Space Materials Science in China: I. Experiment Studies under Microgravity
doi: 10.11728/cjss2020.05.946
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摘要: The virtual absence of gravity-dependent phenomena in microgravity allows an in-depth understanding of fundamental events that are normally obscured and therefore are difficult to study quantitatively on Earth. Of particular interest is that the low-gravity environment aboard space provides a unique platform to synthesize alloys of semiconductors with homogeneous composition distributions, on both the macroscopic and microscopic scales, due to the much reduced buoyancy-driven convection. On the other hand, the easy realization of detached solidification in microgravity suppresses the formation of defects such as dislocations and twins, and thereby the crystallographic perfection is greatly increased. Moreover, the microgravity condition offers the possibilities to elucidate the liquid/solid interfacial structures, as well as clarify the microstructure evolution path of the metal alloys (or composites) during the solidification process. Motivated by these facts, growths of compound semiconductors and metal alloys were carried out under microgravity by using the drop tube, or on the scientific platforms of Tiangong-2 and SJ-10. The following illustrates the main results.Abstract: The virtual absence of gravity-dependent phenomena in microgravity allows an in-depth understanding of fundamental events that are normally obscured and therefore are difficult to study quantitatively on Earth. Of particular interest is that the low-gravity environment aboard space provides a unique platform to synthesize alloys of semiconductors with homogeneous composition distributions, on both the macroscopic and microscopic scales, due to the much reduced buoyancy-driven convection. On the other hand, the easy realization of detached solidification in microgravity suppresses the formation of defects such as dislocations and twins, and thereby the crystallographic perfection is greatly increased. Moreover, the microgravity condition offers the possibilities to elucidate the liquid/solid interfacial structures, as well as clarify the microstructure evolution path of the metal alloys (or composites) during the solidification process. Motivated by these facts, growths of compound semiconductors and metal alloys were carried out under microgravity by using the drop tube, or on the scientific platforms of Tiangong-2 and SJ-10. The following illustrates the main results.
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Key words:
- Space materials /
- Microgravity /
- Bubble behavior /
- Microstructural evolution
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[1] YUAN Zhangfu, WANG Rongyue, XIE Shanshan, et al. Wettability of high-temperature melts under microgravity and ground gravity conditions[J]. Sci. Sin. Phys. Mech. Astron., 2020, 50:047004 [2] LUO X H, WANG Y Y, LI Y. Role of hydrostatic pressure and wall effect in solidification of TC8 alloy[J]. NPJ Microgravity, 2019, 5:23 [3] LI Wang, JIANG Hongxiang, ZHANG Lili, et al. Solidification of Al-Bi-Sn immiscible alloy under microgravity conditions of space[J]. Scr. Mater., 2019, 162:426-431 [4] YIN Zhigang, ZHANG Xingwang, WU Jinliang. Growth of III-V semiconductor crystals under microgravity[J]. Sci. Sin. Phys. Mech. Astron., 2020, 50:047003 [5] YU J, INATOMI Y, KUMAR V N, et al. Homogeneous InGaSb crystal grown under microgravity using Chinese recovery satellite SJ-10[J]. NPJ Microgravity, 2019, 5(1):8 -
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