Isothermal nanocrystallization behavior of bulk metallic glass composites in supercooled liquid region

Bulk metallic glass composites （BMGCs） reinforced by micro- （spherical size of about 10 gin） and nano-sized （20-50 nm） A13Zr crystals were synthesized by copper mold suction casting method. The isothermal crystallization of Cu4oZr44AgsAls BMGCs in the super- cooled liquid region was studied by diffe...

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Bibliographic Details
Published inRare metals Vol. 36; no. 11; pp. 919 - 924
Main Authors Zhang, Xiang-Yun, Yuan, Zi-Zhou, Feng, Xue-Lei, Cui, Li-Zhi, Li, Duan-Xian
Format Journal Article
LanguageEnglish
Published Beijing Nonferrous Metals Society of China 01.11.2017
Springer Nature B.V
Subjects
Amorphous materials
Biomaterials
Chemistry and Materials Science
Crystal structure
Crystallization
Energy
Isothermal annealing
Isothermal treatment
Materials Engineering
Materials Science
Mechanical properties
Metallic glasses
Metallic Materials
Microscopy
Nanocrystals
Nanoscale Science and Technology
Particulate composites
Phases
Physical Chemistry
Suction
Synthesis
Heat treatment
Composite
Bulk metallic glasses
Thermal stability
Crystallization
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Summary:Bulk metallic glass composites （BMGCs） reinforced by micro- （spherical size of about 10 gin） and nano-sized （20-50 nm） A13Zr crystals were synthesized by copper mold suction casting method. The isothermal crystallization of Cu4oZr44AgsAls BMGCs in the super- cooled liquid region was studied by differential scanning calorimeter （DSC）, X-ray diffractometer （XRD）, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The mechanisms for nucleation and growth of the crystalline phases precipitated in two-stage crystallization process and the effect of the isothermal treatment on the in situ crystalline phases were discussed. Results show that the BMGCs experience a primary crys- tallization process. Nano-sized A13Zr and Cul0Zr7 phases precipitate from the amorphous matrix successively. Fur- thermore, isothermal annealing has no effect on the pre- existing particles in the as-cast sample, which creates a new method to synthesize BMGCs strengthened by duplex crystalline phases with a large size difference. And the reinforced phase could also be dominated with intention if the as-cast BMGCs preparation and isothermal treatment process can be controlled more accurately.
Bibliography:Composite; Bulk metallic glasses; Thermalstability; Heat treatment; Crystallization
Bulk metallic glass composites （BMGCs） reinforced by micro- （spherical size of about 10 gin） and nano-sized （20-50 nm） A13Zr crystals were synthesized by copper mold suction casting method. The isothermal crystallization of Cu4oZr44AgsAls BMGCs in the super- cooled liquid region was studied by differential scanning calorimeter （DSC）, X-ray diffractometer （XRD）, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The mechanisms for nucleation and growth of the crystalline phases precipitated in two-stage crystallization process and the effect of the isothermal treatment on the in situ crystalline phases were discussed. Results show that the BMGCs experience a primary crys- tallization process. Nano-sized A13Zr and Cul0Zr7 phases precipitate from the amorphous matrix successively. Fur- thermore, isothermal annealing has no effect on the pre- existing particles in the as-cast sample, which creates a new method to synthesize BMGCs strengthened by duplex crystalline phases with a large size difference. And the reinforced phase could also be dominated with intention if the as-cast BMGCs preparation and isothermal treatment process can be controlled more accurately.
11-2112/TF
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-014-0358-4