Zhao Jianhua, He Jiansheng, Tang Qi, Wang Tao, Chen Jing
State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China.
Materials (Basel). 2016 Oct 26;9(11):869. doi: 10.3390/ma9110869.
A series of Al-4Ti master alloys with various TiAl₃ particles were prepared via pouring the pure aluminum added with K₂TiF₆ or sponge titanium into three different molds made of graphite, copper, and sand. The microstructure and morphology of TiAl₃ particles were characterized and analyzed by scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS). The microstructure of TiAl₃ particles in Al-4Ti master alloys and their grain refinement efficiency in commercial-purity aluminum were investigated in this study. Results show that there were three different morphologies of TiAl₃ particles in Al-4Ti master alloys: petal-like structures, blocky structures, and flaky structures. The Al-4Ti master alloy with blocky TiAl₃ particles had better and more stable grain refinement efficiency than the master alloys with petal-like and flaky TiAl₃ particles. The average grain size of the refined commercial-purity aluminum always hereditarily followed the size of the original TiAl₃ particles. In addition, the grain refinement efficiency of Al-4Ti master alloys with the same morphology, size, and distribution of TiAl₃ particles prepared through different processes was almost identical.
通过将添加有K₂TiF₆或海绵钛的纯铝倒入由石墨、铜和砂制成的三种不同模具中，制备了一系列含有不同TiAl₃颗粒的Al-4Ti中间合金。采用带有能谱仪（EDS）的扫描电子显微镜（SEM）对TiAl₃颗粒的微观结构和形态进行了表征和分析。本研究考察了Al-4Ti中间合金中TiAl₃颗粒的微观结构及其在工业纯铝中的晶粒细化效率。结果表明，Al-4Ti中间合金中TiAl₃颗粒存在三种不同形态：花瓣状结构、块状结构和片状结构。具有块状TiAl₃颗粒的Al-4Ti中间合金比具有花瓣状和片状TiAl₃颗粒的中间合金具有更好、更稳定的晶粒细化效率。细化后的工业纯铝的平均晶粒尺寸总是遗传地遵循原始TiAl₃颗粒的尺寸。此外，通过不同工艺制备的具有相同形态、尺寸和分布的TiAl₃颗粒的Al-4Ti中间合金的晶粒细化效率几乎相同。
