Directional solidification of Ti-49 at.%Al alloy

作者：Fan Jianglei^*; Li Xinzhong; Su Yanqing; Chen Ruirun; Guo Jingjie; Fu Hengzhi

来源：Applied Physics A-Materials Science & Processing, 2011, 105(1): 239-248.

DOI：10.1007/s00339-011-6497-7

Ti-49Al (at.%) alloy was directionally solidified in Bridgman-type directional solidification furnace. The specimens were directionally solidified under an argon atmosphere with the different growth rate (V=5-30 mu m/s) at a constant temperature gradient (G=12.1 K/mm), and with the different temperature gradient (G=2.8-12.1 K/mm) at a constant growth rate (V=10 mu m/s). The dendritic spacings (lambda (1)) were measured from both transverse and longitudinal sections of the specimens. The dependence of lambda (1) on the growth rate (V) and temperature gradient (G) were determined by using linear regression analysis. According to the experimental results, the value of lambda (1) decreases with the increase of values of V and G. The experimental results were compared with the current theoretical and numerical models, and similar previous experimental results.

• 出版日期2011-10
• 单位哈尔滨工业大学