Acta Metall Sin  2012, Vol. 48 Issue (1): 33-40    DOI: 10.3724/SP.J.1037.2011.00450

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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

ZHAO Peng LI Shuangming FU Hengzhi. THREE-DIMENSIONAL MICROSTRUCTURE RECONSTRUCTION AND THE EUTECTIC SPACING ADJUSTMENT DURING DIRECTIONAL SOLIDIFICATION OF Al-40%Cu HYPEREUTECTIC ALLOY. Acta Metall Sin, 2012, 48(1): 33-40.

Abstract References Related Articles Recommended Metrics Download:  PDF(5057KB)  Export:  BibTeX | EndNote (RIS)       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      Received:  15 July 2011      ZTFLH:  TG111.4   Fund:  Supported by National Natural Science Foundation of China (Nos.50971101 and 51074127) and Basic Research Foundation of NWPU (No.JC201029) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors LI Shuang-Meng DIAO Peng FU Heng-Zhi URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00450     OR     https://www.ams.org.cn/EN/Y2012/V48/I1/33 [1] Spanos G. Scr Mater, 2006; 55: 3 [2] Isheim D, Kolli R P, Fine M E, Seidman D N. Scr Mater, 2006; 55: 35 [3] Liu H H, Schmidt S, Poulsen H F, Godfrey A, Liu Z Q, Sharon J A, Huang X. Science, 2011; 332: 833 [4] Khor K H, Buffiere J Y, Ludwig W, Sinclair I. Scr Mater, 2006; 55: 47 [5] Spowart J E. Scr Mater, 2006; 55: 5 [6] Mendoza R, Savin I, Thornton K, Voorhees P W. 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