THE EFFECT OF SEVERE PLASTIC DEFORMATION ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AS-CAST AZ31

Authors

  • H. Palkowski Institute of Metallurgy, Clausthal University of Technology
  • H. R. Samim School of Materials and Metallurgical Engineering, Iran University of Science and Technology
  • M. R. Aboutalebi Center of Excellence for Advanced Materials and Processing (CEAMP), School of Materials and Metallurgical Engineering, Iran University of Science and Technology
  • M. T. Salehi School of Materials and Metallurgical Engineering, Iran University of Science and Technology
  • S. Khani School of Materials and Metallurgical Engineering, Iran University of Science and Technology
Abstract:

The evolution of microstructure and mechanical properties of a magnesium cast alloy (AZ31) processed by equal channel angular pressing (ECAP) at two different temperatures were investigated. The as-cast alloy with an average grain size of 360  was significantly refined to about 5  after four ECAP passes at 543 K. Grain refinement was achieved through dynamic recrystallization (DRX) during the ECAP process in which the formation of necklace-type structure and bulging of original grain boundaries would be the main mechanisms. ECAP processing at lower temperature resulted in finer recrystallized grains and also a more homogenous microstructure. The mechanical behavior was investigated at room temperature by tensile tests. The obtained results showed that the ECAP processing can basically improve both strength and ductility of the cast alloy. However, the lower working temperature led to higher yield and ultimate strength of the alloy.

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Journal title

volume 13  issue 3

pages  29- 38

publication date 2016-09

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