Grain refinement effects of Al based alloys with low titanium content produced by electrolysis

来源期刊：中国有色金属学报(英文版)2002年第6期

论文作者：刘志勇 王明星 翁永刚 宋天福 谢敬佩 霍裕平

文章页码：1121 - 1126

Key words：aluminum alloy; low titanium content; electrolysis; grain refinement

Abstract: A series of Al based alloys with low titanium contents (mass fraction) from 0.178% to 0.526% were directly produced in ordinary industrial electrolyzer. The electrolyzing results show that producing Al based alloys with titanium contents of less than 0.30% without great loss of electrolysis efficiency is possible. The quantitative analysis shows that this method has a great refining effect on transiting the coarse columnar grains in pure Al to equiaxed grains. The grain sizes decrease with the increase of titanium content and tend to a low limit at about 130μm. During the solidification, the non-equilibrium distribution of titanium leads to a great growth-restricting effect and a constitutional under-cooling zone in front of the growing liquid/solid interface.