scholarly journals Martensitic Transformation and Metamagnetic Transition in Co-V-(Si, Al) Heusler Alloys

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 226
Author(s):  
Kousuke Nakamura ◽  
Atsushi Miyake ◽  
Xiao Xu ◽  
Toshihiro Omori ◽  
Masashi Tokunaga ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Spontaneous Magnetization ◽  
Heusler Alloys ◽  
Parent Phase ◽  
Entropy Change ◽  
Ferromagnetic State ◽  
Martensite Phase ◽  
Reverse Martensitic Transformation ◽  
Curie Temperatures

This study investigates the crystal structure, martensitic transformation behavior, magnetic properties, and magnetic-field-induced reverse martensitic transformation of Co64V15(Si21–xAlx) alloys. It was found that by increasing the Al composition, the microstructure changes from the martensite phase to the parent phase. The crystal structures of the martensite and parent phases were determined as D022 and L21, respectively. Thermoanalysis and thermomagnetization measurements were used to determine the martensitic transformation and Curie temperatures. Both the ferromagnetic state of the parent phase and that of the martensite phase were observed. With the increasing Al contents, the martensitic transformation temperatures decrease, whereas the Curie temperatures of both the martensite and parent phases increase. The spontaneous magnetization and its composition dependence were also determined. The magnetic-field-induced reverse martensitic transformation of a Co64V15Si7Al14 alloy under pulsed high magnetic fields was observed. Moreover, using the results of the DSC measurements and the pulsed high magnetization measurements, the temperature dependence of the transformation entropy change of the Co-V-Si-Al alloys was estimated.

Magnetic-field-induced reverse martensitic transformation and large magnetoresistance in Ni50−xCoxMn32Al18 Heusler alloys

2012 ◽  
Vol 100 (17) ◽  
pp. 172410 ◽  
Author(s):  
H. C. Xuan ◽  
L. J. Shen ◽  
T. Tang ◽  
Q. Q. Cao ◽  
D. H. Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Heusler Alloys ◽  
Reverse Martensitic Transformation

Effect of External Fields on the Martensitic Transformation in Ni-Mn Based Heusler Alloys

2008 ◽  
Vol 52 ◽  
pp. 189-197 ◽  
Author(s):  
Xavier Moya ◽  
Lluís Mañosa ◽  
Antoni Planes ◽  
Seda Aksoy ◽  
Mehmet Acet ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hydrostatic Pressure ◽  
Martensitic Transformation ◽  
Applied Magnetic Field ◽  
Heusler Alloys ◽  
Applied Pressure ◽  
Large Change ◽  
Entropy Change ◽  
Martensitic Transition ◽  
External Fields

In this paper, we discuss the possibility of inducing a martensitic transition by means of an applied magnetic field or hydrostatic pressure in Ni-Mn based Heusler shape memory alloys. We report on the shift of the martensitic transition temperatures with applied magnetic field and applied pressure and we show that it is possible to induce the structural transformation in a Ni50Mn34In16 alloy by means of both external fields due to: (i) the low value of the entropy change and (ii) the large change of magnetization and volume, which occur at the martensitic transition.

scholarly journals Magnetoresistance and Thermal Transformation Arrest in Pd2Mn1.4Sn0.6 Heusler Alloys

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2308 ◽  
Author(s):  
Xiao Xu ◽  
Hironari Okada ◽  
Yusuke Chieda ◽  
Naoki Aizawa ◽  
Daiki Takase ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Curie Temperature ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Thermal Transformation ◽  
Heusler Alloys ◽  
Parent Phase ◽  
Electric Resistivity ◽  
Transformation Temperatures

The magnetization, electric resistivity, and magnetoresistance properties of Pd 2 Mn 1 . 4 Sn 0 . 6 Heusler alloys were investigated. The Curie temperature of the parent phase, martensitic transformation temperatures, and magnetic field dependence of the martensitic transformation temperatures were determined. The magnetoresistance was investigated from 10 to 290 K, revealing both intrinsic and extrinsic magnetoresistance properties for this alloy. A maximum of about − 3 . 5 % of intrinsic magnetoresistance under 90 kOe and of about − 30 % of extrinsic magnetoresistance under 180 kOe were obtained. Moreover, the thermal transformation arrest phenomenon was confirmed in the Pd 2 Mn 1 . 4 Sn 0 . 6 alloy, and an abnormal heating-induced martensitic transformation (HIMT) behavior was observed.

