Martensitic transformation in melt-spun Ni-Mn-Ga ribbons

Goryczka, Tomasz; Lelątko, J.; Górka-Kostrubiec, Beata; Ochin, P.; Morawiec, H.

doi:10.1140/epjst/e2008-00665-3

Cited by 10 publications

(10 citation statements)

References 11 publications

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“…This type of fibre texture is different from the so-far reported {100} fibre texture observed for meltspun ribbons of the Ni 2 MnGa type HA [5]. Observed declination of the 111 crystal direction by about 10 degrees opposite to the spinning direction is not an unusual phenomenon in melt-spun ribbons [6] and is ascribed to the thermal gradient experienced in the melt-spinning process.…”

Section: Resultscontrasting

confidence: 72%

Structure of Melt-Spun Co_2MnAl Heusler Alloy

et al. 2017

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The growth-related microstructure and texture of the Co2MnAl-type Heusler alloy in the form of a melt-spun ribbon was studied by electron microscopy, electron backscattered diffraction and X-ray diffraction. It is shown that melt spinning produces a single-phase disordered Heusler alloy. The fine grain structure at the wheel side of the ribbon exhibits no texture, while dominant columnar grain structure formed on the free surface side exhibits the 111 fibre texture with a declination by about 10 degrees in the spinning direction. The dendritic growth of columnar crystals causes inhomogeneity of the chemical composition on a micrometre scale with a higher Co and Al concentration in the centre of dendritic arms and a higher concentration of Mn at the dendrite arm boundaries.

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Section: Resultscontrasting

confidence: 72%

Structure of Melt-Spun Co_2MnAl Heusler Alloy

et al. 2017

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“…It was observed that martensitic (M S , M F , T MI ) and austenitic (A S , A F , T AI ) characteristic temperatures decreased at an approximate rate of 43-45 K per Mn atoms. These values are much higher than the drop in transformation temperatures (TT) by 20-25 K per Mn atom [23,24]. Investigations also suggest that TT decreased by 20 K per decrease in Ni atom [25].…”

Section: Discussionmentioning

confidence: 86%

“…In a sharp contrast to Mn-22, the alloy Mn-29 showed granular microstructure ( Fig. 15a) with dislocations [24]. At higher magnification the dislocations appear as a bulge type trails (Fig.…”

Section: Discussionmentioning

confidence: 94%

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Effect of Mn incorporation for Ni on the properties of melt spun off-stoichiometric compositions of NiMnGa alloys

Panda¹,

Singh²,

Roy³

et al. 2011

Journal of Magnetism and Magnetic Materials

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“…11,12 Among them melt spinning is an effective way to produce textured polycrystalline ribbons of FSMAs. 3,5,6 However there is only limited information on the FSMA ribbons. Compared to the as-cast master alloy, the asquenched ribbon exhibits lowered martensitic transformation temperature T M , Curie temperature T C , and saturation magnetization M S .…”

Section: Introductionmentioning

confidence: 99%

Anomalous magnetizations in melt spinning Ni–Mn–Ga

Wang

Jiang

Techapiesancharoenkij

et al. 2009

Journal of Applied Physics

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The structural and magnetic characteristics were studied for martensitic and austenitic Ni-Mn-Ga melt-spun ribbons of as quenched and as annealed at different temperatures. No essential structure change was found before and after annealing, but there are some anomalies in the magnetization process. In the austenite state the M͑T͒ curves measured in 100 Oe field exhibit a Hopkinson peak at T C for the ribbons of as quenched and annealed at 573 and 773 K, but the curves monotonically decays to zero with the increasing temperature to T C after annealing at 1073 K. In the martensite phase of both as quenched and 573 K annealed ribbons an abrupt increase in the slope of the M͑H͒ curve was observed; it appears to be due to the onset of magnetic-field-induced twin boundary motion. The abrupt slope change disappeared in the ribbons annealed at temperatures higher than 773 K. The ribbon processing history and particularly the quenched-in internal stress were modeled to probe the possible mechanisms for the anomalous magnetization behaviors, combining the grain-grain strain stored in the polycrystalline. The annealing temperatures were clarified into three groups according to their effects on the magnetization behaviors of the austenite and martensite.

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Martensitic transformation in melt-spun Ni-Mn-Ga ribbons

Cited by 10 publications

References 11 publications

Structure of Melt-Spun Co_2MnAl Heusler Alloy

Structure of Melt-Spun Co_2MnAl Heusler Alloy

Effect of Mn incorporation for Ni on the properties of melt spun off-stoichiometric compositions of NiMnGa alloys

Anomalous magnetizations in melt spinning Ni–Mn–Ga

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