Effect of Rapid Solidification on the Structure and Mechanical Properties of AZ91 Magnesium Alloy

Tomasz Tokarski

doi:10.4028/www.scientific.net/SSP.186.120

Paper Titles

Microstructure of the Ni-W Solid Solution Prepared by Levitation and after High Pressure Torsion Severe Plastic Deformation
p.104

Near Grain Boundary Behavior of Aluminum Bicrystals Deformed in Plane Strain Conditions
p.108

Microstructure and Texture Evolutions in AA1200 Aluminum Alloy Deformed by Accumulative Roll Bonding Method
p.112

Gradient Microstructure of FeCr30Co8 Hard Magnetic Alloy Subjected to Plastic Deformation by Tension Combined with Torsion at 700 and 720°C
p.116

Effect of Rapid Solidification on the Structure and Mechanical Properties of AZ91 Magnesium Alloy
p.120

Microstructure of LaNi₅ Base Nanopowders Produced by High Energy Ball Milling
p.124

Microstructure of AgNi and AgSnBi Powders Consolidated by CEC
p.130

Correlation between SEM and X-Ray Diffraction Imaging of Defect Structure in Single-Crystal Ni-Based Superalloy
p.135

TEM Analyses of Microstructure Evolution in Ex-Service Single Crystal CMSX-4 Gas Turbine Blade
p.139

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Effect of Rapid Solidification on the Structure and Mechanical Properties of AZ91 Magnesium Alloy

Abstract:

The present paper reports an experimental investigation of rapid solidification (RS) influence on the structure and mechanical properties of commercial AZ91 magnesium alloy. In order to obtain RS material melt spinning process was applied in protective atmosphere, resulting in formation of 50 to 100 μm thickness RS ribbons. Application of plastic consolidation (PC) by hot extrusion to the highly fragmented magnesium strips allowed to obtain high bulk strength material. It was found that yield strength (YS) and ultimate tensile strength (UTS) of RS+PC material with comparison to the cast and extruded samples were increased from 220 MPa to 303 MPa and from 287 MPa to 385 MPa, respectively, while plasticity of the RS material was slightly decreased. It was noticed that the grain size of both materials was at the same level of 2 μm, thus higher mechanical properties of RS material was ascribed to dispersion strengthening caused by the high amount of fine (below 50 nm in diameter) Mg₁₇Al₁₂ phases evenly distributed in the material structure.