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Open AccessArticle

Dendrite Morphology Evolution of Al6Mn Phase in Suction Casting Al–Mn Alloys

by Zhongwei Chen 1,*, Yue Hou 1, Bin Xie 2 and Qi Zhang 1
1
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
2
Wuhan BOE Optoelectronics Technology Co., Ltd., No.691 Linkonggang Road, Dongxihu District, Wuhan 430040, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(10), 2388; https://doi.org/10.3390/ma13102388
Received: 25 April 2020 / Revised: 11 May 2020 / Accepted: 13 May 2020 / Published: 22 May 2020
The effects of solute element content and cooling rate on the morphology of Al6Mn phase in suction casting Al–Mn alloys were investigated by transmission electron microscope, scanning electron microscope, and X-ray diffractometer. Results show that Al6Mn dendrite morphology with different degrees of development can occur in the microstructure of as-cast Al–Mn alloys. For the Al–4 wt.% Mn alloy, there are small amounts of block Al6Mn crystals at the center of sample, while we see a block Al6Mn phase and a feathery Al6Mn phase in the sample of Al–6 wt.% Mn alloy. Moreover, the block Al6Mn phases in the Al–8 wt.% Mn alloy disappear, and only snowflake-like Al6Mn phases play a dominant role in the microstructure. However, with an increase in Mn content to 10 wt.%, more dendritic trunks are formed, and secondary dendrite arms are degraded more seriously due to the formation of an icosahedral quasicrystal in suction casting. In addition to the effect of Mn content on Al6Mn morphology, with the increase in cooling rate from the center to the edge of samples, the outline diameter of equiaxed dendrite decreases. The evolution of Al6Mn dendrite morphology and the formation of quasicrystal are further discussed. View Full-Text
Keywords: Al–Mn alloys; suction casting; dendrite morphology; icosahedral quasicrystal Al–Mn alloys; suction casting; dendrite morphology; icosahedral quasicrystal
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MDPI and ACS Style

Chen, Z.; Hou, Y.; Xie, B.; Zhang, Q. Dendrite Morphology Evolution of Al6Mn Phase in Suction Casting Al–Mn Alloys. Materials 2020, 13, 2388.

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