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| OBSERVATION ON THE OXIDATION OF LIQUID Al BY ENVIRONMENTAL TRANSMISSION ELECTRON MICROSCOPE |
| CAI Jun1), LING Guoping1),CHEN Changan2), ZHANG Guikai2) |
| 1)Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027
2)State Key Laboratory of Surface Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621907 |
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Cite this article:
CAI Jun, LING Guoping,CHEN Changan, ZHANG Guikai. OBSERVATION ON THE OXIDATION OF LIQUID Al BY ENVIRONMENTAL TRANSMISSION ELECTRON MICROSCOPE. Acta Metall Sin, 2013, 49(8): 953-958.
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Abstract The study of liquid metal oxidation is of particular importance since some liquid metals are highly reactive with oxygen even under ultrahigh vacuum. The investigation of the oxidation behavior of liquid aluminum is strongly demanded due to its wide applications but relatively low melting point. However, it is still ambiguous about the products at the initial oxidation stage of liquid aluminum through the researches done in the past several decades. In order to investigate the initial oxidation products together with the oxidation mechanism of liquid aluminum, in-situ oxidation of nano aluminum powder was carried out at 720℃ in the environmental TEM (E-TEM). Prior to the oxidation, the nano aluminum powder was visualized and analyzed by E-TEM and DTA respectively.The results show that there is an amorphous Al2O3 film of 5—6 nm thick on the surface of the aluminum powder, which transforms toγ-Al2O3 at a temperature range of 350—550℃. By melting the nano powder to liquid followed by cooling under a total pressure of 10-4 Pa in E-TEM, oxide-free solid aluminum is obtained. Re-melting of the solid aluminum at 720℃ yields oxide-free liquid aluminum. After oxidation of the oxide-free liquid aluminum under an oxygen partial pressure of 10-2 Pa in E-TEM, α-Al2O3 nano wires appear on the liquid aluminum surface, demonstrating that the initialoxidation product of liquid aluminum isα-Al2O3. Moreover,the oxidation of liquid aluminum prepared from oxide-free bulk aluminum at 720℃ under an oxygen partial pressure of 10-2 Pa was also studied. The XRD analysis of the products confirms that the oxide is constituted of singleα-Al2O3. Additionally, this particular oxidation result of liquid aluminum is attributed to its liquid structure and vapor oxidation process.
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Received: 24 March 2013
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