skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Confined martensitic phase transformation kinetics and lattice dynamics in Ni–Co–Fe–Ga shape memory alloys

Abstract

Here we describe insights into the phase transformation kinetics and lattice dynamics associated with the newly discovered confined martensitic transformation, which are of great significance to the in-depth understanding of the phase transformation behavior responsible for the rich new physical phenomena in shape memory alloys and could shed light on the design of novel multifunctional properties through tuning the confined martensitic transformation.

Authors:
; ; ; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
Foreign
OSTI Identifier:
1245857
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Materialia; Journal Volume: 110; Journal Issue: C
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Cong, Daoyong, Rule, Kirrily Clair, Li, Wen-Hsien, Lee, Chi-Hung, Zhang, Qinghua, Wang, Haoliang, Hao, Yulin, Wang, Yandong, and Huang, E-Wen. Confined martensitic phase transformation kinetics and lattice dynamics in Ni–Co–Fe–Ga shape memory alloys. United States: N. p., 2016. Web. doi:10.1016/j.actamat.2016.03.008.
Cong, Daoyong, Rule, Kirrily Clair, Li, Wen-Hsien, Lee, Chi-Hung, Zhang, Qinghua, Wang, Haoliang, Hao, Yulin, Wang, Yandong, & Huang, E-Wen. Confined martensitic phase transformation kinetics and lattice dynamics in Ni–Co–Fe–Ga shape memory alloys. United States. doi:10.1016/j.actamat.2016.03.008.
Cong, Daoyong, Rule, Kirrily Clair, Li, Wen-Hsien, Lee, Chi-Hung, Zhang, Qinghua, Wang, Haoliang, Hao, Yulin, Wang, Yandong, and Huang, E-Wen. Fri . "Confined martensitic phase transformation kinetics and lattice dynamics in Ni–Co–Fe–Ga shape memory alloys". United States. doi:10.1016/j.actamat.2016.03.008.
@article{osti_1245857,
title = {Confined martensitic phase transformation kinetics and lattice dynamics in Ni–Co–Fe–Ga shape memory alloys},
author = {Cong, Daoyong and Rule, Kirrily Clair and Li, Wen-Hsien and Lee, Chi-Hung and Zhang, Qinghua and Wang, Haoliang and Hao, Yulin and Wang, Yandong and Huang, E-Wen},
abstractNote = {Here we describe insights into the phase transformation kinetics and lattice dynamics associated with the newly discovered confined martensitic transformation, which are of great significance to the in-depth understanding of the phase transformation behavior responsible for the rich new physical phenomena in shape memory alloys and could shed light on the design of novel multifunctional properties through tuning the confined martensitic transformation.},
doi = {10.1016/j.actamat.2016.03.008},
journal = {Acta Materialia},
number = C,
volume = 110,
place = {United States},
year = {Fri Sep 02 00:00:00 EDT 2016},
month = {Fri Sep 02 00:00:00 EDT 2016}
}
  • The effect of Co addition on crystal structure, martensitic transformation, Curie temperature and compressive properties of Ni{sub 53-x}Mn{sub 25}Ga{sub 22}Co{sub x} alloys with the Co content up to 14 at% was investigated. An abrupt decrease of martensitic transformation temperature was observed when the Co content exceeded 6 at.%, which can be attributed to the atomic disorder resulting from the Co addition. Substitution of Co for Ni proved efficient in increasing the Curie temperature. Compression experiments showed that the substitution of 4 at.% Co for Ni did not change the fracture strain, but lead to the increase in the compressive strengthmore » and the decrease in the yield stress. This study may offer experimental data for developing high performance ferromagnetic shape memory alloys.« less
  • Temperature dependence of the magnetic microstructure in a ferromagnetic shape memory alloy Ni{sub 51}Fe{sub 22}Ga{sub 27} has been studied by electron holography, by which the distribution of magnetic flux is clearly imaged. Although the magnetic flux is quite even in the parent phase near room temperature, it undergoes considerable modulation when the temperature approaches M{sub s} (martensitic transformation start temperature). The magnetization distribution in the martensite appears to be inherited from that in the parent phase. The observations shed further light on the precursor phenomenon of martensitic transformations.
  • Optical and magneto-optical properties of single crystal of Ni{sub 50.1}Mn{sub 28.4}Ga{sub 21.5} magnetic shape memory alloy during its transformation from martensite to austenite phase were systematically studied. Crystal orientation was approximately along (100) planes of parent cubic austenite. X-ray reciprocal mapping confirmed modulated 10 M martensite phase. Temperature depended measurements of saturation magnetization revealed the martensitic transformation at 335 K during heating. Magneto-optical spectroscopy and spectroscopic ellipsometry were measured in the sample temperature range from 297 to 373 K and photon energy range from 1.2 to 6.5 eV. Magneto-optical spectra of polar Kerr rotation as well as the spectra of ellipsometric parameter Ψ exhibitedmore » significant changes when crossing the transformation temperature. These changes were assigned to different optical properties of Ni-Mn-Ga in martensite and austenite phases due to modification of electronic structure near the Fermi energy during martensitic transformation.« less
  • The work hardening caused by martensitic transformation (WHM) is known to result in an increase in the shape recovery degree. In Fe-Ni-Nb alloys, the hard particles of Ni/sub 3/Nb and Fe/sub 2/Nb-type effectively prevent dislocation movement and partially constrict transformation hysteresis as well as increasing the shape recovery degree. It should be expected that WHM has a significant influence on both the martensitic transformation characteristics and shape memory effect in these alloys. The alloys under study were cast in a vacuum induction furnace by using materials: Ni - 99.8%, Fe - 99.0%, Nb - 99.2%. The alloys were hot rolledmore » into rods of 5 mm in diameter, then homogenized at 1150{sup 0}C for 75 h. The critical temperatures of martensitic transformation, and quantitative characteristics of the shape memory effect, were determined by a threepoint deflection scheme using 3 X 0.3 X 30 mm samples, as described in detail. The microstructure was investigated by optical microscopy. X-ray analysis was carried out by using a difractometer at room temperature.« less
  • The structure, magnetic, and martensitic properties of Fe doped Ni-Mn-In magnetic shape memory alloys have been studied by differential scanning calorimetry, magnetization, resistivity, X-ray diffraction (XRD), and EXAFS. While Ni{sub 2}MnIn{sub 1−x}Fe{sub x} (0 ≤ x ≤ 0.6) alloys are ferromagnetic and non martensitic, the martensitic transformation temperature in Ni{sub 2}Mn{sub 1.5}In{sub 1−y}Fe{sub y} and Ni{sub 2}Mn{sub 1.6}In{sub 1−y}Fe{sub y} increases for lower Fe concentrations (y ≤ 0.05) before decreasing sharply for higher Fe concentrations. XRD analysis reveals presence of cubic and tetragonal structural phases in Ni{sub 2}MnIn{sub 1−x}Fe{sub x} at room temperature with tetragonal phase content increasing with Fe doping. Even though the local structuremore » around Mn and Ni in these Fe doped alloys is similar to martensitic Mn rich Ni-Mn-In alloys, presence of ferromagnetic interactions and structural disorder induced by Fe affect Mn-Ni-Mn antiferromagnetic interactions resulting in suppression of martensitic transformation in these Fe doped alloys.« less