Shen Wenzhu, Liu Chenwei, Lei Penghui, Ran Guang
School of Materials and Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan Province, China.
College of Energy, Xiamen University, Xiamen 361102, Fujian Province, China.
Materials (Basel). 2018 Oct 22;11(10):2056. doi: 10.3390/ma11102056.
Two types of Zr⁻0.8Sn⁻1Nb⁻0.3Fe Zr alloys were irradiated by krypton ions in the temperature range from 320 to 400 °C. The microstructure of the as-received alloys showed that the sizes of Zr crystals and (Zr, Nb)₂Fe particles with face-centered cubic (FCC) structure increased from 3.9 μm to 6.0 μm and from 74.6 nm to 89.6 nm, respectively, after cold rolling and subsequent annealing. Kr⁺ irradiation-induced bubble formation in the Zr matrix was observed. The size of the gas bubbles increased with increasing ion fluence and irradiation temperature. An equation that related the bubble size, ion fluence, and temperature were established. Irradiation-induced amorphization of particles was observed and found to be related to the fabrication process and irradiation parameters. The particles in alloy #1 showed a higher irradiation tolerance than those in alloy #2. The threshold damage dose for the amorphization of particles in alloy #2 was 3.5 dpa at 320 °C and 4.9 dpa at 360 °C. The mechanisms for bubble growth and particle amorphization are also discussed.
两种Zr⁻0.8Sn⁻1Nb⁻0.3Fe锆合金在320至400°C的温度范围内受到氪离子辐照。原始合金的微观结构表明，经过冷轧和随后的退火后，具有面心立方（FCC）结构的Zr晶体和(Zr, Nb)₂Fe颗粒的尺寸分别从3.9μm增加到6.0μm和从74.6nm增加到89.6nm。观察到Kr⁺辐照在Zr基体中诱导气泡形成。气泡尺寸随着离子注量和辐照温度的增加而增大。建立了一个将气泡尺寸、离子注量和温度相关联的方程。观察到辐照诱导颗粒非晶化，并且发现其与制造工艺和辐照参数有关。合金#1中的颗粒比合金#2中的颗粒表现出更高的辐照耐受性。合金#2中颗粒非晶化的阈值损伤剂量在320°C时为3.5 dpa，在360°C时为4.9 dpa。还讨论了气泡生长和颗粒非晶化的机制。
