Crystallization kinetics of the Fe40Ni40P14B6 metallic glass in an extended range of heating rates

Эффективные коэффициенты диффузии и термическая устойчивость структуры металлического стекла Fe-=SUB=-48-=/SUB=-Co-=SUB=-32-=/SUB=-P-=SUB=-14-=/SUB=-B-=SUB=-6-=/SUB=-

“…где H m и T m -молярная теплота и температура плавления соответственно. Корректность простого соотношения (2) была подтверждена в ряде работ (напр., [18]) и оно использовалось в работах [12,13] [1]. Плотность кристаллтов оценивалась из соотношения N ons = 6X ons /(πL 3 ons ), а размер колонии, линейно растущей в условиях нагрева, определялся как L ons = 2U(T ons )t eff (T ons ), где t eff (T ons ) = T 2 ons /(qQ)эффективное время диффузионно-контролируемого процесса с энергией активации Q при нагреве со скоростью q [21].…”

“…Однако во многих МС рост кристаллов происходит по эвтектическому или полиморфному механизмам (линейный рост), скорость которого контролируется диффузией на межфазной границе [9]. Очевидно, что природа эффективных коэффициентов диффузии, входящих в уравнения эвтектического роста кристаллов, отличается от природы коэффициентов, контролирующих рост первичных кристаллов, хотя принципы оценки их значений по скорости роста [10], структуре закристаллизованных образцов [11,12] или изменениям доли закристаллизованного объема [13] аналогичны.…”

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

“…As a promising type of advanced materials, Cr‐bearing metallic glasses (MGs) have gained extensive attentions attributing to the combination of attractive properties, that is, remarkable corrosion resistance, high thermal stability, high strength, high hardness, and wear resistance, which makes them as prospective materials for scientific investigations and engineering applications 1–14 . 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 .…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] 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][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 differenti...…”

“…[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.…”