Study of the Microstructure, Tensile Properties and Hardness of AZ61 Magnesium Alloy Subjected to Severe Plastic Deformation

被引：14
作者：
Hilser, Ondrej [1 ]
Rusz, Stanislav [1 ]
Szkandera, Pavel [1 ]
Cizek, Lubomir [2 ]
Kraus, Martin [2 ]
Dzugan, Jan [3 ]
Maziarz, Wojciech [4 ]
机构：
[1] VSB Tech Univ Ostrava, Dept Mech Technol, Fac Mech Engn, 17 Listopadu 15-2172, Ostrava 70833, Czech Republic
[2] VSB Tech Univ Ostrava, Dept Mat Engn, Fac Met & Mat Engn, 17 Listopadu 15-2172, Ostrava 70833, Czech Republic
[3] COMTES FHT Inc, Prumyslova 995, Dobrany 33441, Czech Republic
[4] Polish Acad Sci, Inst Met & Mat Sci, Reymonta St 25, PL-30059 Krakow, Poland
来源：
METALS | 2018年 / 8卷 / 10期
关键词：
severe plastic deformation; ECAP; twist extrusion; hot extruded AZ61; structure; tensile properties; hardness; HIGH-PRESSURE TORSION; DYNAMIC RECRYSTALLIZATION; GRAIN-REFINEMENT; SPD;
D O I：
10.3390/met8100776
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Hot extruded (EX) AZ61 magnesium alloy was processed by the twist channel angular pressing (TCAP) method, which combines equal channel angular pressing (ECAP) and twist extrusion (TE) processes and significantly improves the efficiency of the grain refinement process. Both the initial hot extruded AZ61 alloy and the alloy after completion of TCAP processing were examined by using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) and their corresponding micro-tensile testing (M-TT) and hardness testing at room temperature. The results showed that the microstructure of hot extruded alloy was refined well by TCAP due to dynamic recrystallization (DRX) caused by TCAP. The tensile properties, investigated by micro-tensile testing (M-TT), of the AZ61 alloy were significantly improved due to refined microstructure. The highest tensile properties including YS of 240.8 MPa, UTS of 343.6 MPa and elongation of 21.4% of the fine-grained alloy with average grain size below 1.5 mu m was obtained after the third TCAP pass at 200 degrees C using the processing route B-c.
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页数：16
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