TEM Study of a Creep-Resistant Mg-5Al-2Sr Alloy after Semisolid Molding

Frank Czerwinski; Anna Zielinska-Lipiec

doi:10.4028/www.scientific.net/SSP.116-117.136

Paper Titles

Flash Design for Automatic Transfer System of Bearing Hub in Hot Forging Process
p.120

Comparative Evaluation of TiN/CrN, AlN/CrN, TiAlN/CrN Multilayer Films for the Use of Semi-Solid Processing of Cu Alloys
p.124

Effects of Casting Variables on Soundness of A356 Alloy Products in Rheo-Diecasting
p.128

Microstructure Evolution of AZ91D Magnesium Alloy Semi-solid Billets Prepared by a New SIMA Method
p.132

TEM Study of a Creep-Resistant Mg-5Al-2Sr Alloy after Semisolid Molding
p.136

Investigation on Fracture Mechanism of A356 during Thixo-Forging
p.140

Optimal Filling of Test Dies for Evaluating Properties of Semi-Solid Alloys
p.145

Research Progress of Semi-Solid Processing in China
p.149

Influence of Rapid Shear-Rate Changes on Microstructure Formation during Semi-Solid Processing
p.155

HomeSolid State PhenomenaSolid State Phenomena Vols. 116-117TEM Study of a Creep-Resistant Mg-5Al-2Sr Alloy...

TEM Study of a Creep-Resistant Mg-5Al-2Sr Alloy after Semisolid Molding

Abstract:

Transmission electron microscopy (TEM) was used to assess the microstructural changes accompanying semisolid molding of a creep resistant Mg-5%Al-2%Sr alloy. It was revealed that the processing created thixotropic morphologies with globular solids of α-Mg, having well-developed sub-structures. The quickly-solidified liquid fraction, enriched in Al and Sr, led to the formation of increased volumes of a lamellae type Al4Sr phase, surrounding the secondary α-Mg. Traces of Mg17Al12 still existed, predominantly as irregular shape compounds located mainly in grain interiors. Both the primary solid and high melting point precipitates of Mn-Al modified with Sr, acted as nucleation substrates for secondary α-Mg grains.