Microstructure Evolution and Mechanical Properties of an AZ61 Mg Alloy through Cyclic Extrusion Compression

2007 ◽  
pp. 253-256
Author(s):  
Lu Jun Zhang ◽  
Qu Dong Wang ◽  
Yong Jun Chen ◽  
Jin Bao Lin
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Mg Alloy ◽  
Cyclic Extrusion Compression ◽  
Az61 Mg Alloy

Microstructure Evolution and Mechanical Properties of an AZ61 Mg Alloy through Cyclic Extrusion Compression

2007 ◽  
Vol 546-549 ◽  
pp. 253-256 ◽  
Author(s):  
Lu Jun Zhang ◽  
Qu Dong Wang ◽  
Yong Jun Chen ◽  
Jin Bao Lin
Keyword(s):  
Mechanical Properties ◽  
Grain Boundaries ◽  
Microstructure Evolution ◽  
Dynamic Recovery ◽  
Mg Alloy ◽  
High Angle ◽  
Initial Stage ◽  
Cyclic Extrusion Compression ◽  
Continuous Dynamic ◽  
Az61 Mg Alloy

Microstructure evolution and mechanical properties of an AZ61 Mg alloy processed by cyclic extrusion compression were investigated. It is shown that CEC process may be applied successfully to AZ61 Mg alloys, and this leads to excellent grain refinement with grain size of ~0.8μm after 15 passes at 573K and to significant improvements in yield strength, ductility and hardness of AZ61 materials with slight compressive strength decreases. Dislocations were induced at initial stage of CEC process, and with increased deformation, tangled dislocations developed to form dislocation boundaries and subgrain boundaries, and then evolved into low angle grain boundaries (LAGBs) and high angle grain boundaries (HAGBs) which was regarded as continuous dynamic recovery and recrystallization (CDRR).

Investigations on Microstructure Evolution and Deformation Behavior of Aged and Ultrafine Grained Al-Zn-Mg Alloy Subjected to Severe Plastic Deformation

2010 ◽  
Vol 667-669 ◽  
pp. 253-258
Author(s):  
Wei Ping Hu ◽  
Si Yuan Zhang ◽  
Xiao Yu He ◽  
Zhen Yang Liu ◽  
Rolf Berghammer ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Plastic Deformation ◽  
Grain Size ◽  
Severe Plastic Deformation ◽  
Microstructure Evolution ◽  
Deformation Behavior ◽  
Deformation Mechanisms ◽  
Mg Alloy ◽  
Ultrafine Grained

An aged Al-5Zn-1.6Mg alloy with fine η' precipitates was grain refined to ~100 nm grain size by severe plastic deformation (SPD). Microstructure evolution during SPD and mechanical behaviour after SPD of the alloy were characterized by electron microscopy and tensile, compression as well as nanoindentation tests. The influence of η' precipitates on microstructure and mechanical properties of ultrafine grained Al-Zn-Mg alloy is discussed with respect to their effect on dislocation configurations and deformation mechanisms during processing of the alloy.

scholarly journals Microstructure Evolution and Mechanical Properties of AZ80 Mg Alloy during Annular Channel Angular Extrusion Process and Heat Treatment

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4223 ◽  
Author(s):  
Xi Zhao ◽  
Shuchang Li ◽  
Fafa Yan ◽  
Zhimin Zhang ◽  
Yaojin Wu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Microstructure Evolution ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Annular Channel ◽  
Mg Alloy ◽  
Strengthening Effect ◽  
Β Phase ◽  
Angular Extrusion

Microstructure evolution and mechanical properties of AZ80 Mg alloy during annular channel angular extrusion (350 °C) and heat treatment with varying parameters were investigated, respectively. The results showed that dynamic recrystallization of Mg grains was developed and the dendritic eutectic β-Mg17Al12 phases formed during the solidification were broken into small β-phase particles after hot extrusion. Moreover, a weak texture with two dominant peaks formed owing to the significant grain refinement and the enhanced activation of pyramidal <c + a> slip at relative high temperature. The tension tests showed that both the yield strength and ultimate tensile strength of the extruded alloy were dramatically improved owing to the joint strengthening effect of fine grain and β-phase particles as compared with the homogenized sample. The solution treatment achieved the good plasticity of the alloy resulting from the dissolution of β-phases and the development of more equiaxed grains, while the direct-aging process led to poor alloy elongation as a result of residual eutectic β-phases. After solution and aging treatment, simultaneous bonding strength and plasticity of the alloy were achieved, as a consequence of dissolution of coarse eutectic β-phases and heterogeneous precipitation of a large quantity of newly formed β-phases with both the morphologies of continuous and discontinuous precipitates.

Microstructure Evolution and Mechanical Properties of Mg-2.5Zn-0.5Y Alloy

2013 ◽  
Vol 380-384 ◽  
pp. 4372-4375
Author(s):  
Li Zhang ◽  
Zheng Liu ◽  
Ping Li Mao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Microstructure Evolution ◽  
Hot Extrusion ◽  
Intermetallic Phases ◽  
Mg Alloy ◽  
Refined Microstructure

The microstructure evolution and mechanical properties of as-extruded Mg-2.5 Zn-0.5Y Mg alloy were investigated. The grainy intermetallic phases (I-phase and w-phase) observed in the as-cast Mg-2.5Zn-0.5Y alloy distributed homogeneously in the hot extruded alloys. Compared with the cast one, the extruded alloy shows predominant mechanical properties as the result of refined microstructure and the dispersed intermetallic phases formed during hot extrusion. The ultimate tensile strength and the yield tensile strength of the extruded alloy were 354.8 MPa and 305.9MPa respectively.

Microstructures and Mechanical Properties of Mg Alloy after Severe Torsion Straining Process

2006 ◽  
Vol 503-504 ◽  
pp. 949-954 ◽  
Author(s):  
Yuichi Miyahara ◽  
N. Emi ◽  
Koji Neishi ◽  
Katsuaki Nakamura ◽  
Kenji Kaneko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Grain Refinement ◽  
Room Temperature ◽  
Rotation Speed ◽  
Continuous Process ◽  
Mg Alloy ◽  
Compression Tests ◽  
Moving Speed ◽  
Az61 Mg Alloy

Grain refinement is attempted using severe plastic deformation (SPD) through the severe torsion straining process (STSP) which we have developed recently. The STSP is a continuous process for grain refinement without requirement of any die. In this study, an AZ61 Mg alloy was subjected to STSP at a temperature of 573 K with a rotation speed of 10 rpm and a moving speed of 200 mm/min. With this process, an initial grain size of ~20 μm was reduced to ~2~3 μm. Room temperature compression tests revealed that there were no cracks after 15% of compression for the STSP sample whereas fracture occurred for a conventionally extruded sample. For compression tests at 473 K, no cracks occurred in the STSP samples after 80% compression but compression was feasible without cracking only up to 20% for an extruded sample. It is shown that the STSP can be useful for grain refinement and ductility improvement of the AZ61 Mg alloy.

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