Influence of heat treatment on fatigue behaviour of high-strength Mg-10Gd-3Y alloy

J. Dong, W. C. Liu, X. Song, P. Zhang, W. J. Ding, A. M. Korsunsky

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

The current work investigated the influence of heat treatment (T4, T5 and T6) on high cycle fatigue (HCF) behaviour of the as-extruded Mg-10Gd-3Y (GW103, wt.%) alloy. The five heat treatment conditions applied to the as-extruded GW103 alloy were under-aging (T5, 225°C×4h), peak-aging (T5, 225°C×10h), over-aging (T5, 225°C×250h), solution treatment (T4, 500°C×4h), solution treatment plus artificial aging (T6, 500°C×4h+225°C×10h), respectively. The results showed that T5 heat treatment can improve the fatigue behaviour of the GW103 alloy, while T4 and T6 heat treatments are detrimental to the fatigue behaviour of the GW103 alloy. The 107 cycles fatigue strength of the GW103 alloy made by peak-aging was improved by approximately 10%, compared with the as-extruded. While, the fatigue strength of the under-aged and over-aged GW103 alloys have no obvious difference, although fatigue life of the under-aged GW103 alloy is slightly higher than that of the over-aged GW103 alloy at high stress amplitude. The extruded-T4 and extruded-T6 GW103 alloys exhibit similar fatigue strengths of 110MPa. The influence mechanism of heat treatment on HCP behaviour of the as-extruded GW103 alloy was discussed.

Original languageEnglish
Pages (from-to)6053-6063
Number of pages11
JournalMaterials Science and Engineering A
Volume527
Issue number21-22
DOIs
Publication statusPublished - Aug 2010
Externally publishedYes

Keywords

  • Heat treatment
  • High cycle fatigue
  • Magnesium alloy
  • Mg-10Gd-3Y

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