TITLE

Ab initio investigation of twin boundary motion in the magnetic shape memory Heusler alloy Ni2MnGa

AUTHOR(S)
Gruner, Markus; Entel, Peter; Opahle, Ingo; Richter, Manuel
PUB. DATE
June 2008
SOURCE
Journal of Materials Science;Jun2008, Vol. 43 Issue 11, p3825
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Magnetic shape memory (MSM) alloys, which transform martensitically below the Curie temperature in the ferromagnetic (FM) state, represent a new class of actuators. In Ni2MnGa, unusually large magnetic field-induced strains of about 10% have been observed. This effect is related to a high mobility of martensitic twin boundaries in connection with a large magneto-crystalline anisotropy. MSM materials exist in a variety of different martensitic structures depending on temperature and compositions. We investigate the energetics of L10 phase twin boundary motion quasi-statically with ab initio methods and relate the results to calculations of the magneto-crystalline anisotropy energy. Our results indicate that for the L10 structure the energy needed for a coherent shift of a twin boundary may be too large to be overcome solely by magnetic field-induced strains.
ACCESSION #
31975687

 

Related Articles

  • Anomaly of critical stress in stress-induced transformation of NiCoMnIn metamagnetic shape memory alloy. Xu, Xiao; Ito, Wataru; Umetsu, Rie Y.; Kainuma, Ryosuke; Ishida, Kiyohito // Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p181905 

    Stress-induced martensitic transformation below room temperature for a Ni45Co5Mn36.1In13.9 single-crystal, in which no martensitic transformation occurs during cooling down to 4.2 K under zero stress, was investigated by using compression test. The equilibrium stress estimated from the critical...

  • Phase-field simulations of stress-strain behavior in ferromagnetic shape memory alloy Ni2MnGa. Wu, P. P.; Ma, X. Q.; Zhang, J. X.; Chen, L. Q. // Journal of Applied Physics;Oct2008, Vol. 104 Issue 7, p073906 

    The evolution of strain, magnetic domain structure, and martensite microstructure during compressive stress loading and unloading of Ni2MnGa was studied using a phase-field model at several selected magnetic fields. We observed a typical quasiplastic behavior at zero field and a pseudoelastic...

  • Magnetic field influence on the structural transformation in ferromagnetic shape memory alloy Mn50Ni40In10 melt spun ribbons. Sánchez Llamazares, J. L.; Hernando, B.; Prida, V. M.; García, C.; González, J.; Varga, R.; Ross, C. A. // Journal of Applied Physics;Apr2009, Vol. 105 Issue 7, p07A945 

    Direct and reverse martensitic transformations have been studied in Mn50Ni40In10 ribbons by means of magnetization and electrical resistivity measurements. The alloy is L21-type single-phase austenite, which transforms into a 14M monoclinic martensite. The martensitic transformation is...

  • Martensitic transformation and shape memory effect in a ferromagnetic shape memory alloy: Mn2NiGa. Liu, G. D.; Chen, J. L.; Liu, Z. H.; Dai, X. F.; Wu, G. H.; Zhang, B.; Zhang, X. X. // Applied Physics Letters;12/26/2005, Vol. 87 Issue 26, p262504 

    Heusler alloy Mn2NiGa has been developed by synthesizing a series of ferromagnetic shape memory alloys Mn25+xNi50-xGa25 (x=0–25). Mn2NiGa exhibits a martensitic transformation around room temperature with a large thermal hysteresis up to 50 K and a lattice distortion as large as 21.3% and...

  • Micromagnetic study of Ni[sub 2]MnGa under applied field (invited). Pan, Qi; James, R. D. // Journal of Applied Physics;5/1/2000, Vol. 87 Issue 9, p4702 

    We present an experimental study of the domain and twin structure in the martensitic phase of the ferromagnetic shape memory alloy Ni[sub 2]MnGa using magnetic force microscopy. After cooling through the austenite–martensite transformation under no field, a rectangular specimen with {100}...

  • Effect of reactive stresses on the heat of martensitic transformations in titanium nickelide. Egorov, S. // Technical Physics;Aug2006, Vol. 51 Issue 8, p999 

    Calorimetric studies of titanium nickelide show that thermally reversible prestraining does not affect the heat of the B2 → R and R → B2 martensitic transformations. At the same time, reactive stresses induced by straining under constrained conditions are found to decrease the heat...

  • Development of Stress-Induced Martensitic Transformation in TiNi Shape Memory Alloy. Pieczyska, Elzbieta; Staszczak, Maria; Dunić, Vladimir; Slavković, Radovan; Tobushi, Hisaaki; Takeda, Kohei // Journal of Materials Engineering & Performance;Jul2014, Vol. 23 Issue 7, p2505 

    TiNi shape memory alloy (SMA) was subjected to tension at strain-controlled test on quasistatic testing machine. The nucleation, development, and saturation of the stress-induced martensitic transformation were investigated, taking into account the obtained dependency of mechanical parameters...

  • Effect of Pre-straining on the Shape Recovery of Fe-Mn-Si-Cr-Ni Shape Memory Alloys. Maji, Bikas; Krishnan, Madangopal; Verma, Amit; Basu, R.; Samajdar, I.; Ray, Ranjit // Metallurgical & Materials Transactions. Part A;Feb2015, Vol. 46 Issue 2, p639 

    The effect of pre-straining on the shape recovery behavior of Fe-14Mn-6Si-9Cr-5Ni (wt pct) shape memory alloy (SMA) has been studied. The shape recovery associated with the reverse ε martensitic transformation, i.e., ε → γ, was characterized by dilatometry using specimens which...

  • EFFECT OF TRANSFORMATION VOLUME STRAIN ON THE SPHERICAL INDENTATION OF SHAPE MEMORY ALLOYS. YAN, WENYI; SUN, QINGPING; LIU, HONG-YUAN // International Journal of Modern Physics B: Condensed Matter Phys;12/30/2008, Vol. 22 Issue 31/32, p5957 

    The mechanical response of spherical indentation of superelastic shape memory alloys (SMAs) was theoretically studied in this paper. Firstly, the friction effect was examined. It was found that the friction influence is negligibly small. Secondly, the influence of the elasticity of the indenter...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics