Affordable Access

deepdyve-link
Publisher Website

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

Authors
  • Zhou, Li1
  • Luo, Yajun1
  • Zhang, Zhenlin2
  • He, Min2
  • Xu, Yinao1
  • Zhao, Yulei1
  • Liu, Sheng1
  • Dong, Lijun1
  • Zhang, Zhifeng3
  • 1 Hunan Engineering Research Center of New Energy Vehicle Lightweight, Hunan Institute of Engineering, Xiangtan 411104, China. , (China)
  • 2 Wenchang New Material Technology Co. Ltd., Loudi 417000, China. , (China)
  • 3 General Research Institute for Non-Ferrous Metals, Beijing 100088, China. , (China)
Type
Published Article
Journal
Materials
Publisher
MDPI AG
Publication Date
Feb 03, 2021
Volume
14
Issue
4
Identifiers
DOI: 10.3390/ma14040708
PMID: 33546222
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

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.

Report this publication

Statistics

Seen <100 times