ZrCo和Zr0.7Hf0.3Co合金中氦泡演化和氦热释放研究

采用混合能量离子注入法在ZrCo及Zr_(0.7)Hf_(0.3)Co合金中引入氦,利用透射电镜观察氦泡形貌随贮存时间的演化。结果表明Zr_(0.7)Hf_(0.3)Co中氦泡平均尺寸比ZrCo更小,随贮存时间的延长,两者均被观察到氦泡的合并与长大。利用氦热释放谱研究贮存时间对氦热释放行为的影响,当贮存时间达到105d时,ZrCo中氦的总释放量和在较低温度下的释放分数均减少;而Zr_(0.7)Hf_(0.3)Co合金在贮存的175d内,较低温度下释放分数逐渐增加,总释放量无明显变化,这表明Zr_(0.7)Hf_(0.3)Co比ZrCo具有更优异的固氦性能。

Investigation on Helium Evolution and Thermal Helium Release Behavior in ZrCo and Zr0.7Hf0.3Co Alloys

Helium was introduced into ZrCo and Zr_0.7Hf_0.3Co alloys by mixed energy ion implantation. The evolution of helium bubble morphology with storage time was observed by Transmission Electron Microscope (TEM). Results showed that the average size of helium bubbles in Zr_0.7Hf_0.3Co alloy was smaller than that of ZrCo and both of them were observed in the coalescence and growth of helium bubbles with storage time increasing. The effect of storage time on the thermal helium desorption behavior was investigated by Thermal Desorption Spectroscopy (TDS). Results showed that in ZrCo alloy the helium release fraction at lower temperature range decreased sharply and the total helium desorption capacity decreased with the storage time reaching 105 days. While in the case of Zr_0.7Hf_0.3Co, the helium release fraction at lower temperature range gradually increased and the total desorption capacity of helium was almost constant during the storage period of 175 days. This indicated that Zr_0.7Hf_0.3Co alloy had more superior ability to contain helium than ZrCo alloy.