Deformation Behavior of the Zr53.5Cu26.5Ni5Al12Ag3 Bulk Metallic Glass Over a Wide Range of Strain Rate and Temperatures
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第9期
论文作者：Guangcai Ma Zhengwang Zhu Haifeng Zhang
文章页码：941 - 945
摘 要：The stress–strain relations for the Zr53.5Cu26.5Ni5Al12Ag3 bulk metallic glass（BMG） over a broad range of temperatures（room temperature to its supercooled liquid region） and strain rates（10-4to 10-1s-1） were established in uniaxial compression using a thermal-mechanical simulation system. The superplastic flow was seen above its glass transition temperature（Tg = 694 K） and strain rates of up to 10-1s-1from the variation of stress–strain curves. A deformation map of strain rate vs temperature of Zr53.5Cu26.5Ni5Al12Ag3 was obtained, which was mainly composed of homogeneous and inhomogeneous deformation regions,the former featuring either Newtonian or non-Newtonian flow while the latter characterizing linear elastic behavior followed by shear localization, respectively. A phenomenological constitutive equation used to describe a master curve of viscosity with respect to the strain rate was obtained by fitting the experimental results, which determines the viscosity of the present alloy at the temperature near and above Tg. The results show the Zr53.5Cu26.5Ni5Al12Ag3 BMG is the subject suitable for net shape forming process at the supercooled liquid region.
Guangcai Ma1，Zhengwang Zhu1，Haifeng Zhang1
1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
摘 要：The stress–strain relations for the Zr53.5Cu26.5Ni5Al12Ag3 bulk metallic glass（BMG） over a broad range of temperatures（room temperature to its supercooled liquid region） and strain rates（10-4to 10-1s-1） were established in uniaxial compression using a thermal-mechanical simulation system. The superplastic flow was seen above its glass transition temperature（Tg = 694 K） and strain rates of up to 10-1s-1from the variation of stress–strain curves. A deformation map of strain rate vs temperature of Zr53.5Cu26.5Ni5Al12Ag3 was obtained, which was mainly composed of homogeneous and inhomogeneous deformation regions,the former featuring either Newtonian or non-Newtonian flow while the latter characterizing linear elastic behavior followed by shear localization, respectively. A phenomenological constitutive equation used to describe a master curve of viscosity with respect to the strain rate was obtained by fitting the experimental results, which determines the viscosity of the present alloy at the temperature near and above Tg. The results show the Zr53.5Cu26.5Ni5Al12Ag3 BMG is the subject suitable for net shape forming process at the supercooled liquid region.
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