Preparation of High-Density Nanocrystalline Bulk Selenium by Rapid Compressing of Melt
HU Yun1, SU Lei1,2, LIU Xiu-Ru1, SUN Zhen-Ya3, LV Shi-Jie1, YUAN Chao-Sheng1, JIA Ru1, SHEN Ru1, HONG Shi-Ming1
1Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031 2Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002 3Center for Materials Research and Testing, Wuhan University of Technology, Wuhan 430070
Preparation of High-Density Nanocrystalline Bulk Selenium by Rapid Compressing of Melt
HU Yun1, SU Lei1,2, LIU Xiu-Ru1, SUN Zhen-Ya3, LV Shi-Jie1, YUAN Chao-Sheng1, JIA Ru1, SHEN Ru1, HONG Shi-Ming1
1Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031 2Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002 3Center for Materials Research and Testing, Wuhan University of Technology, Wuhan 430070
摘要The melt's solidification behavior of elemental selenium is investigated by a series of experiments including rapid compressing to 2.8 and 3.5 GPa within 20ms respectively, slow compressing to 2.8 GPa for 20 min and natural cooling at ambient pressure. Based on the x-ray diffraction, scanning electron microscope and transmission electron microscope results of the recovered samples, it is clearly shown that homogenous nanostructures are formed only by the rapid compression processes, and that the average crystal sizes are about 18.7 and 19.0 nm in the samples recovered from 2.8 and 3.5 GPa, respectively. The relative density of the nanocrystalline bulk reaches 98.17% of the theoretical value. It is suggested that rapid compression could induce pervasive nucleation and restrain grain growth during the solidification, which is related to fast supercooling, higher viscosity of the melt and lower diffusivity of atoms under high pressure.
Abstract：The melt's solidification behavior of elemental selenium is investigated by a series of experiments including rapid compressing to 2.8 and 3.5 GPa within 20ms respectively, slow compressing to 2.8 GPa for 20 min and natural cooling at ambient pressure. Based on the x-ray diffraction, scanning electron microscope and transmission electron microscope results of the recovered samples, it is clearly shown that homogenous nanostructures are formed only by the rapid compression processes, and that the average crystal sizes are about 18.7 and 19.0 nm in the samples recovered from 2.8 and 3.5 GPa, respectively. The relative density of the nanocrystalline bulk reaches 98.17% of the theoretical value. It is suggested that rapid compression could induce pervasive nucleation and restrain grain growth during the solidification, which is related to fast supercooling, higher viscosity of the melt and lower diffusivity of atoms under high pressure.
(Specific materials: fabrication, treatment, testing, and analysis)
引用本文:
HU Yun;SU Lei;LIU Xiu-Ru;SUN Zhen-Ya;LV Shi-Jie;YUAN Chao-Sheng;JIA Ru;SHEN Ru;HONG Shi-Ming. Preparation of High-Density Nanocrystalline Bulk Selenium by Rapid Compressing of Melt[J]. 中国物理快报, 2010, 27(3): 38101-038101.
HU Yun, SU Lei, LIU Xiu-Ru, SUN Zhen-Ya, LV Shi-Jie, YUAN Chao-Sheng, JIA Ru, SHEN Ru, HONG Shi-Ming. Preparation of High-Density Nanocrystalline Bulk Selenium by Rapid Compressing of Melt. Chin. Phys. Lett., 2010, 27(3): 38101-038101.
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