The role of microstructure and texture in controlling mechanical properties of AZ31B magnesium alloy processed by I-ECAP

Gzyl, Michal and Rosochowski, Andrzej and Boczkal, Sonia and Olejnik, Lech (2015) The role of microstructure and texture in controlling mechanical properties of AZ31B magnesium alloy processed by I-ECAP. Materials Science and Engineering: A, 638. ISSN 0921-5093

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    Abstract

    Abstract Mechanical properties of AZ31B magnesium alloy were modified in this work by various processing routes of incremental equal channel angular pressing (I-ECAP) followed by heat treatment. Possible strategies for improving ductility and strength of the alloy were investigated. Processing by routes A and BC showed that texture plays predominant role in controlling mechanical properties at room temperature. Four passes of I-ECAP by route C followed by annealing enhanced ductility up to 0.35 of true strain. It was found that tensile twinning was important in accommodating strain during tensile testing, which resulted in a very good hardening behaviour. The yield strength was improved to 300 MPa by refining grain size to 0.8 µm in I-ECAP at 150 °C. The obtained structure and properties were shown to be stable up to 150 °C. True strain at fracture was increased to 0.2 after annealing at 150 °C without lowering strength.