【摘 要】
：
熔盐堆作为第四代先进裂变反应堆之一,具有优异的应用前景.熔盐堆内高温、强中子辐照及腐蚀性的服役环境对堆内合金结构材料提出了很高的要求.镍基高温合金以其优异的高
【机 构】
：
中科院上海应用物理研究所,上海,201800
论文部分内容阅读
熔盐堆作为第四代先进裂变反应堆之一,具有优异的应用前景.熔盐堆内高温、强中子辐照及腐蚀性的服役环境对堆内合金结构材料提出了很高的要求.镍基高温合金以其优异的高温力学性能及抗腐蚀性被选为熔盐堆的结构材料,然而,镍基合金离子辐照微观结构的演化却鲜有报道.本文采用慢正电子淹没技术分析了辐照前后S参数的变化.实验中纯镍及GH3535样品的辐照实验是在中科院兰州近代物理所320kV辐照实验终端进行的.室温条件下,样品通过7 MeV Xe26+辐照,辐照损伤分别为0.1dpa,1dpa,10dpa.样品辐照前后的慢正电子测试是在中国科技大学进行的,结果如图一所示.图一(a)(c)分别为辐照前后纯镍及GH3535的S参数随辐照剂量的变化.纯镍辐照后S参数明显升高且随辐照剂量而增加,说明辐照后样品中有空位型缺陷产生,空位型缺陷的浓度随辐照剂量的升高而升高；GH3535辐照后S参数明显升高但随辐照剂量的升高没有明显的变化,说明辐照后样品中有空位型缺陷产生,而空位型缺陷的浓度没有随辐照剂量的升高而升高.图一(b)(d)分别为辐照前后纯镍及GH3535的S-W参数分布,由图可知辐照后S-W参数几乎分布在一条真线上,说明辐照产生的缺陷类型是一致的.
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