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

Tomáš Krajňák, Peter Minárik, Jitka Stráská, Jenő Gubicza, Luděk Dluhoš, Kristián Máthis, Miloš Janeček

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 { 10 1 ¯ 0 } 11 2 ¯ 0 prismatic and { 10 1 ¯ 1 } 11 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.

Original languageEnglish
Pages (from-to)3118-3129
Number of pages12
JournalJournal of Materials Science
Volume55
Issue number7
DOIs
Publication statusPublished - Mar 1 2020

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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