金属学报  2012, Vol. 48 Issue (1): 33-40    DOI: 10.3724/SP.J.1037.2011.00450

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定向凝固Al-40%Cu合金三维微观组织重构及共晶间距演变

赵朋, 李双明, 傅恒志

西北工业大学凝固技术国家重点实验室, 西安 710072

THREE-DIMENSIONAL MICROSTRUCTURE RECONSTRUCTION AND THE EUTECTIC SPACING ADJUSTMENT DURING DIRECTIONAL SOLIDIFICATION OF Al-40%Cu HYPEREUTECTIC ALLOY

ZHAO Peng, LI Shuangming, FU Hengzhi

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072

赵朋 李双明 傅恒志. 定向凝固Al-40%Cu合金三维微观组织重构及共晶间距演变[J]. 金属学报, 2012, 48(1): 33-40.
, , . THREE-DIMENSIONAL MICROSTRUCTURE RECONSTRUCTION AND THE EUTECTIC SPACING ADJUSTMENT DURING DIRECTIONAL SOLIDIFICATION OF Al-40%Cu HYPEREUTECTIC ALLOY[J]. Acta Metall Sin, 2012, 48(1): 33-40.

摘要 参考文献 相关文章 Metrics 全文: PDF(5057 KB)   摘要: 本文利用连续切片技术研究了定向凝固Al-40%Cu过共晶合金中金属间化合物Al2Cu 初生相的三维微观组织, 以及抽拉速率跃迁下, 三维共晶组织形态的演变和间距调整. 结果表明: 抽拉速率为5 µm/s时, 初生Al2Cu三维组织沿生长方向存在棱面和棱角, 表现出明显的棱面相生长形态; 凝固过程中初生Al2Cu相释放的结晶潜热使得生长界面发生局部重熔, 三维组织中出现孔洞, 形成拓扑缺陷. 在Al-40%Cu合金三维共晶组织中,  Al2Cu 相和Al相的体积分数分别为56.8%和43.2%, 且Al2Cu相的生长方向与试样轴向夹角为5.1o. 当抽拉速率从2 μm/s突然跃迁到500 μm/s时, 三维共晶组织形态从层片向棒状转变, 这种转变不是由合金中两相体积分数变化造成的. 三维共晶组织间距调整机制不同于二维组织中的分叉、内凹和界面重新形核, 而是通过三维空间非同一平面连续的分叉、分枝进行, 在三维下并没有观察到二维下的重新形核共晶间距调整机制. 关键词 ： 连续切片技术,  三维组织重构,  定向凝固,  初生Al2Cu相,  共晶组织     Abstract：Three-dimensional (3D) microstructures can clearly reveal the size, shape and distribution of the phases, providing a novel way to deeply understand the formation mechanism of the solidified phases. In this paper, by using the serial sectioning technique, the 3D microstructure of the primary Al2Cu phase was reconstructed and the eutectic spacing adjustment was investigated during directional solidification of Al-40%Cu hypereutectic alloy. The results show that the primary Al2Cu phase pattern was observed faceting due to the growing faceted angle and plane parallel to the solidification direction at the pulling rate of 5 μm/s. Further, there existed some hopper-like cavities in the 3D microstructure of the primary Al2Cu phase that caused by remelting owing to a large amount of the latent heat difficult to be extracted from the solidification interface. For the 3D eutectic microstructures of the Al-40%Cu alloy, the growth direction of the Al and Al2Cu phases in the coupled eutectics had a deviation angle of 5.1o with the heat flux direction and the phase volume fractions of the  Al and Al2Cu phases were measured directly to be 56.8% and 43.2%, respectively. In addition, at the abrupt change in pulling rate from 2 μm/s to 500 μm/s, the lamellar-to-rod eutectic transition was observed and the continuously splitting and branching occurred in different planes responsible for the eutectic spacing adjustment in the 3D microstructure of the Al-40%Cu alloy. Meanwhile the renuleation mechanism in the 2D microstructure for the adjustment of the eutectic spacing did not work in the 3D eutectic microstructure of the Al-40%Cu alloy. Key words： serial sectioning technique    three-dimensional microstructure reconstruction    directional solidification    primary Al2Cu phase    eutectic microstructure 收稿日期: 2011-07-15      ZTFLH:  TG111.4   基金资助: 国家自然科学基金项目50971101和51074127及西北工业大学基础研究基金项目JC201029资助 作者简介: 赵朋, 男, 1987年生, 硕士生 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 李双明 赵朋 傅恒志 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2011.00450      或      https://www.ams.org.cn/CN/Y2012/V48/I1/33 [1] Spanos G. 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