An Investigation on Hot Tearing of Mg-4.5Zn-(0.5Zr) Alloys with Y Additions

Research output: Journal contributionsJournal articlesResearchpeer-review

Authors

  • Zhi Wang
  • Jiangfeng Song
  • Yuanding Huang
  • Amirthalingam Srinivasan
  • Zheng Liu
  • Karl Ulrich Kainer
  • Norbert Hort

In this work, the hot tearing susceptibility (HTS) of Mg-4.5Zn-xY (x = 0, 0.4, 0.9, 2 wt pct) alloys is investigated using constrained rod casting apparatus equipped with a load cell and data acquisition system. The effect of grain refinement by Zr addition on the HTS has also been investigated. The results show that the HTS first increases with increasing the Y content, reaches the maximum at 0.9 wt pct Y, and then reduces with further increase in the Y content to 2.0 wt pct. The high HTS observed in the alloys with 0.4 and 0.9 wt pct Y is attributed to their coarse columnar grains and their large freezing ranges. The results also suggest that the resistance to the hot tearing can apparently be improved by increasing the initial mold temperature. In addition, a fine microstructure reduces the HTS. Numerical simulations using ProCAST software on HTS of Mg-4.5Zn-xY alloys are in good agreement with the experimental results.

Original languageEnglish
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume46
Issue number5
Pages (from-to)2108-2118
Number of pages11
ISSN1073-5623
DOIs
Publication statusPublished - 01.05.2015
Externally publishedYes