Investigations on hot tearing of Mg-Al binary alloys by using a new quantitative method

Research output: Contributions to collected editions/worksArticle in conference proceedingsResearchpeer-review

Authors

  • Zisheng Zhen
  • Norbert Hort
  • Oliver Utke
  • Yuanding Huang
  • Nikoli Petri
  • Karl Ulrich Kainer

Hot tearing, also referred as hot cracking, is a commonly encountered solidification defect during castings. Although it has been extensively investigated for decades, most contributions are still based on qualitative characterizations. In this work, a quantitative method to investigate hot tearing has been developed, based on the measurement of contraction force. The advantage of the present evaluation system, which is mainly different from previous apparatus, is to eliminate the influence of friction between the mould and casting rod., The results obtained using this system demonstrate good repeatability and reliability. The measured contraction force has been proved to be able to evaluate the ho1: tearing susceptibility as a more straightforward and quantitative index. By analyzing the contraction force curve, both the initiation and propagation of hot tear can be detected. With this method, the hot tearing of Mg-Al binary alloys has been investigated. The results show that increasing the mould temperature decreases the hot tearing susceptibility, meanwhile increases the temperature of the hot tearing initiation. The contraction force curves also indicate that the liquid refilling plays an important role in the formation of hot tearing. With a lower cooling rate, the remained liquid possibly refills the initiated hot crack, and consequently partially or completely heals the cracks.

Original languageEnglish
Title of host publicationMagnesium Technology 2009
EditorsEric A. Nyberg, Sean R. Agnew, Neale R. Neelameggham, Mihriban O. Pekguleryuz
Number of pages6
PublisherJohn Wiley & Sons Inc.
Publication date2009
Pages105-110
ISBN (print)9780873397308, 0873397304
Publication statusPublished - 2009
Externally publishedYes
EventMagnesium Technology 2009 - San Francisco, CA, United States
Duration: 15.02.200919.02.2009

    Research areas

  • Castability, Crack formation, Hot tearing, Magnesium alloys
  • Engineering