材料科学
辐照
位错
透射电子显微镜
分析化学(期刊)
大气温度范围
结晶学
相(物质)
离子
通量
微观结构
复合材料
纳米技术
热力学
物理
量子力学
有机化学
核物理学
化学
色谱法
作者
Bensu Tunca,Graeme Greaves,John Hinks,Per Persson,Fei Zhang,Konstantina Lambrinou
出处
期刊:Acta Materialia
[Elsevier]
日期:2021-03-01
卷期号:206: 116606-116606
被引量:10
标识
DOI:10.1016/j.actamat.2020.116606
摘要
Thin foils of the double solid solution $(Zr{_0.5},Ti{_0.5})_{2}(Al_{0.5},Sn_{0.5})C$ MAX phase were in situ irradiated in a transmission electron microscope (TEM) up to a fluence of $1.3\times10^{17} ions$ $cm^{-2}$ (${\sim}$ 7.5 dpa), using 6 keV $He^{+}$ ions. Irradiations were performed in the 350-800 {\deg}C temperature range. In situ and post-irradiation examination (PIE) by TEM was used to study the evolution of irradiation-induced defects as function of dose and temperature. Spherical He bubbles and string-like arrangements thereof, He platelets, and dislocation loops were observed. Dislocation loop segments were found to lie in non-basal-planes. At irradiation temperatures ${\geq}$ 450 {\deg}C, grain boundary tearing was observed locally due to He bubble segregation. However, the tears did not result in transgranular crack propagation. The intensity of specific spots in the selected area electron diffraction patterns weakened upon irradiation at 450 and 500 {\deg}C, indicating an increased crystal symmetry. Above 700 {\deg}C this was not observed, indicating damage recovery at the high end of the investigated temperature range. High-resolution scanning TEM imaging performed during the PIE of foils previously irradiated at 700 {\deg}C showed that the chemical ordering and nanolamination of the MAX phase were preserved after 7.5 dpa $He^{+}$ irradiation. The size distributions of the He platelets and spherical bubbles were evaluated as function of temperature and dose.
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