Kinetics of glass transition of La65Al20Co15 metallic glass

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.…”

“…It can be seen that all the DSC curves show representative characteristics of glass transition, supercooled liquid region and following distinct crystallization exothermic peaks, which further proves the amorphous nature of the present MG. Additionally, it exhibits that the characteristic temperatures ( T g , T x , and the peak temperature ( T p )) increase and the Δ T x widens as the heating rate increases, implying that glass transition and crystallization are dependent on the heating rates during the current nonisothermal crystallization. It is noted that the present T g is defined as the onset temperature of the glass transition from the intersection of the extrapolated straight line of initial change in the baseline slope of the glass transition region, which was illustrated in detail in some other investigations for MGs 27,43–45 . Values for T g , T x , T p , and Δ T x of Cr 29.4 Fe 29.4 Mo 14.7 C 14.7 B 9.8 Y 2 MG are listed in Table 1.…”

“…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).…”

“…[15][16][17][18][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. 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). Under nonisothermal crystallization conditions, MGs were continuously heated up to complete crystallization by different heating rates.…”

Tuning isothermal crystallization kinetics by minor similar solute element substitution in novel La‐(AlGa)‐C metallic glasses

“…Generally, the crystallization behaviors and crystallization kinetics under different conditions for diverse compositions, that is, binary Zr‐Ni MG, 19 Cu‐Zr MGs, 20,21 and Ni‐Nb MGs 22,23 ; ternary Dy‐Co‐Al MG, 24 U‐Co‐Al MG, 25 La‐Al‐Co MG, 26 Zr‐Al‐Fe MG, 15 Zr‐Co‐Al MGs, 8,27 Fe‐P‐C MG, 18 Fe‐B‐C MG, 28 La‐Al‐Ni MG, 4 and Pd‐Ni‐P MG, 29 ; quaternary Zr‐Cu‐Fe‐Al MG, 30 Zr‐(CuAg)‐Al MG, 7 Fe‐Ni‐P‐B MG, 31 Zr‐Co‐Al‐Cu MG, 27 and Co‐Fe‐Ta‐B MG 13 ; and multicomponent Fe‐Co‐Cr‐Ni‐Zr MG, 6 Fe‐Ni‐Mo‐P‐C‐B‐Cu MG, 32 Ti‐Zr‐Ni‐Cu‐Be MG, 33 Ni‐Nb‐Ti‐Zr‐Co‐Ta MG, 34 Fe‐Cr‐P‐C‐B MG, 17 and Fe‐Co‐Cr‐Mo‐Y‐C‐B MG 35 have been comprehensively investigated. Among these reported investigations, the crystallization kinetics of MGs at the isothermal annealing conditions have been primarily studied 12–17 .…”