scholarly journals The Ductility and Shape-Memory Properties of Ni–Mn–Ga–Cu Heusler Alloys

2021 ◽  
Author(s):  
Agnieszka Brzoza-Kos ◽  
Eduard Cesari ◽  
Maciej Jakub Szczerba
Keyword(s):  
Crystal Structure ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Heusler Alloys ◽  
Potential Candidate ◽  
Recoverable Strain ◽  
Cu Content ◽  
Memory Applications ◽  
Large Shape

AbstractThe effect of Cu addition on crystal structure, compressive properties and shape-memory effect of Ni50Mn25Ga25−xCux alloys was studied. With increasing Cu content, the type of crystal structure evolves following a sequence: L21 → 10M → 2M → 2M+γ. Addition of Cu significantly improves room temperature ductility. In polycrystalline Ni50Mn25Ga17Cu8 alloy, a full recoverable strain equal to 7 pct was achieved. High martensitic transformation temperature and large shape-memory effect makes this material potential candidate in high-temperature shape-memory applications.

Modulated monoclinic crystal structure and large shape memory effect in nickel-rich Ni53.5Mn26.0Ga20.5

2010 ◽  
Vol 63 (11) ◽  
pp. 1073-1076 ◽  
Author(s):  
M. Ramudu ◽  
A. Satish Kumar ◽  
V. Seshubai ◽  
K. Muraleedharan ◽  
K.S. Prasad ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Monoclinic Crystal ◽  
Monoclinic Crystal Structure ◽  
Large Shape

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

ChemInform ◽  
2012 ◽  
Vol 43 (12) ◽  
pp. no-no
Author(s):  
R. Kainuma ◽  
W. Ito ◽  
R. Y. Umetsu ◽  
V. V. Khovaylo ◽  
T. Kanomata
Keyword(s):  
Magnetic Properties ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Heusler Alloys

Ferromagnetic Shape Memory Heusler Alloys

2012 ◽  
Vol 189 ◽  
pp. 189-208 ◽  
Author(s):  
Vijay Srivastava ◽  
Kanwal Preet Bhatti
Keyword(s):  
Magnetic Properties ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Heusler Alloy ◽  
Heusler Alloys ◽  
Structural Similarity ◽  
Magnetic Shape Memory ◽  
Half Metallicity ◽  
Ferromagnetic Shape Memory

Although Heusler alloys have been known for more than a century, but since the last decade there has been a quantum jump in research in this area. Heusler alloys show remarkable properties, such as ferromagnetic shape memory effect, magnetocaloric effect, half metallicity, and most recently it has been shown that it can be used for direct conversion of heat into electricity. Heusler alloys Ni-Mn-Z (Z=Ga, Al, In, Sn, Sb), show a reversible martensitic transformation and unusual magnetic properties. Other classes of intermetallic Heusler alloy families that are half metallic (such as the half Heusler alloys Ni-Mn-Sb and the full Heusler alloy Co2MnGe) are attractive because of their high Curie temperature and structural similarity to binary semiconductors. Unlike Ni-Mn-Ga, Ni-Mn-In and Ni-Mn-Sn transform from ferromagnetic austenite to non-ferromagnetic martensite. As is consistent with the Clausius-Clapeyron equation, the martensitic phase transformation can be manipulated by a magnetic field, leading to possible applications of these materials enabling the magnetic shape memory effect, energy conversion and solid state refrigeration. In this paper, we summarize the salient features of Heusler alloys, like the structure, magnetic properties and potential application of this family of alloys in industry.

Sintering and Morphology of Porous Structure in NiTi Shape Memory Alloys for Biomedical Applications

2012 ◽  
Vol 570 ◽  
pp. 87-95 ◽  
Author(s):  
Irfan Haider Abidi ◽  
Fazal Ahmad Khalid
Keyword(s):  
Elastic Modulus ◽  
Shape Memory Alloys ◽  
Porous Structure ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Biomedical Implants ◽  
Recoverable Strain ◽  
Porous Niti ◽  
Niti Shape Memory Alloys

