Metallurgical and Materials Transactions A

, Volume 37, Issue 4, pp 1333–1341

Effect of strontium on the microstructure, mechanical properties, and fracture behavior of AZ31 magnesium alloy

  • Xiaoqin Zeng
  • Yingxin Wang
  • Wenjiang Ding
  • Alan A. Luo
  • Anil K. Sachdev
Article

DOI: 10.1007/s11661-006-1085-8

Cite this article as:
Zeng, X., Wang, Y., Ding, W. et al. Metall and Mat Trans A (2006) 37: 1333. doi:10.1007/s11661-006-1085-8

Abstract

The effect of strontium (Sr) on the microstructure, mechanical properties, and fracture behavior of AZ31 magnesium alloy and its sensitivity to cooling rate are investigated. Three phases—blocky-shaped Mg17Al12, acicular Mg20Al20Mn5Sr, and insular Mg16(Al,Zn)2Sr—are identified in the Sr-containing AZ31 alloys. With increasing cooling rate, the blocky-shaped Mg17Al12 phase increases, the acicular Mg20Al20Mn5Sr phase diminishes, and the insular Mg16(Al,Zn)2Sr phase is refined and granulated. The study suggests that the grain size decreases with increasing cooling rate for a given composition. However, the grain size decreases first, then increases, and finally decreases again with increasing Sr for a given cooling rate. The yield strength (σy) of AZ31 magnesium alloy can be improved by grain refinement and expressed as σy=35.88+279.13d−1/2 according to the Hall-Petch relationship. The elongation increases when Sr is added up to 0.01 pct and then decreases with increasing Sr addition. Grain refinement changes the fracture behavior from quasicleavage failure for the original AZ31 alloy to mixed features of quasicleavage and microvoid coalescence fracture.

Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2006

Authors and Affiliations

  • Xiaoqin Zeng
    • 1
  • Yingxin Wang
    • 1
  • Wenjiang Ding
    • 1
  • Alan A. Luo
    • 2
  • Anil K. Sachdev
    • 2
  1. 1.National Engineering Research Center of Light Alloys Net FormingShanghai Jiao Tong UniversityShanghaiP.R. China
  2. 2.Materials and Processes Laboratory at General Motors Research and Development CenterWarren

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