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Thermal stability and microstructure development of cast and powder metallurgy produced Mg-Y-Zn alloy during heat treatment

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Journal of Magnesium and Alloys 2017年第2期5卷 173-180页

作者： Tomas Kekule bohumil smola Martin Vlach Hana Kudrnova Veronika Kodetova Ivana Stulikova Charles University in Prague Faculty of Mathematics and PhysicsKe Karlovu 3Praha 212116Czech Republic

Response to isochronal annealing up to 440 ℃ of squeeze cast Mg–Y–Zn alloy and of the same alloy prepared by powder metallurgy(PM)and extruded at 280 ℃ was studied by resistivity and microhardness measurement,differential scanning calorimetry(DSC)and microstructure *** resistivity was measured at 77 K and microhardness was measured at room temperature after each annealing *** measurement was performed at various heating *** and scanning electron microscopy and optical microscopy revealed ribbons of long-period ordered structure(LPSO)18R and planar defects within grain *** high density of planar defects was found in grain interiors of the cast alloy with the grain size approximately 50μ*** pronounced subgrains were observed in the PM prepared *** phase particles decorate grain boundaries in this *** precipitation processes were detected in the cast alloy during repeated isochronal annealing up to 440 ℃,whereas only one significant process was revealed in the PM *** processes were identified as embedding of stacking faults by solutes,development and rearrangement(18R→14H)of LPSO phase and development of grain boundary particles.A coarsening of grain boundary particles rich in Y and Zn only proceeds in the PM *** energies of the precipitation processes were *** exhibits good thermal stability against annealing up to 360 ℃ in the PM alloy.

关键词： Mg-Y-Zn alloys Powder metallurgy Microhardness Microstructure development Electrical resistivity

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