EFFECTS OF SPECIMEN SHAPE, SIZE AND INITIAL OCCUPANCY ON THE THERMAL DESORPTION SPECTRUM OF HYDROGEN

摘要：

　　Thermal desorption spectrum(TDS)of hydrogen in the plate,cylindrical and spherical specimens are simulated varying specimen size,ramp rate and initial hydrogen occupancy by McNabb-Foster equations.There are two modes for hydrogen desorption.One is termed as detrapping-controlled desorption,and the other is termed as diffusion-controlled desorption.In detrapping-controlled desorption,specimen shape and size and initial occupancy have no effects on TDS.For diffusion-controlled desorption,peak temperature of TDS increases with specimen size.Meanwhile,with the same radius or half-thickness,peak temperature increases in the order of sphere,cylinder and plate.For diffusion controlled desorption,at constant initial hydrogen content,TDS peak temperature increases with trap sites density.At constant trap site density,TDS peak temperature increases with decreasing initial occupancy.Meanwhile,TDS varies with initial hydrogen distribution in the specimen.

关键词： Hydrogen Embrittlement Thermal Desorption Spectrum Diffusion-Controlled Desorption

作者: Lin Cheng Masato Enomoto

作者单位: College of Science,Wuhan University of Science and Technology,947 Heping Avenue,Qingshan District,Wu Graduate School of Science and Engineering,Ibaraki University,Nakanarusawa,Hitachi 316-8511,Japan

会议类型: 国际会议

会议名称: Energy Materials 2014(第一届能源材料国际会议)

会议地点: 西安

会议语种:英文

页码: 687-692

在线出版日期: 2014-11-04（万方平台首次上网日期，不代表论文的发表时间）