Martensite-austenite and Ferromagnetic-paramagnetic Transformations in Ni2-xAxMn1-yByGa1-zCz (A, B=Co; C=Al) Heusler Alloys

2009 ◽  
Vol 59 (12) ◽  
Author(s):  
Mihail-Liviu Craus ◽  
Viorel Dobrea ◽  
Mihai Lozovan
Keyword(s):  
Magnetic Field ◽  
Transition Temperature ◽  
Martensitic Transformation ◽  
Low Temperatures ◽  
Room Temperature ◽  
Heusler Alloys ◽  
Partial Substitution ◽  
Martensitic Transition ◽  
Cscl Type ◽  
Curie Temperatures

Ni2MnGa Heusler alloy is known as a potential smart material. At room temperature it has a L21 type structure, undergoing a martensitic transition (TM) at low temperatures. Some authors have classified Ni-Mn-Ga Heusler alloys on the values of martensitic transformation and Curie temperatures: first group formed by alloys with TM below room temperature and TC, second group with TM around room temperature and third group with TM]TC. The partial substitution of Ni with Mn leads to an increase of the transition temperature and a decrease of the Curie temperature. The Ni2-xMn1+xGa alloys have a complex tetragonal structure at room temperature. The substitution of Ga with Al can change the crystalline and magnetic structure of Heusler alloys: Ni2MnAl is antiferromagnetic for a B2 (CsCl type, with Mn and Al randomly distributed in the center of the cube) structure and ferromagnetic for a L21 (BiF3 type with Mn and Al ordered distributed in the cube center) structure. We intend to put in evidence a dependence between the applied magnetic field on a side, and the transition temperature, on other side, for the Ni2-xAxMn1-yByGa1-zCz (A, B=Co; C=Al) Heusler alloys.

Metamagnetic Shape Memory Effect and Magnetic Properties of Ni-Mn Based Heusler Alloys

2011 ◽  
Vol 684 ◽  
pp. 139-150 ◽  
Author(s):  
Ryosuke Kainuma ◽  
W. Ito ◽  
R.Y. Umetsu ◽  
V.V. Khovaylo ◽  
T. Kanomata
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Magnetic Properties ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Heusler Alloys ◽  
Parent Phase ◽  
Martensite Phase ◽  
Basic Information

In some Ni-Mn-In- and Ni-Mn-Sn-based Heusler-type alloys, martensitic transformation from the ferromagnetic parent phase to the paramagnetic martensite phase appears and magnetic field-induced reverse transformation, namely, metamagnetic phase transition, is detected. In this paper, the metamagnetic shape memory effect due to the metamagnetic phase transition and the magnetostress effect in the Ni-Co-Mn-In alloys are introduced and the phase diagrams of Ni50Mn50-yXy (X: In, Sn, Sb) alloys are shown as basic information. Furthermore, the magnetic properties of both the parent and martensite phases in the Ni-Mn-In- and Ni-Mn-Sn-based metamagnetic shape memory alloys are also reviewed.

Effect of martensitic transformation and magnetic field on transport properties of Ni-Mn-Ga and Ni-Fe-Ga Heusler alloys

2009 ◽  
Vol 80 (10) ◽  
Author(s):  
J. M. Barandiarán ◽  
V. A. Chernenko ◽  
P. Lázpita ◽  
J. Gutiérrez ◽  
J. Feuchtwanger
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Transport Properties ◽  
Heusler Alloys

Effect of L21 Ordering on the Martensitic and Intermartensitic Transformations in a Ni-Mn-Ga Shape Memory Alloy

2007 ◽  
Vol 130 ◽  
pp. 127-134
Author(s):  
Concepcio Seguí ◽  
Jaume Pons ◽  
Eduard Cesari
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Single Crystal ◽  
Shape Memory ◽  
Parent Phase ◽  
Heat Treatments ◽  
Free Energies ◽  
Transformation Temperatures ◽  
Reverse Martensitic Transformation ◽  
Order Degree

The present work analyses the influence of austenite ordering on a single crystal Ni-Mn- Ga alloy which displays, on cooling, a sequence of martensitic (MT) and intermartensitic (IMT) transformations. The MT and IMT show distinct behaviour after ageing in austenite: while the MT temperatures are not affected by the performed heat treatments, the IMT shifts toward lower temperatures after quenching from increasing temperatures, progressive recovery occurring upon ageing in parent phase. Such evolution can be related to changes in the L21 order degree, in the sense that ordering favours the occurrence of the intermartensitic transformation, while it does not affect noticeably the forward and reverse martensitic transformation temperatures. The closeness of the free energies of the different martensite structures allows to explain this behaviour.

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