强流脉冲离子束辐照金属Ti相变传热的数值分析  

NUMERICAL ANALYSIS OF HEAT TRANSFER DURING PHASE TRANSFORMATION ON TITANIUM IRRADIATED BY HIGH-INTENSITY PULSED IONS BEAM

作　　者：苗收谋[1] 雷明凯[1] 

机构地区：[1]大连理工大学材料工程系表面工程研究室,大连116024

出　　处：《金属学报》2004年第11期1221-1226,共6页Acta Metallurgica Sinica

基　　金：国家高技术研究发展计划项目2003AA305610;国家自然科学基金项目50241010资助

摘　　要：建立了强流脉冲离子束(HIPIB)辐照金属相变传热的理论模型.基于焓法发展的二维轴对称传热模型,考虑脉冲离子束源项的时间和空间分布,以及材料变热物性的影响,计算了能量密度为0.1—150 J/cm2,脉冲宽度为120 ns的HIPIB辐照金属Ti的温度场.HIPIB辐照金属Ti发生熔化和烧蚀的临界能量密度分别为0.2和0.7 J/cm。在脉冲辐照时间内,烧蚀深度单调增加,而液相层厚度呈先增加后减小、再增加的趋势.随着能量密度增加,最大烧蚀深度增加, 150 J/cm2时可达29-25μm.最大液相层厚度则先增加后减小,80 J/cm2时最大液相层厚度为0.5μm.能量密度为70 J/cm2的HIPIB辐照金属Ti实验测定的烧蚀质量7.2 mg与计算值大致相符.The theoretical model of heat transfer during phase transformation in metals irradiated by high-intensity pulsed ion beam (HIPIB) has been established. The temperature field in titanium irradiated by HIPIB with a pulse duration of 120 ns and an energy density range of 0.1-150 J/cm(2) was calculated using an axisymmetric model based on enthalpy formulation, considering the spatial and transient profiles of HIPIB and the temperature-dependent thermophysical properties of materials. The critical energy densities of HIPIB for melting and ablating of titanium are 0.2 and 0.7 J/cm(2), respectively. At a certain energy density, the ablation depth increased monotonously with the irradiation time during the pusle duration, and the thickness of liquid layer increased in the initial stage, and then decreased, finally increased again. With the increase of energy density, the maximum ablation depth reaches 29.25 mum under 150 J/cm(2), and the maximum thickness of liquid layer is 0.5 mum under 80 J/cm(2). The calculated ablation mass is similar to the measured mass of 7.2 mg for the titanium irradiated under 70 J/cm(2).

关 键 词：强流脉冲离子束 金属Ti 传热 焓法 数值分析 

分 类 号：TG156.99[金属学及工艺—热处理] TK124[金属学及工艺—金属学]