Electrochemical corrosion and its influence on magnetic properties of Fe75.5Si13.5B9Nb3Cu1 alloy

Szewieczek, D.; Baron, A. A.

doi:10.1016/j.jmatprotec.2005.02.084

Cited by 27 publications

(13 citation statements)

References 12 publications

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“…For comparison with other amorphous materials, several of the derived corrosion parameters from this study are presented with data from the literature in Table III [16] Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 (Vit 105) 0.05 M Na 2 SO 4 NPO NPO 0.4 Szewieczek and Baron [17] Fe 73.5 Si 13.5 B 9 Nb 9 Cu 1 ‡ 0.5 M Na 2 SO 4 NPO NPO 927 Raju et al [18] Zr-Cu-Al-Ni 0.1 M Na 2 SO 4 NPO NPO ϳ1 Raju et al [18] Zr-Cu-Al-Ni-Nb 0.1 M Na 2 SO 4 NPO NPO ϳ1 Raju et al [18] Zr-Cu-Al-Ni-Ti 0.1 M Na 2 SO 4 NPO NPO ϳ1 Baril and Pebere [19] Pure Mg 0.1 M Na 2 SO 4 NPO NPO ϳ1000 Baril and Pebere [19] …”

Section: Table I Glass-transition (T G ) Crystallization (T X ) Somentioning

confidence: 99%

Electrochemical behavior of Ca-based bulk metallic glasses

Morrison

Buchanan

Liaw

et al. 2006

Metall Mater Trans A

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Since 2002, numerous Ca-based bulk metallic glass (BMG) alloys have been discovered. These BMG alloys are of interest because of their low densities and costs; however, few studies have examined the properties of these novel materials. In this study, the thermophysical and electrochemical behavior of three Ca-based BMGs was examined and compared to a crystalline, Mg-based alloy. Cyclic-anodic polarization tests were conducted in a 0.05 M Na 2 SO 4 electrolyte, and posttest analyses by scanning electron microscopy were conducted to assess the damage to the exposed surfaces. SINCE the late 1980s, a basic understanding of amorphous alloy design has led to the discovery of bulk metallic glasses (BMGs) in a variety of systems, including the Pd-, Pt-, Au-, Mg-, Zr-, Ti-, Hf-, La-, Cu-, Fe-, Co, Y-, and Ni-based systems. In addition to these alloy systems, Amiya and Inoue reported the formation of a new class of BMGs in the Ca-based system in 2002. [1,2] With the exception of the Mg-based alloys, this system is the only known nontransitionmetal-based system. To date, the numerous Ca-based bulkglass forming alloys that have been reported in the literature include Ca-Mg-Ag-Cu, [2] Ca-Al-Mg-Cu, [3] Ca-Mg-Cu, [1,4] Ca-Mg-Zn-Cu, [4] Ca-Mg-Al-Ag-Cu, [4] and Ca-Mg-Zn. [4,5] These BMG alloys are of interest because of their low densities and costs; however, few studies have examined the properties of these novel materials.In this study, the thermophysical properties of three Ca-based BMGs were examined. In addition, the electrochemical behavior was investigated and compared to a crystalline, Mg-based alloy. Cyclic-anodic polarization tests were conducted in a 0.05 M Na 2 SO 4 electrolyte, and posttest analysis with scanning electron microscopy (SEM) was conducted to assess the damage to the exposed surfaces. I. EXPERIMENTAL METHODSThree Ca-based BMG alloys, with nominal compositions of Ca 65 Mg 15 Zn 20 , Ca 55 Mg 18 Zn 11 Cu 16 , and Ca 50 Mg 20 Cu 30 (atomic percent, at. pct), were fabricated by induction melting of the pure elements (99.9 pct) in a water-cooled, copper crucible in an argon atmosphere. The prepared alloys were induction remelted in a quartz crucible with a 2-mm-diameter hole at the bottom, and the molten metal was injected through this hole into a water-cooled copper mold with a cavity of 15 mm ϫ 15 mm ϫ 4 mm. It was shown in previous work [6] that the critical thicknesses of the alloys, below which they are fully amorphous, are 6 mm for the Ca 65 Mg 15 Zn 20 (at. pct) and greater than 10 mm for the other two alloys. Therefore, it was expected that the 4-mm-thick plates produced for this study should also be fully amorphous. The amorphous state of the cast samples was verified using X-ray diffraction (XRD) and differential scanning calorimetry (DSC). For X-ray and DSC analyses, specimens were extracted from central parts of the cast plates. These specimens were ground into powders, and X-ray diffraction and DSC traces were obtained from the powdered samples. X-ray diffraction of the powdered samples was condu...

