Influence of fluxing in the preparation of bulk Fe-based glassy alloys

Duhamel, C.; Georgarakis, K.; LeMoulec, A.; Yavari, A.R.; Vaughan, Gavin; Baron, A. A.; Lupu, N.

doi:10.1016/j.jallcom.2008.08.132

Cited by 13 publications

(5 citation statements)

References 15 publications

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“…These elements are well-known effective additions increasing hardenability of steels by slowing down diffusive phase transformations [17]. Similar to PdeNieCueP alloys some of Fe-based BMG were successfully subjected to flux treatment used to improve their glass-forming ability [18,19].…”

Section: Introductionmentioning

confidence: 99%

Crystallization behavior of Fe- and Co-based bulk metallic glasses and their glass-forming ability

Louzguine-Luzgin

Базлов

Ketov

et al. 2015

Materials Chemistry and Physics

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Section: Introductionmentioning

confidence: 99%

Crystallization behavior of Fe- and Co-based bulk metallic glasses and their glass-forming ability

Louzguine-Luzgin

Базлов

Ketov

et al. 2015

Materials Chemistry and Physics

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“…The most remarkable success was reported for Pd-based alloys, where a BMG with a diameter as large as 72 mm was achieved by cleaning the melt using B 2 O 3 fluxing 17, 18 . B 2 O 3 fluxing also had marked effects on Fe 40 Ni 40 P 14 B 6 melts, resulting in a reduction of about three orders of magnitude in the critical cooling rate required for BMG formation and the widening of the supercooled liquid region by ~30 °C 19, 20 . However, the use of B 2 O 3 fluxing has been limited to Pd-, Fe-B- and Pt- based systems, because it is only effective for alloys in which all the major constituent elements have an affinity to oxygen lower than boron 16, 19, 21, 22 .…”

Section: Introductionmentioning

confidence: 99%

“…B 2 O 3 fluxing also had marked effects on Fe 40 Ni 40 P 14 B 6 melts, resulting in a reduction of about three orders of magnitude in the critical cooling rate required for BMG formation and the widening of the supercooled liquid region by ~30 °C 19, 20 . However, the use of B 2 O 3 fluxing has been limited to Pd-, Fe-B- and Pt- based systems, because it is only effective for alloys in which all the major constituent elements have an affinity to oxygen lower than boron 16, 19, 21, 22 . In the prototypical BMG-forming alloys, such as those based on Zr or Ti 23–26 , where the primary elements have high oxygen affinity, there is a pressing need for an effective fluxing agent.…”

Section: Introductionmentioning

confidence: 99%

Melt fluxing to elevate the forming ability of Al-based bulk metallic glasses

Yang

Zhang

et al. 2017

Sci Rep

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Salt-fluxing treatment is an effective technique to improve the glass-forming ability (GFA) of bulk metallic glass (BMG)-forming melts, as demonstrated before in Pd- and Fe-based systems. However, it has been challenging to develop similar fluxing protocol for more reactive melts, such as Al-rich BMG-forming systems. Here we design new fluxing agents, from a thermodynamics perspective that takes into account combined effects of physical absorption and chemical absorption (reaction) between the fluxing agents and oxide inclusions. MgCl2-CaCl2 composite salts were selected, and their fluxing effects were systematically studied on an Al86Ni6.75Co2.25Y3.25La1.75 alloy, the best BMG-forming composition reported thus far for Al-rich alloy systems. The oxygen content was found to continuously decrease in the master alloy with increasing cycles of salt-fluxing treatment, with chlorate products on the surface suggesting concurrent physical absorption and chemical reaction. The fluxing treatment developed has enabled a record critical size (diameter) of 2.5 mm for Al-based BMGs. Our finding is thus an advance in developing highly desirable Al-based BMGs, and also provides guidance for designing processing protocol to produce larger-sized BMGs in other reactive systems.

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“…Three empirical rules for the development of amorphous alloys were proposed by Inoue [2]: (1) multicomponent alloy systems consisting of more than three elements; (2) significant difference in atomic size ratio above 12% among the main three elements; (3) negative heats of mixing among their elements. Upon these empirical rules, various BMG systems have been developed, such as Fe-(Al, Ga)-(P, C, B, Si) [3,4], Fe-(Co, Ni)-(Zr, Nb, Ta, Mo, W, Hf)-B [5][6][7][8][9][10][11][12][13], Fe-(Co, Ni)-M-Si-B (M = Nb, Zr) [14][15][16][17]. The effect of rare earth addition on glass forming ability has been investigated in (Fe, Co)-La-TM-B (La = lanthanide metal, TM = transition metal) systems [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%