Thermal stability and microstructure development of cast and powder metallurgy produced Mg-Y-Zn alloy during heat treatment
作者机构：Charles University in PragueFaculty of Mathematics and PhysicsKe Karlovu 3Praha 212116Czech Republic
出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)
年 卷 期：2017年第5卷第2期
页 面：173-180页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：the Czech Science Foundation(GACR) project No.16-12828S is also gratefully acknowledged
主 题：Mg-Y-Zn alloys Powder metallurgy Microhardness Microstructure development Electrical resistivity
摘 要：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.
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