Enhanced mechanical properties of as-cast AZ91 magnesium alloy by combined RE-Sr addition and hot extrusion

被引：68
作者：
Afsharnaderi, Aria [1 ]
Lotfpour, Mehrab [1 ]
Mirzadeh, Hamed [1 ]
Emamy, Massoud [1 ]
Malekan, Mehdi [1 ]
机构：
[1] Univ Tehran, Coll Engn, Sch Met & Mat Engn, POB 11155-4563, Tehran, Iran
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 792卷
关键词：
Mg alloys; Mischmetal addition; Mechanical properties; Grain refinement; Hot deformation; CREEP-BEHAVIOR; INTERMETALLIC COMPOUNDS; CONSTITUTIVE ANALYSIS; TENSILE PROPERTIES; MICROSTRUCTURE; MG; GD; REFINEMENT; CORROSION; DUCTILITY;
D O I：
10.1016/j.msea.2020.139817
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The synergetic effects of strontium (Sr) and rare earth elements (RE) on the modification of the microstructure and enhancement of the mechanical properties of as-cast Mg-9Al-1Zn alloy were studied. Based on the microstructural analysis, phase identification, and tensile tests, it was revealed that the combined RE and Sr addition results in superior mechanical properties compared to those of solo additions of RE or Sr. This was related to both morphological enhancement of the beta-Mg17Al12 intermetallics notably by RE towards the disappearance of the intergranular network and modification of the Al(11)RE(3 )particles by Sr. The enhancement of tensile properties was achieved by increasing the RE/Sr ratio in the Sr-RE containing alloys and the best combination of mechanical properties was observed for the Mg-9Al-1Zn-0.9RE-0.1Sr alloy. Owing to the dissolution of the p phase and solid solution strengthening effect of Al, the tensile properties of the Mg-9Al-1Zn-0.9RE-0.1Sr alloy were enhanced by homogenization treatment. Moreover, the hot extrusion process remarkably augmented the tensile properties by combined effects of grain refinement and fracturing and distributing the intermetallic particles.
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页数：8
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