摘要
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 Zr_(2)Cu phase forms first and then transforms to a tetragonal Zr_(2)Cu phase,while the matrix transforms to an orthorhombic Zr_(3)Fe phase.The strength of the Zr-Cu-Fe-Al composite containing cubic Zr_(2)Cu 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.
基金
supported by the National Natural Science Foundation of China(Grant Nos.51871120,51571170)
the Natural Science Foundation of Jiangsu Province(Grant No.BK20200019)
the Fundamental Research Funds for the Central Universities(Grant Nos.30919011107 and 30919011404)
the Shenzhen Key Project for Basic Research(Grant No.JCYJ20200109105618137)
the Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology(Grant No.2019B121205003)。
