Journal
ACTA METALLURGICA SINICA-ENGLISH LETTERS
Volume 35, Issue 1, Pages 103-114Publisher
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-021-01304-3
Keywords
Bulk metallic glass; Crystallization kinetics; Synchrotron and neutron scattering; Phase separation
Categories
Funding
- National Natural Science Foundation of China [51871120, 51571170]
- Natural Science Foundation of Jiangsu Province [BK20200019]
- Fundamental Research Funds for the Central Universities [30919011107, 30919011404]
- Shenzhen Key Project for Basic Research [JCYJ20200109105618137]
- Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology [2019B121205003]
- DOE Office of Science [DE-AC02-06CH11357]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy [DE-AC05-00OR22725]
- Oak Ridge National Laboratory
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The study revealed that the Zr-Cu-Fe-Al bulk metallic glass with excellent glass-forming ability exhibits a two-step crystallization behavior, with complex crystalline products. The strength and plasticity of the composite containing cubic Zr2Cu phase and glass matrix increase compared to the original as-cast glass. This research may contribute to the synthesis of high-strength and high-plasticity bulk-sized glass-nanocrystals composites.
Thermal stability and the crystallization kinetics of a phase-separated Zr-Cu-Fe-Al bulk metallic glass were investigated using in situ high-energy synchrotron X-ray and neutron diffraction, as well as small-angle synchrotron X-ray scattering. It was revealed that this glass with excellent glass-forming ability possesses a two-step crystallization behavior. The crystalline products and their evolution sequence are more complicated than a homogeneous Zr-Cu-Al glass with average glass-forming ability. The experimental results indicate that a finely distributed nanometer-sized cubic Zr2Cu phase forms first and then transforms to a tetragonal Zr2Cu phase, while the matrix transforms to an orthorhombic Zr3Fe phase. The strength of the Zr-Cu-Fe-Al composite containing cubic Zr2Cu phase and glass matrix increases, and the plasticity also improves compared to the as-cast Zr-Cu-Fe-Al bulk metallic glass. Our results suggest that the formation of multiple and complex crystalline products would be the characteristics of the Zr-Cu-Fe-Al glass with better glass-forming ability. Our study may shed light on the synthesis of bulk-sized glass-nanocrystals composites of high strength and good plasticity.
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