中文摘要：

利用离子加速器在室温下对纯铝注入氘离子或氢离子，然后在透射电镜中对注氘铝或注氢铝中的气泡进行电子束辐照，发现在电子束辐照下气泡会长大、破裂．随着气泡的变化，选区电子衍射花样中出现了表示多晶存在的衍射环．这表明电子束辐照气泡时，发生某种放热现象，从而使附近的铝先熔化后再凝固，由单晶变为多晶．

英文摘要：

As known for a long time, bubbles in liquid would emit light under ultrasonic waves. This experiment, called sonoluminescence, has attracted many people to research on it, but its mechanism is not yet clear. It is reasonable to think that similar phenomenon involving bubbles may happen in solid materials, but its opacity prevents researchers to detect such a kind of phenomenon. This paper investigates the change of gas bubbles by transmission electron microscope （TEM）, being able to overcome the difficulty of opacity of materials. Thin film samples of pure aluminum are prepared for TEM experiment by jet chemical polishing. The samples are implanted first by deuterium or hydrogen at room temperature using ion accelerator, followed by electron irradiation under 200 kV TEM. Gas bubbles will form in aluminum after ion implantation, and then grow into larger ones or be collapsed under electron irradiation. Electron diffraction rings of polycrystals appear together with the change of gas bubbles. This kind of diffraction rings of polycrystals could be observed both in deuterium-implanted and hydrogen-implanted aluminum, but would never be found in the case of electron irradiation on the aluminum without implantation of hydrogen or deuterium. The polycrystals of aluminum are not due to the heating effect of electron beam, even electron beam could make a hole in the film sample finally. For the sample of aluminum containing no hydrogen or deuterium, only dislocation loops can be observed during electron irradiation. It may be that a kind of heat emission occurs when the gas bubbles are irradiated by electron beams, but the heat emission would not be due to deuterium fusion reaction because the electron beam-induced polycrystals occur not only in deuterium case, but also in hydrogen case, indicating that the implanted deuterium is not the necessary condition for heat emission. In addition, the energy dispersive spectrometer in TEM is used to detect the possible unique X-ray signals, but none of any special peak below