Creep Behavior and Microstructures in Grain Boundary Strengthened Mg-Al-Ca Thixomolded® Alloys

Mayumi  Suzuki; Akihiro Shibata; Kouichi Maruyama

doi:10.4028/www.scientific.net/MSF.706-709.1249

Paper Titles

Improvement in Mechanical Properties of Coarse-Grained AZ61 Mg Alloy by Multidirectional Forging and Ultrafine Grain Refinement
p.1227

Effect of Grain Size on Fatigue Crack Propagation in Extruded AZ31 Magnesium Alloys
p.1233

Effect of Long-Period Stacking Order Phase and α-Mg Phase on Strength and Ductility of Mg-Zn-Y Alloy
p.1237

Microstructure of the High-Strength Magnesium Alloy on Cylinder Upsetting
p.1243

Creep Behavior and Microstructures in Grain Boundary Strengthened Mg-Al-Ca Thixomolded^® Alloys
p.1249

Evolution of Texture and Microstructure of AZ31 Mg Alloy Sheet at High Strain Rates
p.1255

Microstructure and Mechanical Properties of Magnesium Alloy Prepared by Repetitive Upsetting
p.1261

Grain Refinement of Mg-Al-Zn Alloy Bar during Hot Compression
p.1267

Process-Structure-Property Relationships for Magnesium Alloys
p.1273

HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Creep Behavior and Microstructures in Grain...

Creep Behavior and Microstructures in Grain Boundary Strengthened Mg-Al-Ca Thixomolded^® Alloys

Abstract:

The microstructures of thixomolded^® (TM) Mg-Al-Ca alloys consist of α-Mg and eutectic compounds along grain boundaries. Misch metal (Mm) addition to TM Mg-Al-Ca alloys makes precipitates within α-Mg matrix and their number density and size depend on heat-treatment conditions. The small addition of Mm can keep the network-like grain boundary covering and the improvement of microstructure stability during creep. On the other hand, excessive Mm addition causes the deterioration of creep strength. The grain boundary coverage decreases with increasing Mm content due to the formation of coarse spherical Al-Mm based intermetallic compounds. Creep strength is significantly affected by both of the grain boundary coverage and the morphology of eutectic compounds along grain boundaries.

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Periodical:

Materials Science Forum (Volumes 706-709)

Pages:

1249-1254

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.1249

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Online since:

January 2012

Authors:

Mayumi Suzuki, Akihiro Shibata, Kouichi Maruyama

Keywords:

Creep Strength, Grain Boundary Coverage, Intragranular Precipitates, Mg-Al-Ca Based Alloys, Thixomolding^® Process

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