Effect of ball milling and post-annealing on magnetic properties of Ni49.8Mn28.5Ga21.7 alloy powders

Tian, B.; Chen, F.; Liu, Yinong; Zheng, Yufeng

doi:10.1016/j.intermet.2008.08.002

Cited by 47 publications

(38 citation statements)

References 25 publications

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“…It is noted that some cracks along the grain boundaries can be found, which should result from the sample grinding and polishing processes. This indicates that the Nb1 alloy presents a susceptible intergranular fracture, which is similar to that of the Nb0 alloy [17]. With increasing Nb content, it is seen that the alloy has changed from single phase to a dual phase.…”

Section: Methodsmentioning

confidence: 66%

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Microstructure, phase transformation and mechanical property of Nb-doped Ni–Mn–Ga alloys

et al. 2015

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Section: Methodsmentioning

confidence: 66%

“…3(b). It is found that all the alloys demonstrate a similar transformation character to that of the Nb0 alloy [17]. The susceptibility changes with a wide hysteresis at the temperature of <0 C corresponds to the martensite4austenite transformation.…”

Section: Methodsmentioning

confidence: 74%

Microstructure, phase transformation and mechanical property of Nb-doped Ni–Mn–Ga alloys

et al. 2015

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“…5). Occurrence of the Curie transition in 15 and 20 h milled samples can be attributed to the fact that magnetic transition required a lower degree of atomic ordering than MT [15].…”

Section: Resultsmentioning

confidence: 99%

Effect of heat treatment on martensitic transformation of Ni47Mn40Sn13 ferromagnetic shape memory alloy prepared by mechanical alloying

et al. 2015

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In this paper, an attempt has been made to synthesis of the nanostructured Ni47Mn40Sn13 ferromagnetic shape memory alloy by ball milling of Ni, Mn and Sn powder mixture. The structure and magnetic evaluation of samples were investigated by X-ray diffraction, transmission electron microscopy, differential scanning calorimetry and AC susceptibility measurements. The results showed that after 20 hours of ball milling, the nanostructured L21-Ni47Mn40Sn13 powder was formed with an average particle size of 5 nm. In the as-milled specimen, the martensitic transformation (MT) was not observed. This was basically due to the atomic disordering and large lattice strain in nanoparticles. However, the annealing of milled specimens at temperatures above 1023K for 16 hours led to the occurrence of MT in nanostructured Ni47Mn40Sn13 powders. We also calculated t-he activation energy of MT by using Kissinger method and it was estimated to be about 52 kJ mol -1 . The results demonstrate that a combination of MA and subsequent heat treatment has the potential to produce Ni-MnSn magnetic shape memory.

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“…[18][19][20] For the ferromagnetic Ni-Mn-Ga alloys, it is found that ball milling not only suppresses the Curie temperature but also weakens the magnetization of the alloy. [12,23] Moreover, the ferromagnetism of the ball-milled Ni-Mn-Ga particles can be restored after annealing at elevated temperatures. [12,23] Here, the high-energy ball-milling method was used to synthesize Ni 50 Mn 36.7 In 13.3 fine-sized particles.…”

Section: Introductionmentioning

confidence: 99%

“…[12,23] Moreover, the ferromagnetism of the ball-milled Ni-Mn-Ga particles can be restored after annealing at elevated temperatures. [12,23] Here, the high-energy ball-milling method was used to synthesize Ni 50 Mn 36.7 In 13.3 fine-sized particles. It was found that the Ni 50 Mn 36.7 In 13.3 particles transformed to an amorphous-like phase after ball milling for 8 hours.…”

Section: Introductionmentioning

confidence: 99%

Structural Transitions and Magnetic Properties of Ni50Mn36.7In13.3 Particles with Amorphous-Like Phase

Liu

Nie

Ren

et al. 2011

Metall Mater Trans A

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The high-energy ball-milling method was used for fabricating Ni 50 Mn 36.7 In 13.3 fine-sized particles. The as-melt polycrystalline Ni 50 Mn 36.7 In 13.3 alloy exhibits a 14 M modulated martensite structure at room temperature (RT). The atomic pair distribution function analysis together with the differential scanning calorimetry technique proved that the 14 M modulated martensite transformed to a metastable amorphous-like structure after ball milling for 8 hours. Annealing of the ball-milled particles with the amorphous-like phase first led to the crystallization to form a B2 structure at 523 K (250°C), and then an ordered Heusler L2 1 structure (with a small tetragonal distortion) at 684 K (411°C). The annealed particles undergo different structural transitions during cooling, tailored by the atomic arrangements of the high-temperature phase. Low-field thermomagnetization measurements show that the ball-milled particles with the amorphous-like structure or the atomically disordered crystalline structure exhibit a magnetic transition from the paramagnetic-like to the spin-glass state with decreasing temperature, whereas the crystalline particles with the ordered Heusler L2 1 structure present a ferromagnetic behavior with the Curie temperature T c % 310 K (37°C).

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Effect of ball milling and post-annealing on magnetic properties of Ni49.8Mn28.5Ga21.7 alloy powders

Cited by 47 publications

References 25 publications

Microstructure, phase transformation and mechanical property of Nb-doped Ni–Mn–Ga alloys

Microstructure, phase transformation and mechanical property of Nb-doped Ni–Mn–Ga alloys

Effect of heat treatment on martensitic transformation of Ni47Mn40Sn13 ferromagnetic shape memory alloy prepared by mechanical alloying

Structural Transitions and Magnetic Properties of Ni50Mn36.7In13.3 Particles with Amorphous-Like Phase

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