Convoluted dislocation loops induced by helium irradiation in reduced-activation martensitic steel and their impact on mechanical properties

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• 作者：Fengfeng Luo^a ; Z. Yao^b ; Liping Guo^a ; ^{guolp@whu.edu.cn" class="auth_mail} ; Jinping Suo^c ; Yongming Wen^a
• 关键词：Dislocation loops ; Helium ; Transmission electron microscopy ; Reduced-activation martensitic steel ; Irradiation hardening
• 刊名：Materials Science and Engineering: A
• 出版年：23 June 2014
• 年：2014
• 卷：607
• 期：Complete
• 页码：390-396
• 全文大小：1743 K

文摘

Helium irradiation induced dislocation loops in reduced-activation martensitic steels were investigated using transmission electron microscopy. The specimens were irradiated with 100 keV helium ions to 0.8 dpa at 350 °C. Unexpectedly, very large dislocation loops were found, significantly larger than that induced by other types of irradiations under the same dose. Moreover, the large loops were convoluted and formed interesting flower-like shape. The large loops were determined as interstitial type. Loops with the Burgers vectors of b=銆?00銆?were only observed. Furthermore, irradiation induced hardening caused by these large loops was observed using the nano-indentation technique.