Title Effect of cooling rate on morphology and type of vanadium-containing phases in Al-10V master alloy
Author Qing-feng Zhu1, 2, *Yi Meng1, 3, Yan-lei Kang1, 2, Shu-ping Kong1, Yang-peng Ou1, Yu-bo Zuo1
Address 1. Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China; 2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China; 3. School of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China
Key words Al-V master alloy; cooling rate; vanadium-containing phase; solidification
CLC Nmuber TG146.21
Document Code A
Article ID 1672-6421(2019)05-300-07
Abstract

Effects of cooling rates on the morphology, sizes and species of primary vanadium-containing phases in Al-10V master alloys were investigated. The results show that the primary vanadium-containing phases with different morphologies and compositions present in Al-10V master alloys at different cooling rates with the pouring temperature of 1,170 C. When the Al-10V master alloy is solidified in the refractory mold at a cooling rate of 2 Cs-1, the vanadium-containing phases are mainly plate-like Al10V phases, with the average size of 100.0 m in the center and 93.2 m at the edge of the ingot. When the master alloy is solidified in the graphite mold at a cooling rate of 24.3 Cs-1, the primary vanadium-containing phases are dendritic Al3V phases, with the average length of 297.0 m for the first dendrite in the center and 275.0 m at the edge of the ingot. The secondary dendrite arm spacing (SDAS) is 9.5 m in the center and 9.3 m at the edge of the ingot, respectively. When the solidification is carried out in the copper mould at a cooling rate of 45.7 Cs-1, the primary vanadium-containing phases are also Al3V phases but with smaller size, compared with that prepared at the cooling rate of 24.3 Cs-1. As a result, the average length is 190.0 m for the first dendrite in the center and 150.0 m at the edge of the ingot. The SDAS is 9.8 m in the center and 4.4 m at the edge of the ingot, respectively.