TEM INVESTIGATION ON CRYSTALLIZATION BEHAVIOR OF A Fe68C10.5Si4.4B6.5P8.6Al2 BULK METALLIC GLASS

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1223-1228
Author(s):  
KI BUEM KIM ◽  
HONG XIANG LI ◽  
SEONGHOON YI
Keyword(s):  
Heat Treatment ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Crystallization Behavior ◽  
Amorphous Matrix ◽  
Treatment Time ◽  
Annealing Treatment ◽  
Primary Crystallization ◽  
Heat Treatment Time ◽  
Nano Scale

TEM investigations on crystallization behavior of a Fe 68 C 10.5 Si 4.4 B 6.5 P 8.6 Al 2 bulk metallic glass reveals that the nano-scale fcc Fe phase formed by primary crystallization is homogeneously embedded in the amorphous matrix after heat treatment at 783 K for 30 min. With increasing heat treatment time (783 K for 45 min), a tetragonal Fe 3( C , B , P ) phase encapsulates the primary fcc Fe phase suppressing the growth of the fcc Fe phase. The Fe 3( C , B , P ) phase decomposes into a mixture of orthorhombic Fe 3( C , P ) and tetragonal Fe 3( B , P ) upon further annealing treatment at 783K.

scholarly journals Crystallization behavior of Zr62Al8Ni13Cu17 Metallic Glass

2017 ◽  
Vol 62 (2) ◽  
pp. 1023-1026 ◽  
Author(s):  
Mi Sun Jo ◽  
Jin Kyu Lee
Keyword(s):  
Metallic Glass ◽  
Crystalline Phase ◽  
Crystallization Behavior ◽  
Amorphous Matrix ◽  
Primary Crystallization ◽  
Isothermal Transformation ◽  
Avrami Analysis ◽  
Diffusion Controlled ◽  
Residual Amorphous Matrix ◽  
Glass Alloy

AbstractThe crystallization behavior has been studied in Zr62Al8Ni13Cu17metallic glass alloy. The Zr62Al8Ni13Cu17metallic glass crystallized through two steps. The fcc Zr2Ni phase transformed from the amorphous matrix during first crystallization and then the Zr2Ni and residual amorphous matrix transformed into a mixture of tetragonal Zr2Cu and hexagonal Zr6Al2Ni phases. Johnson-Mehl-Avrami analysis of isothermal transformation data suggested that the formation of crystalline phase is primary crystallization by diffusion-controlled growth.

Influence of sub-Tg annealing on microstructure and crystallization behavior of TiZr-based bulk metallic glass

2021 ◽  
Vol 565 ◽  
pp. 120855
Author(s):  
J.W. Lv ◽  
D.W. Yin ◽  
F.L. Wang ◽  
Y.J. Yang ◽  
M.Z. Ma ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Crystallization Behavior

NANOSCALE DIMPLES AND PERIODIC CORRUGATIONS ON FRACTURE SURFACE OF Zr-BASED BULK METALLIC GLASS COMPOSITE

2019 ◽  
Vol 26 (08) ◽  
pp. 1950037
Author(s):  
BO SHI ◽  
SHIYU LUAN ◽  
PEIPENG JIN
Keyword(s):  
Fracture Surface ◽  
Metallic Glass ◽  
Cooling Rate ◽  
Bulk Metallic Glass ◽  
Crystallization Behavior ◽  
Glass Composite ◽  
Bulk Metallic Glass Composite

Nanoscale dimples and periodic corrugations are observed on the fracture surface of Zr-based bulk metallic glass composite (BMGC). The nanoscale periodic corrugations display a curved shape, which is different from that observed in previous works. In addition, the crystallization behavior of [Formula: see text][Formula: see text][Formula: see text][Formula: see text] BMG was investigated. The second crystallization event of Zr-Cu-Ni-Al BMG can be controlled by annealing or tuning cooling rate. The in situ Zr-based BMGC was prepared via lowering cooling rate. The Zr-based BMGC displays completely brittleness.

Crystallization Behavior of Heat-Affected Zone by Laser Remelting Bulk Metallic Glass Zr55Al10Ni5Cu30

2010 ◽  
Vol 37 (8) ◽  
pp. 2104-2110 ◽  
Author(s):  
刘伟伟 Liu Weiwei ◽  
林鑫 Lin Xin ◽  
杨高林 Yang Gaolin ◽  
杨海欧 Yang Hai′ou ◽  
黄卫东 Huang Weidong ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Heat Affected Zone ◽  
Crystallization Behavior ◽  
Laser Remelting

Low-temperature thermal pretreatment process for recycling inner core of spent lithium iron phosphate batteries

2020 ◽  
pp. 0734242X2095740
Author(s):  
Haijun Bi ◽  
Huabing Zhu ◽  
Lei Zu ◽  
Yong Gao ◽  
Song Gao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Heat Treatment Temperature ◽  
Lithium Iron Phosphate ◽  
Inner Core ◽  
Treatment Time ◽  
Iron Phosphate ◽  
Treatment Temperature ◽  
Heat Treatment Time ◽  
Physicochemical Changes

Spent lithium iron phosphate (LFP) batteries contain abundant strategic lithium resources and are thus considered attractive secondary lithium sources. However, these batteries may contaminate the environment because they contain hazardous materials. In this work, a novel process involving low-temperature heat treatment is used as an alternative pretreatment method for recycling spent LFP batteries. When the temperature reaches 300°C, the dissociation effect of the anode material gradually improves with heat treatment time. At the heat treatment time of 120 minutes, an electrode material can be dissociated. The extension of heat treatment time has a minimal effect on quality loss. The physicochemical changes in thermally treated solid cathode and anode materials are examined through scanning electron microscopy with energy-dispersive X-ray spectroscopy. The heat treatment results in the complete separation of the materials from aluminium foil without contamination. The change in heat treatment temperature has a small effect on the quality of LFP material shedding. When the heat treatment temperature reaches 300°C and the time reaches 120 minutes, heat treatment time increases, and the yield of each particle size is stable and basically unchanged. The method can be scaled up and may reduce environmental pollution due to waste LFP batteries.

Sign in / Sign up

Export Citation Format

Share Document