Preparation, thermal stability, and magnetic properties of FeCoZrMoWB bulk metallic glass

Liu, D.Y.; Sun, Wei; Wang, A.M.; Zhang, H.F.; Hu, Z. Q.

doi:10.1016/j.jallcom.2003.09.116

Cited by 30 publications

(15 citation statements)

References 22 publications

(20 reference statements)

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“…A few additional peaks have also been noted indicating that at least another unidentified phase exists. A similar phase constitution was also observed in the bulk metallic glass of the same composition, but processed by the solidification route [24]. Since (␣-Fe) is the major phase in the crystallization product, and it is the first phase to form as a result of crystallization of the amorphous phase, it may be assumed that the presence of the (␣-Fe) phase in the milled powder suggests start of crystallization of the amorphous phase on milling the powder for 50 h; almost complete crystallization has occurred on annealing the powder at 700 • C.…”

Section: External Heat Treatmentsupporting

confidence: 74%

“…It has been clearly shown in several instances [10,11,25] that the powder temperature increases during milling. Even though some investigators assume a very large instantaneous local temperature rise, the global temperature rise was never reported to be more than about 200 • C. Since the crystallization temperature of the present Fe-based metallic glass has been reported to be 950 K [24], it is unlikely that formation of the ␣-Fe phase during milling is due to an increase of the powder temperature to a value above that of the crystallization temperature of the amorphous phase.…”

Section: Possible Reasons For the Primary Crystallization Of The Amormentioning

confidence: 76%

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An unusual phase transformation during mechanical alloying of an Fe-based bulk metallic glass composition

Patil

Hong

Suryanarayana

2005

Journal of Alloys and Compounds

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Section: External Heat Treatmentsupporting

confidence: 74%

Section: Possible Reasons For the Primary Crystallization Of The Amormentioning

confidence: 76%

An unusual phase transformation during mechanical alloying of an Fe-based bulk metallic glass composition

Patil

Hong

Suryanarayana

2005

Journal of Alloys and Compounds

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“…All the parts have different temperatures wherein the part attached to the balls can be experience significantly high temperatures (in the order of several hundreds of°C) depends on the milling conditions [37].This can be the reason that the crystalline phases creates from the amorphous phase during MA. On the other hand, it is recognized that, due to the severe collision between the milling media and the milled powders, local (microscopic) temperature rising can be considerably high, often more than the melting points of some alloying systems [25,36,38]. Since the crystallization temperature of the present alloying system is around 500°C (concerning the thermal analysis results done on the as-milled powders which is not reported in the present paper), it can be inferred that the mechano-crystallization of the amorphous phase during milling is due to the increase of the powders temperature to a value well-above the crystallization temperature of the amorphous phase.…”

Section: Qualitative Phase Analysismentioning

confidence: 99%

Phase transformation during mechano-synthesis of nanocrystalline/amorphous Fe–32Mn–6Si alloys

Amini

Shamsipoor

Ghaffari

et al. 2013

Materials Characterization

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Mechano-synthesis of Fe-32Mn-6Si alloy by mechanical alloying of the elemental powder mixtures was evaluated by running the ball milling process under an inert argon gas atmosphere. In order to characterize the as-milled powders, powder sampling was performed at predetermined intervals from 0.5 to 192 h. X-ray florescence analyzer, X-ray diffraction, scanning electron microscope, and high resolution transmission electron microscope were utilized to investigate the chemical composition, structural evolution, morphological changes, and microstructure of the as-milled powders, respectively.According to the results, the nanocrystalline Fe-Mn-Si alloys were completely synthesized after 48 h of milling. Moreover, the formation of a considerable amount of amorphous phase during the milling process was indicated by quantitative X-ray diffraction analysis as well as high resolution transmission electron microscopy image and its selected area diffraction pattern. It was found that the α-to-γ and subsequently the amorphous-to-crystalline (especially martensite) phase transformation occurred by milling development. © 2013 Elsevier Inc. All rights reserved. Keywords:Fe-Mn-Si shape memory alloys Mechanical alloyingPhase transformation Nanostructural/amorphous phase Microstructure IntroductionFe-Mn-Si alloys are a class of smart materials due to their suitable shape memory effect (SME), excellent machinability and formability, low cost, good weldability and corrosion resistance, and high strength having several industrial applications such as dampers, pipe couplings, big shape memory devices, hard metals or alloys joining, oxygen blowing nozzles and so on [1][2][3][4][5][6][7][8][9][10][11]. The production of stress induced martensite (ε, hcp) from parent austenite phase (γ, fcc) and the reverse transformation (γ to ε) during the heating cycle are the origins of SME in this alloying system [12][13][14][15][16][17][18]. This non-thermoelastic or semi-thermoelastic conversion occurred by the creation of stacking faults (SFs) due to the movement of the Shockley partial dislocations (a γ /6 <112>) in the parent phase. SFs are suitable sites for nucleation of the martensite phase; eventually, the ε-phase can be formed by their overlap [12,[17][18][19][20][21][22][23].Although induction melting under an argon gas atmosphere is widely utilized to produce Fe-based SMAs, solid-state routes such as mechanical alloying (MA) can be used to produce the alloys in the powder form [24]. During MA, by applying the high energy collision between ball and particles and consequently the repeated cold welding and fracture of the powders, not only is the alloying process attained but also the synthesis of the non-equilibrium structures such as supersaturated solid solutions, nanocrystalline and amorphous structures, and intermetallic compounds is possible [24][25][26][27][28].Recently, MA has been widely used to synthesize nanocrystalline and amorphous SMAs [29][30][31], although limited investigations have been done on Fe-Mn-Si alloys.

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“…Among several developed BMG systems, Fe-base BMGs are of particular interest for their combination of magnetic and mechanical applications, such as micro-electronic cores and soft magnet tubes [3,4]. To use Fe-base BMGs for hightemperature applications, an understanding of the oxidation behavior is essential.…”

Section: Introductionmentioning

confidence: 99%

Air oxidation of an Fe72B22Y6 bulk amorphous alloy at 600–700°C

et al. 2006

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Preparation, thermal stability, and magnetic properties of FeCoZrMoWB bulk metallic glass

Cited by 30 publications

References 22 publications

An unusual phase transformation during mechanical alloying of an Fe-based bulk metallic glass composition

An unusual phase transformation during mechanical alloying of an Fe-based bulk metallic glass composition

Phase transformation during mechano-synthesis of nanocrystalline/amorphous Fe–32Mn–6Si alloys

Air oxidation of an Fe72B22Y6 bulk amorphous alloy at 600–700°C

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