Microstructure and Dynamic Ultra-Micro Hardness of the As-Cast and Extruded Mg-Al-Ca-Sm Alloys

Hyeon Taek Son; Jae Seol Lee; Ji Min Hong; Dae Guen Kim; Kyosuke Yoshimi; Kouichi Maruyama

doi:10.4028/www.scientific.net/AMR.26-28.153

Paper Titles

Heat Resistance of Mg-Nd Based Casting Alloys Containing Gadolinium and Yttrium
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Effect of Ca and Sr Content on Elevated Temperatures Mechanical Properties of a Cast AZ91 Magnesium Alloy
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Mechanical Properties of Twin Roll Cast AZ91 Magnesium Alloy at Room Temperature
p.145

Influence of Initial Texture on Twin Formation and Plastic Deformation of Rolled AZ31 Mg Alloy
p.149

Microstructure and Dynamic Ultra-Micro Hardness of the As-Cast and Extruded Mg-Al-Ca-Sm Alloys
p.153

HRTEM Observation of the Age Hardening Precipitates in Mg-Zn Alloy
p.157

Continuous Rheological Forming of A6061 Wrought Aluminum Alloy by Using Helical Shape Stirrer and its Thixoforging Process
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Effect of Heat Treatment on Microstructures and Properties of Mg-9Gd-4Y-0.3Zr Alloy
p.167

Titanium Hydriding and Consolidation for Recycling of Titanium Tuning Chip
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 26-28Microstructure and Dynamic Ultra-Micro Hardness of...

Microstructure and Dynamic Ultra-Micro Hardness of the As-Cast and Extruded Mg-Al-Ca-Sm Alloys

Abstract:

The as-cast microstructure of Mg-5Al-3Ca-2Sm alloy consists of equiaxed α-Mg matrix, (Mg, Al)2Ca eutectic phase and Al-Sm rich intermetallic compounds. This eutectic phase of the extruded alloys was elongated to extrusion direction and size of this phase was finered compare to that of as-cast alloys because of severe deformation during hot extrusion. After hot extrusion, the average grain size of Mg-5Al-3Ca and Mg-5Al-3Ca-2Sm alloys was 4.8 *m and 3.8 *m, respectively. In load-unload hardness test, penetration depth was decreased with added Sm and after extrusion procedure because of grain size refining by addition Sm and large deformation. Hardness value of the alloys containing Sm was higher than that of Mg-5Al-3Ca alloy due to grain refining and formation Al-Sm rich intermetallic compound at gain boundary and α-Mg matrix. Maximum hardness value was obtained at the extruded Mg-5Al-3Ca-2Sm alloy at elevated temperatures.