Transformation Temperature ◽  
High Magnetic Fields ◽  
Martensitic Transformation Temperature ◽  
Pearlitic Transformation

The effects of a high magnetic field on phase transformation behaviors and microstructures in Fe-based alloys have been extensively studied. It was found that a magnetic field accelerates ferritic and martensitic transformation, changes the morphology of the transformed microstructures and increases the A3 and A1 temperature. In a magnetic field of 10 Tesla, the A1 temperature increases by about 15°C for Fe-0.8C, the A3 temperature for pure Fe increases by about 8°C and the martensitic transformation temperature Ms in 18Ni maraging steel increases by 20°C. Ferrite grains are elongated and aligned along the direction of magnetic field in Fe-0.4C and Fe-0.6C alloys by ferritic transformation, but elongation was not found in pure Fe, Fe-0.05C alloy and Fe-1.5Mn-0.11C-0.1V alloy. Aligned structure was not found either by pearlitic transformation in Fe-0.8C alloy or by cementite precipitation from martensite.

Martensitic Transformation and Mechanical Properties of Fe-Doped Ni54Mn21Ga25 Alloys

2011 ◽  
Vol 687 ◽  
pp. 500-504
Author(s):  
S. X. Xue ◽  
S.S. Feng ◽  
P. Y. Cai ◽  
Q T Li ◽  
H. B. Wang
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
Magnetic Properties ◽  
Martensitic Transformation ◽  
Curie Temperature ◽  
Directional Solidification ◽  
Transformation Temperature ◽  
Room Temperature ◽  
Martensitic Transformation Temperature ◽  
Polycrystalline Alloys

Ni54Mn21-xFexGa25（x=0,1,3,5,7,9）polycrystalline alloys were prepared by the technique of directional solidification and the effect of substituting Fe for Mn on the martensitic transformation and mechanical properties of the alloys was analyzed. It was found that the Curie temperature increased with increasing substitution while the martensitic transformation temperature decreased. The Fe-doped Ni54Mn21Ga25 alloys exhibit excellent magnetic properties at room temperature; the typical Ni54Mn20Fe1Ga25 alloy shows a large magnetic-induced-strain of -1040 ppm at a magnetic field of 4000 Oe.

Large volume liquid state scalar Overhauser dynamic nuclear polarization at high magnetic field

2019 ◽  
Vol 21 (38) ◽  
pp. 21200-21204 ◽  
Author(s):  
Thierry Dubroca ◽  
Sungsool Wi ◽  
Johan van Tol ◽  
Lucio Frydman ◽  
Stephen Hill
Keyword(s):  
Magnetic Field ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
High Magnetic Field ◽  
Dynamic Nuclear Polarization ◽  
Large Volume ◽  
Liquid State ◽  
Nuclear Polarization ◽  
High Magnetic Fields

Dynamic Nuclear Polarization (DNP) can increase the sensitivity of Nuclear Magnetic Resonance (NMR), but it is challenging in the liquid state at high magnetic fields.

Magnetic field effect on the martensitic transformation temperature in Nb3Sn

Physica B+C ◽  
1985 ◽  
Vol 135 (1-3) ◽  
pp. 364-366 ◽  
Author(s):  
N. Toyota ◽  
T. Itoh ◽  
M. Kataoka ◽  
T. Fukase ◽  
H. Takei ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Transformation Temperature ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Martensitic Transformation Temperature

scholarly journals Tuning the structure and properties of a multiferroic metal–organic-framework via growing under high magnetic fields

RSC Advances ◽  
2018 ◽  
Vol 8 (25) ◽  
pp. 13675-13678 ◽  
Author(s):  
Lin Hu ◽  
Zhe Wang ◽  
Hui Wang ◽  
Zhe Qu ◽  
Qianwang Chen
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
High Magnetic Field ◽  
Metal Organic Framework ◽  
High Magnetic Fields ◽  
Structure And Properties ◽  
Metal Organic ◽  
Organic Framework

High magnetic field-induced synthesis has been demonstrated to tune the structure and properties of the multiferroic metal–organic framework [(CH3)2NH2][Mn(HCOO)3].

