Continuous Morphological Transition and Its Mechanism of Al3Ni Phase at the Liquid–Solid Interface During Solidification

• DOI: 10.1007/s11661-018-5059-4
• Publication Date: 2018-12-18T16:27:19Z
• Authors: Zongye Ding; Qiaodan Hu; Wenquan Lu; Naifang Zhang; Xuan Ge; Sheng Cao; Tianxing Yang; Mingxu Xia; Jianguo Li
• Keywords: 0205 materials engineering; 02 engineering and technology

The morphological transition and growth mechanism of Al3Ni phase during solidification at the liquid Al/solid Ni interface was investigated through synchrotron radiography. The remelted peritectic Al3Ni is dominated by coalescence of adjacent grains and precipitation with the morphology changing from columnar, irregular, scallop type to faceted shape. The hollow proeutectic Al3Ni is formed on a solid base. The increased r/R ratio and steep variation lead to the change from regular to irregular hollowness with asymmetrical shape.