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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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A508-3钢质子辐照条件下微结构演变研究
DOI: 10.3724/SP.J.1037.2012.00060, PP. 929-934
Keywords: A508-3钢,质子辐照,离位损伤,位错环
Abstract:
在室温下利用190keV质子对A508-3钢进行辐照,辐照剂量分别为0.108,0.216和0.271dpa.对辐照前后样品的微结构进行了TEM观察.结果表明,辐照没有产生可观察到的微空洞,辐照缺陷主要是位错环,且大部分为Burgers矢量为型的间隙型位错环;位错环大部分均匀分布在基体内,还可见位错环分布在位错线附近的情况;随辐照剂量的增加,位错环尺寸分布范围变宽,平均直径增大,当辐照剂量从0.108dpa增至0.271dpa时,位错环的平均直径由约1.8nm增至约4.6nm;位错环的数量密度在1022m-3数量级并随辐照剂量增加略有增加.对位错环的形成机制及辐照剂量对辐照硬化和脆化程度的影响进行了分析.在实验范围内,由位错环引起的硬化和脆化程度随辐照剂量增加而增大,未出现饱和现象.
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