The combination of attractive properties of porous NiTi shape memory alloys like high recoverable strain due to superelasticity and shape memory effect, good corrosion resistance, improved biocompatibilty, low density and stiffness along with its porous structure similar to that of bone make them best materials for biomedical implants. In current study porous NiTi SMAs have been fabricated successfully by space holder technique via pressureless sintering using NaCl powder as a spacer. Various volume fractions of NaCl powders have been involved to study their effect on the pore characteristics as well as on mechanical properties of foam. Porous NiTi with average porosity in the range of 44.3%-63.5% have been fabricated having average pore size 419µm which were very appropriate for various biomedical implants. Porous NiTi SMAs exhibited superelasticity at room temperature and shape memory effect was also determined. Maximum recoverable strain of 6.79% was demonstrated by the porous NiTi alloy with 44.3% porosity and it was diminishing with increasing porosity. Compression strength and elastic modulus have shown a decreasing trend with increasing porosity content. Elastic modulus of porous NiTi extends from 1.38 to 5.42GPa depending upon the pore volume which was very much comparable to that of various kinds of bones.

Direct measurement of shape memory effect for Ni54Mn21Ga25, Ni50Mn41.2In8.8 Heusler alloys in high magnetic field

2019 ◽  
Vol 482 ◽  
pp. 317-322 ◽  
Author(s):  
Dmitry S. Kuchin ◽  
Elvina T. Dilmieva ◽  
Yurii S. Koshkid'ko ◽  
Alexander P. Kamantsev ◽  
Victor V. Koledov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Direct Measurement ◽  
High Magnetic Field ◽  
Heusler Alloys

Martensitic transformation and shape memory effect at high temperatures in off-stoichiometric Co2VSi Heusler alloys

2016 ◽  
Vol 676 ◽  
pp. 191-196 ◽  
Author(s):  
Hengxing Jiang ◽  
Xiao Xu ◽  
Toshihiro Omori ◽  
Makoto Nagasako ◽  
Jingjing Ruan ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
High Temperatures ◽  
Heusler Alloys

Cooling-induced shape memory effect and inverse temperature dependence of superelastic stress in Co2Cr(Ga,Si) ferromagnetic Heusler alloys

2013 ◽  
Vol 103 (16) ◽  
pp. 164104 ◽  
Author(s):  
Xiao Xu ◽  
Toshihiro Omori ◽  
Makoto Nagasako ◽  
Akinari Okubo ◽  
Rie Y. Umetsu ◽  
...  
Keyword(s):  
Shape Memory ◽  
Temperature Dependence ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Heusler Alloys ◽  
Inverse Temperature

Martensitic Transformation and Shape Memory Effect in Titanium-Gold Compound

2011 ◽  
Vol 172-174 ◽  
pp. 49-54 ◽  
Author(s):  
Charles Declairieux ◽  
Philippe Vermaut ◽  
Richard Portier ◽  
Patrick Ochin ◽  
Anne Denquin
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Niti Alloy ◽  
Transformation Strain ◽  
Gold Compound ◽  
Compression Tests ◽  
Recoverable Strain ◽  
Ternary Element

High temperature shape memory alloys offer numerous potential applications in industrial domains like aeronautics. Even if up to now, none of the studied alloys have found a place in airplane turbines, research in this field is still active. Starting from the well-known “room temperature” shape memory alloy NiTi, it has been demonstrated that the addition of a ternary element such as gold in substitution of nickel greatly enhances the temperatures of the martensitic transformation. In the binary TiAu compound, the martensite start temperature can attain 875 K with satisfying reversibility and cycling stability. From lattice parameters measurements, it has been shown that the maximum transformation strain can reach 10.75 % for Ti47Au53alloy, which is comparable to that of the NiTi alloy. However, to the best of our knowledge, quantitative measurements of the recoverable strain by shape memory effect are not available in the literature. We present here some quantitative results of shape memory effect associated to this phase transformation in Titanium-Gold alloys measured after compression tests.

Martensitic transformation, crystal structure and shape memory effect in Ni55−xMn25Ga20Cox alloys

2019 ◽  
Vol 36 (9) ◽  
pp. 961-965
Author(s):  
A. Brzoza ◽  
S. Sumara ◽  
A. Wierzbicka-Miernik ◽  
W. Maziarz ◽  
M. J. Szczerba
Keyword(s):  
Crystal Structure ◽  
Martensitic Transformation ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect
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