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Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting

In this study, large-sized Al–Zn–Mg–Cu alloy billets were prepared by direct chill casting imposed with annular electromagnetic stirring and intercooling; a process named uniform direct chill casting. The effects of uniform direct chill casting on grain size and the alloying element distribution of...

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Autores principales: Zhou, Li, Luo, Yajun, Zhang, Zhenlin, He, Min, Xu, Yinao, Zhao, Yulei, Liu, Sheng, Dong, Lijun, Zhang, Zhifeng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7913293/
https://www.ncbi.nlm.nih.gov/pubmed/33546222
http://dx.doi.org/10.3390/ma14040708
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author Zhou, Li
Luo, Yajun
Zhang, Zhenlin
He, Min
Xu, Yinao
Zhao, Yulei
Liu, Sheng
Dong, Lijun
Zhang, Zhifeng
author_facet Zhou, Li
Luo, Yajun
Zhang, Zhenlin
He, Min
Xu, Yinao
Zhao, Yulei
Liu, Sheng
Dong, Lijun
Zhang, Zhifeng
author_sort Zhou, Li
collection PubMed
description In this study, large-sized Al–Zn–Mg–Cu alloy billets were prepared by direct chill casting imposed with annular electromagnetic stirring and intercooling; a process named uniform direct chill casting. The effects of uniform direct chill casting on grain size and the alloying element distribution of the billets were investigated and compared with those of the normal direct chill casting method. The results show that the microstructures were refined and the homogeneity of the alloying elements distribution was greatly improved by imposing the annular electromagnetic stirring and intercooling. In uniform direct chill casting, explosive nucleation can be triggered, originating from the mold wall and dendrite fragments for grain refinement. The effects of electromagnetic stirring on macrosegregation are discussed with consideration of the centrifugal force that drives the movement of melt from the central part towards the upper-periphery part, which could suppress the macrosegregation of alloying elements. The refined grain can reduce the permeability of the melt in the mushy zone that can restrain macrosegregation.
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spelling pubmed-79132932021-02-28 Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting Zhou, Li Luo, Yajun Zhang, Zhenlin He, Min Xu, Yinao Zhao, Yulei Liu, Sheng Dong, Lijun Zhang, Zhifeng Materials (Basel) Article In this study, large-sized Al–Zn–Mg–Cu alloy billets were prepared by direct chill casting imposed with annular electromagnetic stirring and intercooling; a process named uniform direct chill casting. The effects of uniform direct chill casting on grain size and the alloying element distribution of the billets were investigated and compared with those of the normal direct chill casting method. The results show that the microstructures were refined and the homogeneity of the alloying elements distribution was greatly improved by imposing the annular electromagnetic stirring and intercooling. In uniform direct chill casting, explosive nucleation can be triggered, originating from the mold wall and dendrite fragments for grain refinement. The effects of electromagnetic stirring on macrosegregation are discussed with consideration of the centrifugal force that drives the movement of melt from the central part towards the upper-periphery part, which could suppress the macrosegregation of alloying elements. The refined grain can reduce the permeability of the melt in the mushy zone that can restrain macrosegregation. MDPI 2021-02-03 /pmc/articles/PMC7913293/ /pubmed/33546222 http://dx.doi.org/10.3390/ma14040708 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhou, Li
Luo, Yajun
Zhang, Zhenlin
He, Min
Xu, Yinao
Zhao, Yulei
Liu, Sheng
Dong, Lijun
Zhang, Zhifeng
Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting
title Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting
title_full Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting
title_fullStr Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting
title_full_unstemmed Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting
title_short Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting
title_sort microstructures and macrosegregation of al–zn–mg–cu alloy billet prepared by uniform direct chill casting
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7913293/
https://www.ncbi.nlm.nih.gov/pubmed/33546222
http://dx.doi.org/10.3390/ma14040708
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