晶体孪晶
等轴晶
金属间化合物
形态学(生物学)
材料科学
准晶
结晶学
缓慢冷却
二十面体对称
棒
Crystal(编程语言)
冶金
微观结构
化学
合金
生物
医学
病理
程序设计语言
替代医学
遗传学
计算机科学
标识
DOI:10.1016/j.jallcom.2021.162318
摘要
Twinned crystal growth is studied in primary Al45Cr7 and Al13Fe4 intermetallic compounds (IMCs) to explore how different twin types and twin variants affect the growth morphology during solidification. In both IMCs, the number of twin variants increased as the cooling rate increased and, by ~ 5 K/s, both IMCs formed cyclic twins with combined icosahedral (Al45Cr7) or decagonal (Al13Fe4) pseudosymmetry. The growth morphology depended on which twin variants were present. When all twin domains shared a common direction that was a rod growth direction in single crystals, twinning did not prevent crystals from growing as rods. This was the case for both IMCs at slow cooling rate and Al13Fe4 at all cooling rates. Cyclic twinning of Al13Fe4 generated many re-entrant corners but resulted in only a modest reduction in rod aspect ratio. In contrast, when twin domains in Al45Cr7 had common directions along multiple pseudo-i(2) axes, crystal growth transitioned from rod-like to a near-equiaxed morphology.
科研通智能强力驱动
Strongly Powered by AbleSci AI