Crystallographic Features of a Solidified Hypoeutectic Zn-4.45%Al Alloy

doi:10.11901/1005.3093.2013.359

Chinese Journal of Materials Research

2014, Vol. 28

Issue (2): 126-132 DOI: 10.11901/1005.3093.2013.359

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Crystallographic Features of a Solidified Hypoeutectic Zn-4.45%Al Alloy

Lei LI(

),Ke QIN,Haitao ZHANG,Zhihao ZHAO,Qingfeng ZHU,Yubo ZUO,Jianzhong CUI

Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819

Cite this article:

Lei LI,Ke QIN,Haitao ZHANG,Zhihao ZHAO,Qingfeng ZHU,Yubo ZUO,Jianzhong CUI. Crystallographic Features of a Solidified Hypoeutectic Zn-4.45%Al Alloy. Chinese Journal of Materials Research, 2014, 28(2): 126-132.

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Abstract

A hypoeutectic Zn-4.45 mass%Al alloy was molten and then slowly solidified in an electrical furnace. The microstructure and the relevant crystallographic feature on longitudinal section of the solidified alloy ingot were characterized by means of SEM with EBSD technique. The results show that feather-like structure consisted of some elongated eutectic colonies is developed in the upper part of the specimen and a specific crystallographic orientation relationship (OR) () exists between β and αin the eutectic colonies. Moreover, the primary β dendrites are segregated in the lower part of the specimen with a flat morphology: six primary arms grow quickly along but slowly along <0001>. In addition, some αprecipitates are present in the interior of primary β dendrites, and there exists certain OR between β and α as that mentioned above. However, no specific OR is found between the primary β dendrites and their attached pseudo-primary αphase as well as between the adjacent eutectic β and α.

Key words: foundational discipline in materials science solidification microstructure crystallography EBSD

Received: 28 May 2013

Fund: *Supported by National Natural Science Foundation of China No. 51201029 and China Postdoctoral Science Foundation No. 2012M520637.

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	Lei LI
	Ke QIN
	Haitao ZHANG
	Zhihao ZHAO
	Qingfeng ZHU
	Yubo ZUO
	Jianzhong CUI

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.359 OR https://www.cjmr.org/EN/Y2014/V28/I2/126

Fig.1 Macrostructure in the longitudinal section of the specimen (a) upper part and (b) lower part

Feather-like microstructure (a) in the upper part of the specimen, the pole figures of (b) {0001}, {111} and (c)< 1 2 ? 10 >, <110> corresponding to the lamellar eutectic b and α phases respectively. Axes X and Y are the defined two-dimensioned coordinate system of the observation plane

Fig.3 Microstructure in the lower part of the specimen

Fig.4 SEM images of primary β phase with (a) dendritic and (b) columnar forms, crystallographic growth directions of primary b phase (c) denoted on the hexagonal structure and internal Al-rich αprecipitates in primary β phase (d). The figures below the SEM images are the <0001> and< 10 1 ? 0 >direction pole figures corresponding to the primary β phase in (a) and (b), respectively, and those below (c) and (d) are the {0001}, {111} and < 1 2 ? 10 >, <110> pole figures corresponding to the primary β phase and the internal αprecipitates in (d), respectively.

Fig.5 SEM images of (a) primary α phase with the adjacent eutectic structures and (b) foot-like morphology composed of primary β phase and the adjacent toe-like eutectic structure. The contrast orientation map in (a) corresponds to the SEM image and the < 1 2 ? 10 > and <110> pole figures below the SEM image in (a) correspond to the eutectic β and α phases, respectively.

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