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Influence of temperature of ECAP processing on the microstructure and microhardness of as-cast AX41 alloy

  • Tomáš KrajňákEmail author
  • Peter Minárik
  • Jitka Stráská
  • Jenő Gubicza
  • Luděk Dluhoš
  • Kristián Máthis
  • Miloš Janeček
Metals & corrosion
  • 4 Downloads

Abstract

The influence of the temperature of ECAP processing on the microstructure and mechanical properties of commercial as-cast AX41 magnesium was investigated. ECAP processing was conducted at temperatures of 220 °C and 250 °C up to N = 8 passes via route Bc. The original grain size of 200 μm was found to decrease with increasing number of passes at both temperatures. After 8 passes, the grain size of 1.4 μm and 2.6 μm was obtained at 220 °C and 250 °C, respectively. This difference was attributed to the suppressed dynamic recrystallization for N > 2 caused by substantial decrease in dislocation density of \( \left\{ {10\bar{1}0} \right\}11\bar{2}0 \) prismatic and \( \left\{ {10\bar{1}1} \right\}11\bar{2}3 \) pyramidal <a>-type edge dislocations and more pronounced high-temperature grain growth at 250 °C. Despite the different grain sizes, similar crystallographic textures and dislocation densities were observed at both temperatures after 8 passes. The microhardness values increased up to 4 passes at both temperatures in accordance with the variation of the grain size, indicating the dominance of Hall–Petch strengthening.

Notes

Acknowledgements

This work was financially supported by the Czech Science Foundation under the Project 19-00270S. Financial support by ERDF under the Project CZ.02.1.01/0.0/0.0/15_003/0000485 is also gratefully acknowledged. J.G. acknowledges financial support by the Ministry of Human Capacities of Hungary within the ELTE University Excellence Program (1783-3/2018/FEKUTSRAT).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Faculty of Mathematics and PhysicsCharles UniversityPraha 2Czech Republic
  2. 2.Department of Materials PhysicsEötvös Loránd UniversityBudapestHungary

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