Improvement of yttrium on the hot tearing susceptibility of 6TiB2/AI-5Cu composite

• Published in: 中国稀土学报：英文版 Vol. 33; no. 12; pp. 1335 - 1340
• Main Author: 张晓波 孙靖 汪明亮 张亦杰 马乃恒 王浩伟
• Format: Journal Article
• Language: English
• Published: 2015
• Subjects: TiB2; 复合添加; 晶粒尺寸; 温度范围; 热裂倾向; 热裂敏感性; 细化晶粒; 铝基复合材料
• ISSN: 1002-0721; 2509-4963

To improve the severe hot tearing susceptibility of TiB2 reinforced A1-5Cu matrix composites, the present research investigated the influence of Y on the hot tearing susceptibility of 6TiB2/A1-5Cu composite. For the composite added with Y, the solidification temperature range was shortened, which was caused by the novel rl-A18Cu4Y phase. The grain size of 6TiB2/A1-5Cu composite was 39.8 p.m. The addition of Y promoted the grain refinement, and the grain sizes were 36.33, 33.42 and 26.77 μm for 6TiB2/AI-5Cu with 0.2 wt.%, 0.5 wt.% and 1 wt.% Y, respectively. The decrease of solidification temperature range and grain size was beneficial to the hot tearing susceptibility improvement. Furthermore, the hot tearing initiation force increased from 44 to 288 N, when 1 wt.% Y was added in 6TiB2/A1-5Cu. For the above significant influence, the hot tearing susceptibility values were reduced by 12.2 wt.%, 57.7 wt.% and 66.8 wt.% for 6TiBjA1-5Cu with 0.2 wt.%, 0.5 wt.% and 1 wt.% Y, accordingly.