W-K合金中空位型缺陷的浓度和尺寸研究  

Study on the concentration and size of vacancy defect in W-K alloy

作　　者：张元元 刘南顺 张培源 邓爱红 ZHANG Yuan-Yuan;LIU Nan-Shun;ZHANG Pei-Yuan;DENG Ai-Hong(College of Physics,Sichuan University,Chengdu 610064,China)

机构地区：[1]四川大学物理学院

出　　处：《四川大学学报（自然科学版）》2019年第6期1113-1117,共5页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金(11675114,11275132)

摘　　要：W-K合金具有熔点高,抗热冲击性能强,抗氢氦等离子辐照能力强等众多优点,特别是钾泡的形成能稳定晶界、充当钉扎点和细化晶粒的作用,从而改善了W-K合金材料的性能.由于正电子寿命谱分析技术对纳米尺度的空位型缺陷极为敏感,因此本文采用该方法测量了正电子在不同钾含量下W-K合金的寿命值大小和相应的强度,并依据正电子湮没的两态捕获模型,对拟合的正电子寿命成分进行数据处理,同时对钾泡浓度和尺寸的变化情况进行了分析和讨论.W-K alloy has many advantages,such as high melting point,the resistance to thermal shock,and excellent resistance to helium hydrogen plasma irradiation.The key is the formation of potassium bubbles which can stabilize the grain boundary,acting as pinning point and refine grain of W-K alloy,and thus the properties of materials can been greatly improved.Positron annihilation lifetime spectroscopy(PLAS)is extremely sensitive to the concentration and size of nanoscale defects.In this paper,the values of positron lifetime in W-K alloy at different potassium contents ware measured by using the method of positron annihilation lifetime spectroscopy.According to the two-state capture model,the positron lifetime spectrum was fitted as two-lifetime component,and the data were processed and used to analyze the change of concentration and size of potassium bubble in the W-K samples.

关 键 词：W-K合金 空位型缺陷 正电子湮没寿命谱 

分 类 号：TG146.4[一般工业技术—材料科学与工程]