铸造技术2013，Vol.34Issue(4)：383-386,4.
三元Al-Ti-Fe合金的快速凝固组织演变研究
Microstructure Evolution of Al-Ti-Fe Ternary Alloy During Rapid Solidification
摘要
Abstract
Ternary Al-32.7％Ti-11.4％Fe alloy droplets were rapidly solidified in drop tube with a maximum undercooling of 352 K(0.21T1).When droplet diameter D＞300 μm,two phase transitions,L→TiAl3 (1 627 K) and L2→Al3Fe0.25Ti0.75 (1 340 K)take place during solidification process,and the microstructure is characterized by a small amount of flaky Al3Fe0.25Ti0.75 phase distributing in the gaps of primary TiAl3 dendrites.When the diameter of droplet decreases below 300 μm,the primary TiAl3 phase grows rapidly and the droplet solidifies completely before the nucleation of Al3Fe0..25Ti0.75 phase.The solidified microstructure is only composed of TiAl3 single dendritic phase.Meanwhile,a conspicuous solute trapping effect occurs during rapid growth of the primary TiAl3 phase.The Fe content in TiAl3 phase is much higher than that in equilibrium solidification and increases remarkably with the decrease of droplet diameter.关键词
三元合金/快速凝固/落管/相组成Key words
ternary alloy/ rapid solidification/ drop tube/ phase constitution分类
矿业与冶金引用本文复制引用
王晶晶,鲁晓宇,阮莹..三元Al-Ti-Fe合金的快速凝固组织演变研究[J].铸造技术,2013,34(4):383-386,4.基金项目
国家自然科学基金资助项目(51001087,51171153) （51001087,51171153）
西北工业大学基础研究基金资助项目(JC201157) （JC201157）