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Section: Table I Glass-transition (T G ) Crystallization (T X ) Somentioning

confidence: 99%

Electrochemical behavior of Ca-based bulk metallic glasses

Morrison

Buchanan

Liaw

et al. 2006

Metall Mater Trans A

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“…3). Strong surface segregation of iron was also observed [27] by Auger electron spectroscopy in amorphous alloys Fe 40 Ni 40 P 14 B 6 and Fe 40 Ni 40 P 16 B 4 during annealing (t a = 20 min) in the temperature range 230-280…”

Section: Discussionmentioning

confidence: 76%

XPS and ToF‐SIMS characterization of a Finemet surface: effect of heating

Chenakin

Galstyan

Tolstogouzov

et al. 2009

Surface & Interface Analysis

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X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) were used to study the surface composition and electronic structure of Finemet, Fe 73 Si 15.8 B 7.2 Cu 1 Nb 3 , in the original amorphous state and after gradual heating in vacuum to a temperature of 400• C and cooling back to room temperature. It was found that relaxation processes occurring during heat treatment well below the crystallization onset caused the physico-chemical state of Finemet surface to change irreversibly. In the relaxed alloy, the surface originally covered with the native air-formed oxide was significantly enriched with elemental iron and depleted of other alloy constituents compared with the original state. Yet in the as-quenched state, clustering of copper atoms on the Finemet surface was detected which was enhanced by heating. The thermal treatment resulted in the selective reduction of iron oxides and caused noticeable changes in the valence band structure and the Fe L 3 VV Auger spectrum associated with atomic redistribution.

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“…[64] The cyclic-anodic-polarization curves for these Ca-based BMG alloys and a Mg alloy [64] ZK60 are plotted in Figure 11. These curves show that Ca 65 SO 4 electrolyte showed CPR of 0.4 lm/year, [65] an Fe-based BMG in a 0.5 M Na 2 SO 4 electrolyte had a CPR of 927 lm/year, [66] and pure Mg in a 0.01 M Na 2 SO 4 electrolyte had~1000 lm/year. [67] Based upon all of these comparisons, it seems that the electrochemical corrosion resistances of Ca-Mg-Zn-Cu and Ca-Mg-Cu glassy alloys are comparable to some Fe-based BMGs and Mg-based crystalline alloys.…”

Section: Compression Propertiesmentioning

confidence: 93%

Development and Characterization of Low-Density Ca-Based Bulk Metallic Glasses: An Overview

Senkov

Miracle

Keppens

et al. 2007

Metall Mater Trans A

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Ca-based bulk metallic glasses (BMGs) have unique properties and represent a new seventh group of BMGs. Many of them have excellent GFA, which can be related to their efficient atomic packing, low onset driving force for crystallization, and high viscosity (high relaxation time) of the supercooled liquid. The Ca-based glasses have the lowest density and elastic moduli among all BMGs discovered to date. Unfortunately, as many other glasses, Ca-based BMGs are brittle below the glass transition temperature, and they also have marginal oxidation and corrosion resistance. The latter can be improved by proper selection of alloying elements. In this article, we review recent work on the development of low-density Ca-based BMGs and discuss the effect of alloy composition on the thermal, physical, and chemical properties of these glasses.

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Electrochemical corrosion and its influence on magnetic properties of Fe75.5Si13.5B9Nb3Cu1 alloy

Cited by 27 publications

References 12 publications

Electrochemical behavior of Ca-based bulk metallic glasses

Electrochemical behavior of Ca-based bulk metallic glasses

XPS and ToF‐SIMS characterization of a Finemet surface: effect of heating

Development and Characterization of Low-Density Ca-Based Bulk Metallic Glasses: An Overview

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