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

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• 作者：Xiaobo ZHANG ((张晓波)) ; Jing SUN ((孙 靖)) ; Mingliang WANG ((汪明亮)) ; Yijie ZHANG ((张亦杰)) ; ^{robertzyj@sjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Naiheng MA ((马乃恒)) ; Haowei WANG ((王浩伟))
• 关键词：metal matrix composites ; microstructure ; hot tearing susceptibility ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2015
• 出版时间：1 December 2015
• 年：2015
• 卷：33
• 期：12
• 页码：1335-1340
• 全文大小：1168 K

文摘

To improve the severe hot tearing susceptibility of TiB₂ reinforced Al-5Cu matrix composites, the present research investigated the influence of Y on the hot tearing susceptibility of 6TiB₂/Al-5Cu composite. For the composite added with Y, the solidification temperature range was shortened, which was caused by the novel τ₁-Al₈Cu₄Y phase. The grain size of 6TiB₂/Al-5Cu composite was 39.8 µm. The addition of Y promoted the grain refinement, and the grain sizes were 36.33, 33.42 and 26.77 µm for 6TiB₂/Al-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/Al-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 6TiB₂/Al-5Cu with 0.2 wt.%, 0.5 wt.% and 1 wt.% Y, accordingly.