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在室温下，利用离子加速器对纯铝透射样品分别注入He+，Ne+和Ar+三种惰性气体离子，通过透射电子显微镜原位观察分析了纯铝中三种气体气泡在电子束辐照下形貌及电子衍射花样的变化.实验表明，在200 keV电子束辐照下，三种惰性气体气泡均会合并长大，亮度逐渐增强，最终破裂，气泡内部产生许多约几个纳米的黑色斑点衬度像，选区电子衍射花样由单晶斑点衍射花样变为多晶衍射环.这一现象的原因可能是气泡在电子束辐照过程中发生了放热反应，使气泡附近铝熔化后再结晶产生多晶，从而在电子衍射花样中观察到了多晶衍射环.然而，氦气泡在80 keV电子束辐照下氦气泡形貌和选区电子衍射花样保持不变，辐照后衍射花样中无多晶衍射环产生；氦氩混合气体气泡在200 keV电子束辐照下气泡形貌和选区电子衍射花样同样保持不变；这可能与电子束能量和气泡内气体压力有关.In the early 1990s, Japanese scholars unexpectedly observed that single crystal changes into polycrystal in deuterium-implanted aluminum under electron irradiation, but never found the same phenomenon in the hydrogen-implanted aluminum. However, previous study of our group has proved that the polycrystalline phenomenon can also be observed in hydrogen-implanted aluminum during electron irradiation. In this paper, the behavior of inert gas bubbles in aluminum under electron irradiation is investigated, aiming to further explore the effects of ion species, electron voltage and the pressure of bubbles on the anomalous heat-releasing reaction of bubbles induced by electron irradiation. In the experiment, the transmission electron microscope (TEM) samples of pure aluminum were implanted with He+, Ne+, Ar+ respectively by ion accelerator at room temperature. The TEM is used to in-situ observe and investigate the evolution of microstructure and the change of selected electron diffraction patterns of gas bubbles during electron irradiation. The results show that gas bubbles form in aluminum sample after ion implantation. During 200 keV electron irradiation TEM results show that the three kinds of inert gas bubbles all coalesce, grow up and bust separately. Finally, lots of nanoscale black dots appear inside them. At the same time, the electron diffraction patterns change from single crystal diffraction spots to polycrystalline diffraction rings. The dark field images indicate that the diffraction rings are induced by these black dots. Moreover, from the characterization of the diffraction rings, it is known that these black dots are pure aluminum rather than aluminum oxide. Therefore, the possibility that the diffraction rings result from aluminum oxide is eliminated. It is assumed that a certain kind of heat-releasing reaction should happen when the gas bubbles are irradiated by electrons, which leads to the poly-crystallization of aluminum after electron irradiation. However, while helium bubbles are irradiated by electrons with an energy of 80 keV, no diffraction ring is observed after electron irradiation. The same phenomenon as that in the case of helium bubbles irradiated by 80 keV electrons is observed. When helium and argon mixed bubbles with polygonal shape are irradiated by 200 keV electrons, no diffraction ring is observed after electron irradiation either. The reason might be related to the energy of the electron beam and the pressure of gas bubbles separately. There should be a threshold value of electron voltage for the heat-releasing reaction. In addition, the pressure of the gas bubbles is also a key factor for the heat-releasing reaction. The heat-releasing phenomenon of gas bubbles reminds us of the sonoluminescence phenomenon. By model calculation, it is predicted that there is a plasma core in the bubble during sonoluminescence. According to the hint from researches of sonoluminescence, an assumption is made to explain the mechanism of heat-releasing reaction of gas bubbles during electron irradiation. It is that the implanted gas in high pressure bubbles in aluminum is excited into plasma during electron irradiation. When the energy of plasma in the bubbles is accumulated to a certain degree, the plasma is extinguished suddenly. In this process, a lot of heat is released to melt the aluminum, thus leading the aluminum to recrystallize.
