Isothermal crystallization kinetics of Fe75Cr5P9B4C7 metallic glass with cost-effectiveness and desirable merits

Nonisothermal crystallization kinetics of Cr‐rich metallic glass Cr29.4Fe29.4Mo14.7C14.7B9.8Y2 with desirable properties

“…Figure 4 shows the plots of the crystallized volume fraction ( x ) versus the temperature ( T ) for the first crystallization peak of Cr 29.4 Fe 29.4 Mo 14.7 C 14.7 B 9.8 Y 2 MG. It is shown that the five plots exhibit representative sigmoid characteristic, indicating a tendency of gradual increase at the beginning, then distinct rise and gradual slowness at last, which is similar with that for other MGs at nonisothermal crystallization conditions 15–19,24–34,41,42 . Based on the results in Figure 4, the crystallized volume fraction ( x ) and the corresponding temperature T ( x ) for the first crystallization peak of the present MG can be obtained.…”

“…Rezaei‐Shahreza et al 54 reported that, in the Fe‐based bulk amorphous alloy Fe 41 Co 7 Cr 15 Mo 14 Y 2 C 15 B 6 (which can be expected as a similar MG system with the present Cr 29.4 Fe 29.4 Mo 14.7 C 14.7 B 9.8 Y 2 MG) with four crystallization peaks on its DSC curve, the E values for all of these four crystallization peaks obtained by means of FWO (which is another conventional abbreviation for denoting the OFW approach) and KAS were not only in good agreement with each other but also in good agreement with activation energies of the recrystallization process calculated by the Starink isoconversional method. Meanwhile, it was reported that, 32 in the Fe‐Cr‐P‐B‐C MG with three crystallization peaks on its DSC curve, the E ( x ) for its first crystallization peak calculated by KAS and OFW methods were not only similar with each other but also consistent with the results of n ( x ). Additionally, it exhibits that the E ( x ) for the first crystallization peak calculated by KAS and OFW methods are comparable to each other in a Cu‐Zr‐Ti MG with three crystallization peaks on its DSC curve, 55 from which the valid crystallization trend for the alloy can be determined.…”

“…It has been proved that the KAS and OFW methods are valid for determining the E ( x ) of MGs with various crystallization peaks or crystallization events, which are favorable for pointing out the difficulty of the crystallization trend and calculating available local Avrami exponent n ( x ) (a significant nonisothermal crystallization kinetics parameter for estimating the characteristic of nucleation and growth during the crystallization process) 19,24,32,54,55 . Rezaei‐Shahreza et al 54 reported that, in the Fe‐based bulk amorphous alloy Fe 41 Co 7 Cr 15 Mo 14 Y 2 C 15 B 6 (which can be expected as a similar MG system with the present Cr 29.4 Fe 29.4 Mo 14.7 C 14.7 B 9.8 Y 2 MG) with four crystallization peaks on its DSC curve, the E values for all of these four crystallization peaks obtained by means of FWO (which is another conventional abbreviation for denoting the OFW approach) and KAS were not only in good agreement with each other but also in good agreement with activation energies of the recrystallization process calculated by the Starink isoconversional method.…”

“…However, it is unavoidable that MGs will change into the corresponding crystalline counterparts for their metastable nature and this can be enhanced with increasing temperatures, which exhibits noticeable effects on their structures and properties 15–19 . Therefore, it is essential to investigate the crystallization behaviors and crystallization kinetics of MGs at various heating conditions, which is significant for tuning the structures and properties of MGs 15–40 . Among them, the nonisothermal crystallization behaviors and crystallization kinetics for MGs with various compositions, that is, multicomponent Zr‐Cu‐Fe‐Al MG, 15 Fe‐Co‐Cr‐Ni‐Zr MG, 16 Zr‐(CuAg)‐Al MG, 17 Fe‐Ni‐P‐B MG, 18 Zr‐Co‐Al‐Cu MG, 24 Fe‐Ni‐Mo‐P‐C‐B‐Cu MG, 25 Ti‐Zr‐Ni‐Cu‐Be MG, 26 Co‐Fe‐Ta‐B MG, 29 Ni‐Nb‐Ti‐Zr‐Co‐Ta MG, 31 Fe‐Cr‐P‐C‐B MG, 32 and Fe‐Co‐Cr‐Mo‐Y‐C‐B MG 33 ; ternary U‐Co‐Al MG, 19 La‐Al‐Co MG, 27 Zr‐Al‐Fe MG, 30 Zr‐Co‐Al MGs, 24,35 Fe‐P‐C MG, 36 Fe‐B‐C MG, 37 La‐Al‐Ni MG, 38 and Pd‐Ni‐P MG 39 ; and binary Cu‐Zr MG, 40 have been extensively researched by Kissinger, Ozawa, Kissinger‐Akahira‐Sunose (KAS), Ozawa‐Flynn‐Wall (OFW), and Vogel‐Fulcher‐Tammann (VFT) approaches using differential scanning calorimeter (DSC).…”

“…Consequently, it is considered as promising corrosion/wear resistance coating materials to enrich the potential application of MGs 5 . Nevertheless, the current researches of the crystallization kinetics for Cr‐bearing MGs are preferred for MGs with low content (< 20 at.%) of Cr, 16,23,32–34,41,42 and the crystallization kinetics of Cr‐containing MGs with high content (>20 at.%) of Cr such as the present Cr‐rich MG Cr 29.4 Fe 29.4 Mo 14.7 C 14.7 B 9.8 Y 2 has not been referred, which is severely unfavorable for comprehending the formation and tuning the structures and properties of these MGs.…”