Effect of Ce Addition on Martensitic Transformation Behavior of TiNi Shape Memory Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 1973-1976 ◽  
Author(s):  
Ailian Liu ◽  
Xianglong Meng ◽  
Wei Cai ◽  
Lian Cheng Zhao
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Transformation ◽  
Martensitic Transformation ◽  
Shape Memory ◽  
Energy Dispersive Spectroscopy ◽  
Transformation Temperature ◽  
Martensitic Transformation Temperature ◽  
Transformation Behavior ◽  
Scanning Calorimetry ◽  
Ce Content

The effect of cerium addition on the martensitic transformation behavior and microstructure of Ti50-x/2Ni50-x/2Cex (x=0, 0.5, 2, 5 and 10at.%) alloys have been studied by differential scanning calorimetry (DSC) and energy dispersive spectroscopy (EDS). The results show that the addition of cerium affects the martensitic transformation temperature obviously. With the increase of Ce content, the phase transformation temperatures first increase rapidly and then decrease slightly, which may be attributed to the change of the Ni/Ti ratio in matrix. Moreover, the dispersed Ce-riched second particles with various morphologies are observed in TiNiCe alloys.

Control of the Alloying Element Distribution in Al-Alloys by High Magnetic Fields

2007 ◽  
Vol 539-543 ◽  
pp. 457-462 ◽  
Author(s):  
Qiang Wang ◽  
Xue Jun Pang ◽  
Chun Jiang Wang ◽  
Tie Liu ◽  
Dong Gang Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Physical Properties ◽  
High Magnetic Field ◽  
Element Distribution ◽  
Field Conditions ◽  
High Magnetic Fields ◽  
Gradient Magnetic Field ◽  
The Matrix ◽  
Al Mg Alloys

The distribution and solidified structure of alloying elements are important for the quality and the properties of alloys. In the present study, the solidification behavior of aluminum-rich alloys is studied under various high magnetic field conditions, and the influences of uniform and gradient magnetic fields with different intensity and direction on the distribution and the morphology of solute elements of Al-Cu and Al-Mg alloys are investigated. It is found that because of the differences of the electromagnetic force (Lorentz and magnetization forces) acting on Cu element and Mg element with different physical properties in the matrix, the regularities of distribution for Cu element and Mg element are opposite just in the intracrystalline and intergranular under high uniform magnetic field condition, and not only the content but the distributions of Cu and Mg elements are obviously different under high gradient magnetic field conditions as well. It can be concluded that high magnetic field has different effect on the solute distribution in alloys with different physical properties such as density, susceptibility, conductivity, etc. And the experimental results indicate that it is possible to control the terminal solubility and morphology of the solute elements in alloys by high magnetic fields.

scholarly journals Structure, phase transformation, and hardness of NiTiHfNd alloys

2021 ◽  
Vol 3 (5) ◽  
Author(s):  
Chunwang Zhao ◽  
Shilei Zhao
Keyword(s):  
Phase Transformation ◽  
Martensitic Transformation ◽  
Vickers Hardness ◽  
Transformation Temperature ◽  
Thermal Hysteresis ◽  
Martensitic Transformation Temperature ◽  
Arc Melting ◽  
Nd Addition ◽  
Structure Phase ◽  
First Time

AbstractNi50Ti29Hf21−xNdx (x = 0, 1, 2 at.%) and Ni50Ti29−xHf21Ndx (x = 1, 2 at.%) alloys were fabricated via arc melting. For the first time, the influence of Nd addition on structure, phase transformation, and hardness of NiTiHf alloy was investigated experimentally. It is found that the NiTiHfNd alloys consist of NiTiHf matrix and Nd-rich precipitates. Ni50Ti29Hf21 alloy demonstrates a martensitic transformation temperature as high as 314.1 °C, a thermal hysteresis as narrow as 37.7 °C, and a Vickers hardness as high as 500 HV. Nd addition obviously decreases the martensitic transformation temperature of NiTiHf alloys but still maintains a relatively narrow thermal hysteresis and a relatively high Vickers hardness compared with most other components of NiTiHf-based alloys.

Sign in / Sign up

Export Citation Format

Share Document