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Keywords:
- inert gas bubbles /
- aluminum /
- electron beam irradiation /
- polycrystalline diffraction rings
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[13] Rong Y H 2006 Introduction to Analytical Electron Microscopy (Beijing: Higher Education Press) p28 (in Chinese)[戎咏华 2006 分析电子显微学导论 (北京: 高等教育出版社) 第28页]
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[16] Gandhi K, Dixit D K, Dixit B K 2010 Physica B 405 3075
[17] Donnelly S E, Rossouw C J 1986 Nucl. Instrum. Meth. Phys. Res. 13 485
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[19] Evans J H, Mazey D J 1986 J. Nucl. Mater. 138 176
[20] Cox R J, Goodhew P J, Evans J H 1987 Acta Metall. 35 2497
[21] Wan F R 1993 Irradiation Damage in Metal Materials (Beijing: Science Press) p101 (in Chinese)[万发荣 1993 金属材料的辐照损伤 (北京: 科学出版社) 第101页]
[22] Moss W C, Clarke D B, Young D A 1997 Science 276 1398
[23] Flannigan D J, Suslick K S 2005 Nature 434 52
[24] Zhang W J, An Y 2015 Chin. Phys. B 24 047802
[25] Gharib M, Mendoza S, Rosenfeld M, Beizai M, Pereira F J A 2017 PNAS 114 12657
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[1] Trinkaus H 1983 Radiat. Eff. 78 189
[2] Swijgenhoven H V, Knuyt G, Vanoppen J, Stals L M 1983 J. Nucl. Mater. 114 157
[3] Krishan K 1982 Radiat. Eff. 66 121
[4] Donnelly S E 1985 Radiat. Eff. 90 1
[5] Birtcher R C, Donnelly S E, Templier C 1994 Phys. Rev. B 50 764
[6] Johnson P B, Lawson F 2006 Nucl. Instrum. Methods Phys. Res. B 243 325
[7] Kinoshita H, Takahashi H 1992 Bull. Fac. Eng. Hokkaido Univ. 162 109
[8] Kamada K, Kinoshita H, Takahashi H, Kakihana H 1996 J. At. Energy Soc. 38 143
[9] Kamada K, Kinoshita H, Takahashi H 1996 Jpn. J. Appl. Phys. 35 738
[10] Kamada K 1992 Jpn. J. Appl. Phys. 31 L1287
[11] Li J, Gao J, Wan F R 2016 Acta Phys. Sin. 65 026102 (in Chinese)[李杰, 高进, 万发荣 2016 物理学报 65 026102]
[12] Li J 2015 M. S. Thesis (Beijing: University of Science and Technology Beijing) (in Chinese)[李杰2015 硕士学位论文 (北京: 北京科技大学)]
[13] Rong Y H 2006 Introduction to Analytical Electron Microscopy (Beijing: Higher Education Press) p28 (in Chinese)[戎咏华 2006 分析电子显微学导论 (北京: 高等教育出版社) 第28页]
[14] Vladimir A L, Ramesh S, Ahmed H Z 2005 PNAS 102 7069
[15] Felde A V, Fink J, Mller-Heinzerling T, Pflger J, Scheerer B, Linker G, Kaletta D 1984 Phys. Rev. Lett. 53 922
[16] Gandhi K, Dixit D K, Dixit B K 2010 Physica B 405 3075
[17] Donnelly S E, Rossouw C J 1986 Nucl. Instrum. Meth. Phys. Res. 13 485
[18] Mitsuishi K, Song M, Furuya K, Birtcher R C, Allen C W, Donnelly S E 1999 Nucl. Instrum. Meth. Phys. Res. 148 184
[19] Evans J H, Mazey D J 1986 J. Nucl. Mater. 138 176
[20] Cox R J, Goodhew P J, Evans J H 1987 Acta Metall. 35 2497
[21] Wan F R 1993 Irradiation Damage in Metal Materials (Beijing: Science Press) p101 (in Chinese)[万发荣 1993 金属材料的辐照损伤 (北京: 科学出版社) 第101页]
[22] Moss W C, Clarke D B, Young D A 1997 Science 276 1398
[23] Flannigan D J, Suslick K S 2005 Nature 434 52
[24] Zhang W J, An Y 2015 Chin. Phys. B 24 047802
[25] Gharib M, Mendoza S, Rosenfeld M, Beizai M, Pereira F J A 2017 PNAS 114 12657
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