Tensile Behavior of Mg-Nd-Zn-Zr Alloy at Medium and High Temperature

Abstract:

The tensile deformation behavior and microstructure evolution of Mg-Nd-Zn-Zr alloys at solid solution condition was studied during the tensile tested at medium and high temperature. The result showed that, in medium temperature range (≤250^οC), serrated flow was observed. With the temperature increasing, the critical strain decreased, the serration became more intensive, and the type of serration changed from type A to type A+B, finally to type B. At temperature of 250 ^οC, where serrated flows become most obvious, a large number of precipitated phases in slip band were found in micrographs. The strength reached a high peak and the ductility stay at low ebb in mechanical perspective. When tensile tested at high temperature ranging from 300 ^οC to 400^οC, serrated flow disappeared and the ductility increased profoundly with the temperature increasing, and then approached to super-plasticity. In addition, the deformation mechanism, at medium and high temperature, has been discussed by calculating the activation energy.

• Periodical: Materials Science Forum (Volume 816)
• Pages: 362-369
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.816.362
• Online since: April 2015
• Authors: W.H. Wang*, D. Wu, Rongshi Chen, Chang Sheng Lou
• Keywords: High Temperature Deformation, Magnesium Alloys, Portevin–Le Chatelier Effect, Tensile Properties

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