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Acta Metall Sin  2026, Vol. 62 Issue (3): 458-466    DOI: 10.11900/0412.1961.2024.00168
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Effect of Chromium on Thermal Stability and Corrosion Resistance in FeWB Bulk Metallic Glasses
XIAO Siming1, LIU Tianhao2, SU Chen1, GUO Shengfeng1()
1.School of Materials and Energy, Southwest University, Chongqing 400715, China
2.Chongqing Chuanyi Automation Co. Ltd., Chongqing 401121, China
Cite this article: 

XIAO Siming, LIU Tianhao, SU Chen, GUO Shengfeng. Effect of Chromium on Thermal Stability and Corrosion Resistance in FeWB Bulk Metallic Glasses. Acta Metall Sin, 2026, 62(3): 458-466.

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Abstract  

Bulk metallic glasses are thermodynamically metastable alloys with an amorphous structure that becomes increasingly unstable at temperatures above their glass transition temperature, leading to degradation of their advantageous properties. Thus, enhancing the thermal stability of bulk metallic glasses is critical for preserving their exceptional characteristics. Recently, our team successfully synthesized a Fe59W23B18 (atomic fraction, %) bulk metallic glass that exhibits high thermal stability and further developed a series of (Fe1 - x Cr x )59W23B18 (x = 0, 0.05, 0.1, 0.15, 0.2, 0.25) bulk metallic glasses by incorporating Cr in this study. Results show that Cr addition notably enhanced the thermal stability of FeWB bulk metallic glasses, with (Fe0.9Cr0.1)59W23B18 achieving a glass transition temperature of 954 K and an crystallization onset temperature of 994 K. This substantial increase in thermal stability is primarily attributed to Cr playing a role in the formation of strong metal-metalloid covalent bonds (Cr—B bonds), which enhance interatomic interactions. Additionally, the substantial presence of an Fe23B6-like medium-range order structure further stabilized the system. Furthermore, the corrosion resistance of the FeWB bulk metallic glass system was considerably improved by Cr addition, as indicated by an approximately 10-fold reduction in the corrosion current density. This enhancement can be primarily attributed to the formation of a dense Cr2O3 passivation layer on the alloy surface. However, the reduced pitting potential of Cr2O3 relative to WO3 led to a slight decrease in the pitting corrosion resistance of the FeCrWB alloys.

Key words:  Fe-based bulk metallic glass      thermal stability      corrosion resistance     
Received:  17 May 2024     
ZTFLH:  TG113.2  
Fund: National Natural Science Foundation of China(52071276)
Corresponding Authors:  GUO Shengfeng, professor, Tel: 13500330725, E-mail: sfguo@swu.edu.cn

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2024.00168     OR     https://www.ams.org.cn/EN/Y2026/V62/I3/458

Fig.1  XRD patterns of (Fe1 - x Cr x )59W23B18 (x = 0, 0.05, 0.1, 0.15, 0.2, and 0.25; atomic fraction, %. The corresponding samples are marked by Cr0, Cr0.05, Cr0.1, Cr0.15, Cr0.2, and Cr0.25, respectively) alloy rods with 1 mm diameter (a, b); backscattered electron image (c) and HRTEM image and selected area electron diffraction pattern (inset) (d) of Cr0.1 alloy rod
Fig.2  XRD patterns of Cr0 and Cr0.05 alloy rods with 1.5 mm diameter
Fig.3  DTA curves of FeCrWB alloys with different Cr contents (a), and the Tg and Tx of typical Fe-based bulk metallic glasses (BMGs) previously report-ed[11,20-36] (b) (Tg—glass transition temperature, Tx—crystallization onset temperature)
AlloyTg / KTx / KΔTx / KHv / HV
Cr0923974511381 ± 13
Cr0.05938987491410 ± 20
Cr0.1954994401514 ± 17
Table 1  Thermal stability parameters and microhardnesses of FeCrWB alloys with different Cr contents
Fig.4  Microhardnesses of different Fe-based BM-Gs[9,11,33,36,37,39-42] (a), and the relationship between Tg3/2 / Vm and σ of different metallic glasses[43,44] (b) (Vm—molar volume of alloy, σ—fracture strength, C0—constant)
Fig.5  Nyquist plots (Inset is a locally enlarged riew) (a), Bode phase plots (b), Bode plots (c), and equivalent circuit diagram (d) of FeCrWB alloys in 3.5%NaCl solution (Z'—real part of impedance; Z"—imaginary part of impedance; |Z|—modulus of impedance; R1—solution resistance; R2—charge transfer resistance; R3—passive film resistance; Ws—Weber resistance; CPE, CPE1, and CPE2—constant phase elements)
AlloyEcorrVicorrA·cm-2R2Ω·cm2R3Ω·cm2WsΩ·cm2

Cr0

Cr0.05

Cr0.1

Cr0.15

-0.76

-0.66

-0.47

-0.41

3.06 × 10-5

1.25 × 10-5

7.52 × 10-6

3.91 × 10-6

451.54

840.92

3621.90

1200.40

-

-

-

14638

1955

1918

10182

-

Table 2  Electrochemical corrosion properties of FeCrWB alloys with different Cr in 3.5%NaCl solution
Fig.6  Potentiodynamic polarization curves of FeCrWB alloys with different Cr contents in 3.5%NaCl solution (a); plots of current density and time (b), double-lg plots of current density and time (c), and the correlation between space charge capacitance (C) and potential (E) of Cr0 and Cr0.1 alloys (d) (k—slope)
Fig.7  XPS of W4f of the passive films formed on the Cr0 (a) and Cr0.1 (b) alloys
Fig.8  Pitting potentials and passivation intervals of typical Fe-based metallic glasses and 316L stainless steel in 3.5%NaCl[42,49-52]
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