Effects of nanocrystal formation on the soft magnetic properties of Fe-based bulk metallic glasses

Abstract

Articles you may be interested inEnhancement of glass-forming ability of Fe-based bulk metallic glasses with high saturation magnetic flux density AIP Advances 2, 022169 (2012); 10.1063/1.4733340Effect of P addition on nanocrystallization and high temperature magnetic properties of low B and Nb containing FeCo nanocomposites

Effect of Al addition on the glass forming ability, thermal stability and soft magnetic properties of (Fe0.83P0.16Cu0.01)100−xAlx nanocrystalline alloys

“…Fe-based nanocrystalline soft magnetic alloys have been extensively investigated in physics [1][2][3] , material science [4] as well as engineering application [5] due to their excellent soft magnetic properties such as low coercivity, low magnetic core loss, high permeability, and high magnetic flux density, compared with conventional materials [6] . They are widely used for various actual applications such as transformers, motors, inductors, etc.…”

A comparative study on the isochronal and isothermal crystallization kinetics of Co46.45Fe25.55Ta8B20 soft magnetic metallic glass with high thermal stability

“…It is well-known that many physical and mechanical properties of MGs can significantly change upon (partial) devitrification [9][10][11]. For example, several studies have indicated that the controlled formation of nanocrystals in an amorphous matrix during heating of some Fe-based MGs can drastically improve their magnetic properties [12,13]. Moreover, a noticeable enhancement in strength and toughness has been obtained in some Al-Ni-based amorphous alloys by partial crystallization via the development of ductile crystals in the amorphous matrix [14].…”

Nanocrystallization in a Cu-doped Fe-based metallic glass

“…Alloy ingots with a nominal composition of Fe 75.3 C 7.0 Si 3.3 B 5.0 P 8.7 Cu 0.7 (at. %) [13], hereafter designated as Cu0.7, were prepared by arc-melting a mixture of pure elements (99.9 %) and the Fe-P alloys (P: 26.28, Si:0.01, C:0.02, Mn:0.69, Ti:0.35, Ca:0.01, S: 0.01 wt%) under an argon atmosphere. Ribbon samples with a width of 1-2 mm and a thickness of 30-50 m were prepared by the melt-spinning technique.…”

“…Furthermore, an appropriate annealing below the glass transition temperature (T g ) was verified to further improve the M s value of these Cu-doped Fe-based BMGs, whereas over-aging was found to deteriorate the soft magnetic properties [13][14][15]. As pointed out by Hono et al [14,15], Cu atomic clusters were present in the amorphous state after annealing below the crystallization temperature and gave rise to formation of a high density of tiny α-Fe particles, which might be responsible for the M s enhancement [13][14][15]. Even though effects of Cu additions on heterogeneous nanocrystallization and dependence of magnetic properties on annealing conditions have been investigated in several Fe-based metallic glasses, limited studies regarding the entire dynamic crystallization process were conducted [16,17], especially in those which have a complex atomic structure and nanocrystallization process [18].…”

“…Recently, it was reported that with minor additions of the Cu element which has positive heat of mixing with Fe, both the GFA and soft magnetic and mechanical properties of Febased BMGs were dramatically enhanced [9][10][11][12]. Furthermore, an appropriate annealing below the glass transition temperature (T g ) was verified to further improve the M s value of these Cu-doped Fe-based BMGs, whereas over-aging was found to deteriorate the soft magnetic properties [13][14][15]. As pointed out by Hono et al [14,15], Cu atomic clusters were present in the amorphous state after annealing below the crystallization temperature and gave rise to formation of a high density of tiny α-Fe particles, which might be responsible for the M s enhancement [13][14][15].…”