钒合金的电子辐照损伤研究  

Electron Irradiation Damage of Vanadium-Based Alloy

作　　者：周康宁[1] 张崇宏[2] 崔舜[3] 胡晓康[3] 马通达[1] 

机构地区：[1]北京有色金属研究总院国家有色金属及电子材料分析测试中心,北京100088 [2]中国科学院近代物理研究所,甘肃兰州730000 [3]北京有色金属研究总院粉末冶金及特种材料研究所,北京100088

出　　处：《稀有金属》2015年第9期775-781,共7页Chinese Journal of Rare Metals

基　　金：国家科技部磁约束核聚变能发展研究(ITER)专项项目(2011GB108003)资助

摘　　要：在室温(20℃)和高温(450℃)下,使用1 m V-高压透射电子显微镜(TEM)原位观察了V-4Cr-4Ti合金微观组织结构的演化和点缺陷团簇行为。原位电子辐照诱导Ti-C-O析出物发生分解,并引入缺陷团簇。这些缺陷团簇捕获电子辐照引入的点缺陷,随着辐照剂量的增加而单调长大。分析这些缺陷团簇平均尺寸与辐照剂量的依赖关系发现:当辐照剂量高于1 dpa时,缺陷团簇的长大速率小于辐照剂量低于0.5 dpa时的速率,说明V-4Cr-4Ti合金中缺陷团簇的长大速率随着辐照剂量的增加而减小。167℃下,运用电子加速器对V-4Cr-4Ti合金进行了离位电子辐照实验,采用小冲杆实验法(SPT)对电子辐照前后V-4Cr-4Ti合金样品进行了力学性能测试。发现相比于未经电子辐照的钒合金样品,经过电子辐照的钒合金样品开始发生塑性形变的位移减少了0.04 mm,说明经过电子辐照后,合金发生了延性损失,塑性降低。随着电子辐照剂量的增加,钒合金样品的最大断裂载荷和断裂韧性均单调增加。The microstructure evolution and defect clustering behavior of V-4Cr4Ti alloy were observed in situ using a 1 mV-high transmission electron microscope （TEM） at 20 and 450 ℃. It was found that Ti-C-O precipitates were not stable and dissociated during irradiation. And the defect clusters formed and trapped irradiation-induced point defects to grow up monotonously with the irradiation dose increasing. The curves of dependence of defect clusters mean size on irradiation dose showed that the growth rate of defect clusters size for the doses of 〈 0.5 dpa was larger than that for the doses of 〉 1 dpa. This demonstrated that the size increased firstly and then decreased with further irradiation. The V-4Cr-4Ti alloy samples were ex-situ electron irradiated at 167 ℃. And the mechanical properties of unirradiated and irradiated V-4Cr4Ti alloys were investigated by small punch test （SPT）. The SPT load-displacement curve showed that the displacements to occur plastic deformation in irradiated alloys were 0.04 mm smaller than those in unirradiated alloys. This demonstrated that the ductility lost and plasticity degraded. The breaking load and the fracture toughness monotonously increased with the irradiation dose increasing.

关 键 词：钒合金 电子辐照 显微组织 力学性能 

分 类 号：TG146.413[一般工业技术—材料科学与工程]