Phase Separation and Crystallization Induced by Electron Irradiation in Nanoscale Fe_(56.5)Mn_(11)Cr

• 作 者: Xiao-Yang Chen Shu-Guang Zhang Ming-Xu Xia Jian-Guo Li
• 机 构: School of Materials Science and Engineering,Shanghai Jiao Tong University,
• 出 处: Acta Metallurgica Sinica(English Letters)
• 发表日期: 2015年11期
• 关键词: irradiation metallic Electron glasses irradiated decomposed amorphous hierarchic

A nanoscale Fe_(56.5)Mn_(11)Cr_(8.5)Ni_4Si_(10)C_(10) metallic glass was irradiated by electron beam in a 200 kV transmission electron microscope.Structure evolution in the metallic glass was investigated in situ during continuous irradiation,where phase separation was observed after irradiation for 5 min and crystallization was observed after 33.5 min.Based on the analysis of irradiation effect,atomic displacement is believed to be the main reason for the structure rearrangement.Accumulation of atomic displacement increases the energy of the sample and promotes atomic diffusion during transformation.On the other hand,the large specific surface area of the sample also contributes to increasing free energy and atomic diffusion.

A nanoscale Fe_ (56.5) Mn_ (11) Cr_ (8.5) Ni_4Si_ (10) C_ (10) metallic glass was irradiated by electron beam in a 200 kV transmission electron microscope. Structure evolution in the metallic glass was investigated in situ during continuous irradiation , where phase separation was observed after irradiation for 5 min and the crystallization was observed after 33.5 min. Based on the analysis of irradiation effect, atomic displacement is believed to be be the main reason for the structure rearrangement. Accccumulation of atomic displacement increases the energy of the sample and promotes atomic diffusion during transformation. On the other hand, the large specific surface area of ​​the sample also contributes to increasing free energy and atomic diffusion.