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金属学报  2004 

强流脉冲离子束辐照金属Ti相变传热的数值分析

, PP. 1221-1226

Keywords: 强流脉冲离子束,金属Ti,传热

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Abstract:

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---150J/cm2,脉冲宽度为120ns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0.7J/cm2$.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,150J/cm2时可达29.25um.最大液相层厚度则先增加后减小,80J/cm2时最大液相层厚度为0.5um.能量密度为70J/cm2的HIPIB辐照金属Ti实验测定的烧蚀质量7.2mg与计算值大致相符.

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