A geometry model of field evaporation process is set up;with this model the field evaporation process can be described as Markov process.Its application to the earliest stage of phase transition is studied.For compari...A geometry model of field evaporation process is set up;with this model the field evaporation process can be described as Markov process.Its application to the earliest stage of phase transition is studied.For comparison,Camus’system Fe-Cr 45 at.%is calculated again,and the same result is extracted from our method and intimated in our experimental data.展开更多
Hydrogen adsorption and diffusion on the surface of austenitic stainless steel are studied with atom probe field ion microscope(AP-FIM).Hydrogen is noticeably adsorbed on the surface at low temperature(85K)and diffuse...Hydrogen adsorption and diffusion on the surface of austenitic stainless steel are studied with atom probe field ion microscope(AP-FIM).Hydrogen is noticeably adsorbed on the surface at low temperature(85K)and diffuses into the bulk to a depth of about 40 atom layers.The diffusion activation energy is calculated to be 0.22eV(or 21.2KJ/mol).It is also found that the microstructure of a specimen charged with hydrogen is changed,and the distribution of hydrogen fluctuates with the depth.展开更多
文摘A geometry model of field evaporation process is set up;with this model the field evaporation process can be described as Markov process.Its application to the earliest stage of phase transition is studied.For comparison,Camus’system Fe-Cr 45 at.%is calculated again,and the same result is extracted from our method and intimated in our experimental data.
基金Project supported by the National Science Foundstion of China.
文摘Hydrogen adsorption and diffusion on the surface of austenitic stainless steel are studied with atom probe field ion microscope(AP-FIM).Hydrogen is noticeably adsorbed on the surface at low temperature(85K)and diffuses into the bulk to a depth of about 40 atom layers.The diffusion activation energy is calculated to be 0.22eV(or 21.2KJ/mol).It is also found that the microstructure of a specimen charged with hydrogen is changed,and the distribution of hydrogen fluctuates with the depth.
