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.

scholarly journals Tunable Martensitic Transformation and Magnetic Properties of Sm-Doped NiMnSn Ferromagnetic Shape Memory Alloys

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1115
Author(s):  
Najam ul Hassan ◽  
Mohsan Jelani ◽  
Ishfaq Ahmad Shah ◽  
Khalil Ur Rehman ◽  
Abdul Qayyum Khan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Transformation Temperature ◽  
Room Temperature ◽  
Field Variation ◽  
Martensitic Transformation Temperature ◽  
Ferromagnetic Shape Memory Alloys ◽  
Ferromagnetic Shape Memory

NiMnSn ferromagnetic shape memory alloys exhibit martensitic transformation at low temperatures, restricting their applications. Therefore, this is a key factor in improving the martensitic transformation temperature, which is effectively carried out by proper element doping. In this research, we investigated the martensitic transformation and magnetic properties of Ni43Mn46-x SmxSn11 (x = 0, 1, 2, 3) alloys on the basis of structural and magnetic measurements. X-ray diffraction showed that the crystal structure transforms from the cubic L21 to the orthorhombic martensite and gamma (γ) phases. The reverse martensitic and martensitic transformations were indicated by exothermic and endothermic peaks in differential scanning calorimetry. The martensitic transformation temperature increased considerably with Sm doping and exceeded room temperature for Sm = 3 at. %. The Ni43Mn45SmSn11 alloy exhibited magnetostructural transformation, leading to a large magnetocaloric effect near room temperature. The existence of thermal hysteresis and the metamagnetic behavior of Ni43Mn45SmSn11 confirm the first-order magnetostructural transition. The magnetic entropy change reached 20 J·kg−1·K−1 at 266 K, and the refrigeration capacity reached ~162 J·Kg−1, for Ni43Mn45SmSn11 under a magnetic field variation of 0–5 T.

Magnetic Field-Induced Martensitic Transformation of Heusler-Type Ni2MnGa System

2007 ◽  
Vol 539-543 ◽  
pp. 3267-3272 ◽  
Author(s):  
Kazuko Inoue ◽  
Yasuo Yamaguchi ◽  
Yoshinobu Ishii ◽  
Hiroki Yamauchi ◽  
Toetsu Shishido
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Neutron Diffraction ◽  
Transformation Temperature ◽  
Field Effect ◽  
Room Temperature ◽  
Magnetic Field Effect ◽  
Martensitic Transformation Temperature ◽  
The Magnetic Field ◽  
Stoichiometric Alloy

Magnetic field effect on a Heusler-type Ni2MnGa off-stoichiometric alloy having a martensitic transformation temperature around room temperature which is coincident with a Curie temperature has been investigated. The process of martensitic transformation of a single crystal was investigated by neutron diffraction under the magnetic field up to 8 [T]. It was found that the magnetic field, which is applied at a temperature near the transformation temperature, causes the martensitic transformation. The process of the transformation caused by the increase in magnetic field is quite similar to the process caused by the decrease in temperature.

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 Full Variation of Site Substitution in Ni-Mn-Ga by Ferromagnetic Transition Metals

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 850
Author(s):  
Vít Kopecký ◽  
Michal Rameš ◽  
Petr Veřtát ◽  
Ross H. Colman ◽  
Oleg Heczko
Keyword(s):  
Transition Temperature ◽  
Martensitic Transformation ◽  
Curie Temperature ◽  
Transformation Temperature ◽  
Bulk Material ◽  
Martensitic Transition ◽  
Ferromagnetic Transition ◽  
Transition Elements ◽  
Martensitic Transformation Temperature ◽  
Valence Electrons

Systematic doping by transition elements Fe, Co and Ni on each site of Ni2MnGa alloy reveal that in bulk material the increase in martensitic transformation temperature is usually accompanied by the decrease in ferromagnetic Curie temperature, and vice versa. The highest martensitic transformation temperature (571 K) was found for Ni50.0Mn25.4(Ga20.3Ni4.3) with the result of a reduction in Curie temperature by 55 K. The highest Curie point (444 K) was found in alloy (Ni44.9Co5.1)Mn25.1Ga24.9; however, the transition temperature was reduced to 77 K. The dependence of transition temperature is better scaled with the Ne/a parameter (number of non-bonding electrons per atom) compared to usual e/a (valence electrons per atom). Ne/a dependence predicts a disappearance of martensitic transformation in (Ni45.3Fe5.3)Mn23.8Ga25.6, in agreement with our experiment. Although Curie temperature usually slightly decreases while the martensitic transition increases, there is no significant correlation of Curie temperature with e/a or Ne/a parameters. The doping effect of the same element is different for each compositional site. The cascade substitution is discussed and related to the experimental data.

MARTENSITIC TRANSFORMATION AND MAGNETIC PROPERTIES OF Fe-Pd ALLOYS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 794-797
Author(s):  
T. GOTO ◽  
A. KASHIWAKURA ◽  
S. KOYAMA
Keyword(s):  
Magnetic Properties ◽  
Martensitic Transformation ◽  
Curie Temperature ◽  
Transformation Temperature ◽  
Composition Range ◽  
Internal Field ◽  
Temperature Curve ◽  
Mossbauer Spectrum ◽  
Broad Maximum ◽  
The Difference

The effects of martensitic transformation from fcc to fct structure on the magetic properties of Fe-Pd alloys are investigated by magnetization, magnetostriction and 57Fe Mössbauer effect measurements. In the composition range of 30–32.5 at .% Pd, in which the fcc-fct transformation occurs, the Curie temperature decreases sharply with decreasing Pd content and the magnetostriction vs. temperature curve has a broad maximum around the fcc-fct transformation temperature. The Mössbauer spectrum exhibits the difference between the internal field for fcc, and fct.

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.

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