Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 799, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.140158
Keywords
Magnesium alloys; High-pressure torsion; AM60; Shear punch test; Texture; Hardness
Categories
Funding
- Ministry of Human Capacities of Hungary within the ELTE University Excellence program [1783-3/2018/FEKUTSRAT]
- Operational Programme Research, Development and Education, The Ministry of Education, Youth and Sports (OP RDE, MEYS) [CZ.02.1.01/0.0/0.0/16_013/0001794]
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The microstructure and hardness of AM60 magnesium alloy processed by high-pressure torsion (HPT) technique were studied, showing a refinement in grain size and an increase in hardness with the number of HPT turns. The dislocation density saturated after 1/2 turn. Despite a slight difference between hardness and yield strength, a good agreement was observed between them.
The evolution of the microstructure, crystallographic texture and hardness of an AM60 magnesium alloy was studied in the center and the edge parts of disks processed by high-pressure torsion (HPT) technique at room temperature. In addition, the mechanical properties were also tested by shear punch test (SPT). The number of HPT turns varied between 1/2 and 10. It was found that the grain size of the initial extruded material (similar to 16 mu m) decreased to similar to 2 and similar to 0.8 mu m at the disk center and edge, respectively, even after 1/2 turn of HPT. Ten turns of HPT resulted in further grain refinement to similar to 1 and similar to 0.23 mu m at the disk center and edge, respectively. The dislocation density saturated even after 1/2 turn with the value of similar to 11 x 10(14) m(-2). The maximum value of the hardness was similar to 1300 MPa that was measured at the edge of the disk deformed for 1/2 turn. Despite the practically unchanged grain size and dislocation density, the hardness decreased between 3 and 10 turns which can be explained by texture softening. A good agreement was observed between the yield strength estimated as one-third of the hardness and the values calculated from the dislocation density, grain size and texture. The difference between the microstructure and hardness obtained for AM60 samples processed by HPT and equal channel angular pressing (ECAP) is discussed.
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