Many composite materials with various properties or special mechanical functions canbe made by directional distribution of eutectic or several phases.They have played an impor-tant role in magnetism, optics, aviation ...Many composite materials with various properties or special mechanical functions canbe made by directional distribution of eutectic or several phases.They have played an impor-tant role in magnetism, optics, aviation and astronautics. The composition process is oftencompleted by one phase(called the second phase) distributed in another phase matrix.展开更多
The formatting regulation of the nonfaceted and faceted plane in crystals is the important coverage in the field of crystallology research. Whether the transformation from faceted growth to nonfaceted growth can be ac...The formatting regulation of the nonfaceted and faceted plane in crystals is the important coverage in the field of crystallology research. Whether the transformation from faceted growth to nonfaceted growth can be achieved has long been a focal point because the crystallization mechanism influences the structural properties directly. Nowadays, it has been found that the transformation from faceted to nonfaceted growth of crystals can be induced when the overcooling of the melted alloys is high enough; other factors that can展开更多
This paper reports the investigation results on directional growth of Al-Mg2Si eutectic alloy in the SZ2 unmanned spaceship. The analysis shows that microgravity has influence on the directional growth of Al-Mg2Si eut...This paper reports the investigation results on directional growth of Al-Mg2Si eutectic alloy in the SZ2 unmanned spaceship. The analysis shows that microgravity has influence on the directional growth of Al-Mg2Si eutectic alloy. The eutectic colony in space-grown sample is larger than that in ground-grown sample, and the directional effect is not so good as that of terrestrial sample. But there is no obvious difference in the lamellar thickness between these samples, and lamellar interspacing in space sample is smaller than that grown on the ground. A simple discussion is done on the gravity effect on the directional growth of Al-Mg2Si eutectic alloy.展开更多
文摘Many composite materials with various properties or special mechanical functions canbe made by directional distribution of eutectic or several phases.They have played an impor-tant role in magnetism, optics, aviation and astronautics. The composition process is oftencompleted by one phase(called the second phase) distributed in another phase matrix.
文摘The formatting regulation of the nonfaceted and faceted plane in crystals is the important coverage in the field of crystallology research. Whether the transformation from faceted growth to nonfaceted growth can be achieved has long been a focal point because the crystallization mechanism influences the structural properties directly. Nowadays, it has been found that the transformation from faceted to nonfaceted growth of crystals can be induced when the overcooling of the melted alloys is high enough; other factors that can
文摘This paper reports the investigation results on directional growth of Al-Mg2Si eutectic alloy in the SZ2 unmanned spaceship. The analysis shows that microgravity has influence on the directional growth of Al-Mg2Si eutectic alloy. The eutectic colony in space-grown sample is larger than that in ground-grown sample, and the directional effect is not so good as that of terrestrial sample. But there is no obvious difference in the lamellar thickness between these samples, and lamellar interspacing in space sample is smaller than that grown on the ground. A simple discussion is done on the gravity effect on the directional growth of Al-Mg2Si eutectic alloy.
