Study on phase formation in magnetic FeCoNiMnV high entropy alloy produced by mechanical alloying

Alijani, Fatemeh; Reihanian, M.; Gheisari, Kh.

doi:10.1016/j.jallcom.2018.09.204

Cited by 59 publications

(15 citation statements)

References 35 publications

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“…In the case of the present alloying system, the evaluation of the phase formation criteria was established in the previous research . Accordingly, the formation of a mixture of BCC and FCC solid solutions is predicted based on these criteria.…”

Section: Discussionmentioning

confidence: 99%

“…The 48 h-milled powder contains four phases, namely FCC, BCC1, BCC2, and a tetragonal phase. [30] Sintering at 500 C ( Figure 5a) reveals no specific changes in the number of phases. The only change is the formation of an FCC phase with the chemical composition near the stoichiometric one (Point 5 in Figure 5a and Table 2).…”

Section: Sem/tem Analysismentioning

confidence: 96%

“…[24,35] In the case of the present alloying system, the evaluation of the phase formation criteria was established in the previous research. [30] Accordingly, the formation of a mixture of BCC and FCC solid solutions is predicted based on these criteria. Nonetheless, the sigma phase is also observed due to the presence of sigma-forming elements (e.g., V).…”

Section: Phase Prediction Based On the Physical Criteriamentioning

confidence: 99%

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Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

et al. 2019

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The microstructure and phase evolution of the mechanically alloyed FeCoNiMnV high entropy alloy during spark plasma sintering are examined. The milled powders are sintered at different temperatures ranging between 500 C and 1000 C. A multiphase structure is produced during the sintering process. The produced alloy experiences different types of decompositions and phase formations as the sintering temperature is raised. During sintering at different temperatures, the body centered cubic and face centered cubic (FCC) phases are transformed to new FCC and tetragonal phases. According to the results, V does not show the tendency to dissolve into the structure and the tetragonal phases, mainly composed of V and Mn, tending to be formed in addition to the FCC solid solution. Sintering at 900 C results in the grain size of about 220 nm, attaining the highest hardness of about 450 HV. The sintered alloy at 1000 C shows the highest relative density (about 98%) with an average grain size of about 580 nm. The phase formation is predicted and evaluated by different criteria, and the consistency between the theoretical and experimental results is explained.

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Section: Discussionmentioning

confidence: 99%

Section: Sem/tem Analysismentioning

confidence: 96%

Section: Phase Prediction Based On the Physical Criteriamentioning

confidence: 99%

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Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

et al. 2019

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“…In the past decade, HEAs have drawn extensive attention because of their excellent mechanical and chemical properties, such as great thermal stability [15], good corrosion resistance [16,17], good wear resistance [18], excellent strength [19] and high hardness [20]. Some HEAs show soft magnetic properties due to their ferromagnetic elements such as Fe, Co and Ni [21][22][23][24][25]. Zuo et al [26] showed that the CoNiMnGa HEAs had a high saturation magnetisation (M s ) of about 115.92 emu/g, and a low coercivity (H c ) of about 27.9 Oe.…”

Section: Introductionmentioning

confidence: 99%

The AC Soft Magnetic Properties of FeCoNixCuAl (1.0 ≤ x ≤ 1.75) High-Entropy Alloys

Wang

Zhang

et al. 2019

Materials

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High-entropy alloys (HEAs) with soft magnetic properties are one of the new candidate soft magnetic materials which are usually used under an alternating current (AC) magnetic field. In this work, the AC soft magnetic properties are investigated for FeCoNixCuAl (1.0 ≤ x ≤ 1.75) HEAs. The X-ray diffraction (XRD) and scanning electron microscope (SEM) show that the alloy consists of two phases, namely a face-centred cubic (FCC) phase and a body-centred cubic (BCC) phase. With increasing Ni content, the FCC phase content increased. Further research shows that the AC soft magnetic properties of these alloys are closely related to their phase constitution. Increasing the FCC phase content contributes to a decrease in the values of AC remanence (AC Br), AC coercivity (AC Hc) and AC total loss (Ps), while it is harmful to the AC maximum magnetic flux density (AC Bm). Ps can be divided into two parts: AC hysteresis loss (Ph) and eddy current loss (Pe). With increasing frequency f, the ratio of Ph/Ps decreases for all samples. When f ≤ 150 Hz, Ph/Ps > 70%, which means that Ph mainly contributes to Ps. When f ≥ 800 Hz, Ph/Ps < 40% (except for the x = 1.0 sample), which means that Pe mainly contributes to Ps. At the same frequency, the ratio of Ph/Ps decreases gradually with increasing FCC phase content. The values of Pe and Ph are mainly related to the electrical resistivity (ρ) and the AC Hc, respectively. This provides a direction to reduce Ps.

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“…Recently, the good magnetic properties of HEAs capture the increasing interest in this new field of materials [ 15 , 16 ]. It is worth noting that many HEAs [ 17 , 18 , 19 , 20 ] consist of several ferromagnetic elements, such as Fe, Co, and Ni, and they also have a good comprehensive mechanical properties, which make them have great application potential in soft magnetic materials. HEAs with good magnetic and mechanical properties are expected to be used in electric motors, electromagnets, and magnetic recording.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Microstructure of FeCoNi(CuAl)0.8Snx (0 ≤ x ≤ 0.10) High-Entropy Alloys

Wang

et al. 2018

Entropy

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The present work exhibits the effects of Sn addition on the magnetic properties and microstructure of FeCoNi(CuAl)0.8Snx (0 ≤ x ≤ 0.10) high-entropy alloys (HEAs). The results show all the samples consist of a mixed structure of face-centered-cubic (FCC) phase and body-centered-cubic (BCC) phase. The addition of Sn promotes the formation of BCC phase, and it also affects the shape of Cu-rich nano-precipitates in BCC matrix. It also shows that the Curie temperatures (Tc) of the FCC phase and the saturation magnetization (Ms) of the FeCoNi(CuAl)0.8Snx (0 ≤ x ≤ 0.10) HEAs increase greatly while the remanence (Br) decreases after the addition of Sn into FeCoNi(CuAl)0.8 HEA. The thermomagnetic curves indicate that the phases of the FeCoNi(CuAl)0.8Snx (0 ≤ x ≤ 0.10) HEAs will transform from FCC with low Tc to BCC phase with high Tc at temperature of 600–700 K. This work provides a new idea for FeCoNi(CuAl)0.8Snx (0 ≤ x ≤ 0.10) HEAs for their potential application as soft magnets to be used at high temperatures.

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Study on phase formation in magnetic FeCoNiMnV high entropy alloy produced by mechanical alloying

Cited by 59 publications

References 35 publications

Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

Microstructural Characterization of Mechanically Alloyed FeCoNiMnV High Entropy Alloy Consolidated by Spark Plasma Sintering

The AC Soft Magnetic Properties of FeCoNixCuAl (1.0 ≤ x ≤ 1.75) High-Entropy Alloys

Magnetic Properties and Microstructure of FeCoNi(CuAl)0.8Snx (0 ≤ x ≤ 0.10) High-Entropy Alloys

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