Microstructures and mechanical properties of AZ61 magnesium alloy after isothermal multidirectional forging with increasing strain rate

Li, Juqiang; Liu, Juan; Cui, Zhenshan

doi:10.1016/j.msea.2015.07.028

Cited by 48 publications

(15 citation statements)

References 25 publications

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“…This procedure has been widely used, for example, to improve the properties of aluminum [18,19] and titanium [20] alloys. In addition, the effectiveness of using this processing method for grain refinement in magnesium alloys down to the UFG state was demonstrated in [12,21,22,23,24,25,26,27,28,29,30]. Thus, Li et al [26] showed that the application of MAD to alloy Mg-2%Zn-2%Gd allows attaining a very fine microstructure with the average grain size of ~500 nm.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties, Biodegradation, and Biocompatibility of Ultrafine Grained Magnesium Alloy WE43

et al. 2019

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In this work, the effect of an ultrafine-grained (UFG) structure obtained by multiaxial deformation (MAD) on the mechanical properties, fatigue strength, biodegradation, and biocompatibility in vivo of the magnesium alloy WE43 was studied. The grain refinement down to 0.93 ± 0.29 µm and the formation of Mg41Nd5 phase particles with an average size of 0.34 ± 0.21 µm were shown to raise the ultimate tensile strength to 300 MPa. Besides, MAD improved the ductility of the alloy, boosting the total elongation from 9% to 17.2%. An additional positive effect of MAD was an increase in the fatigue strength of the alloy from 90 to 165 MPa. The formation of the UFG structure also reduced the biodegradation rate of the alloy under both in vitro and in vivo conditions. The relative mass loss after six weeks of experiment was 83% and 19% in vitro and 46% and 7% in vivo for the initial and the deformed alloy, respectively. Accumulation of hydrogen and the formation of necrotic masses were observed after implantation of alloy specimens in both conditions. Despite these detrimental phenomena, the desired replacement of the implant and the surrounding cavity with new connective tissue was observed in the areas of implantation.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties, Biodegradation, and Biocompatibility of Ultrafine Grained Magnesium Alloy WE43

et al. 2019

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“…[7][8][9] In recent years, SPD techniques are widely applied in producing the UFG structures in bulk metallic alloys. [10][11][12][13][14] Equal channel angular pressing (ECAP), 15,16 high pressure torsion (HPT), equal channel angular rolling (ECAR), [18][19][20] constrained groove pressing, [21][22][23][24][25] non-equal channel angular pressing 26 and cyclic close die forging (CCDF) 27 are some of the SPD processes which have been recently investigated.…”

Section: Introductionmentioning

confidence: 99%

“…CCDF produces more intensive strains per pass in comparison with other SPD processes and also more uniform microstructure of the material may be achieved because it involves multi-directional deformation. 27 The equivalent strain per operation is given by equation (1) ( n is the number of passes) …”

Section: Introductionmentioning

confidence: 99%

The effects of combined cyclic close die forging and aging process on microstructure and mechanical properties of AA7075

Moazam

Honarpisheh

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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It is well known that applying severe plastic deformation methods on the precipitation hardenable aluminum alloys at room temperature is very difficult because of crack formation and segmentation of the specimen during the processes. In this study, several procedures were experimentally examined for performing the cyclic close die forging (CCDF) and improving the mechanical properties of AA7075. The experimental tests revealed that supersaturated solid solution of AA7075 after water quenching is formable for only about 5 min and performing the CCDF process in this limited time is possible. Optical and scanning electron microscopy and transmission electron microscopy were used to study the microstructure of the processed samples. It was observed that by applying two passes of CCDF, the grain size of the material reduced from 30 µm to about 200–300 nm. In addition, the X-ray diffractometer results demonstrated that Guinier–Preston zone picks of the processed samples are very weak and the equilibrium η-phase does not exist in none of the suggested procedures. Furthermore, it was found that by combining CCDF and aging processes according to the proposed procedures, the mechanical properties of the processed AA7075 were improved when compared with the AA7075-T6. To put it more clearly, micro-hardness, yield strength and ultimate tensile stress of the processed sample were improved as much as 38.6%, 25% and 23%, respectively.

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“…The IMF parameters, such as strain per pass, temperature, and strain rate, should be optimized to achieve a uniform UFG structure. Many researchers have studied the IMF effect on the properties of aluminum- and magnesium-based alloys, and their microstructure after IMF [33,37,39,40,41,42,43]. Multiaxial compression can withstand large strains ∑ e > 28 [44,45,46].…”

Section: Introductionmentioning

confidence: 99%

Effect of Multidirectional Forging on the Grain Structure and Mechanical Properties of the Al–Mg–Mn Alloy

et al. 2018

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The effect of isothermal multidirectional forging (IMF) on the microstructure evolution of a conventional Al–Mg-based alloy was studied in the strain range of 1.5 to 6.0, and in the temperature range of 200 to 500 °C. A mean grain size in the near-surface layer decreased with increasing cumulative strain after IMF at 400 °C and 500 °C; the grain structure was inhomogeneous, and consisted of coarse and fine recrystallized grains. There was no evidence of recrystallization when the micro-shear bands were observed after IMF at 200 and 300 °C. Thermomechanical treatment, including IMF followed by 50% cold rolling and annealing at 450 °C for 30 min, produced a homogeneous equiaxed grain structure with a mean grain size of 5 µm. As a result, the fine-grained sheets exhibited a yield strength and an elongation to failure 30% higher than that of the sheets processed with simple thermomechanical treatment. The IMF technique can be successfully used to produce fine-grained materials with improved mechanical properties.

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Microstructures and mechanical properties of AZ61 magnesium alloy after isothermal multidirectional forging with increasing strain rate

Cited by 48 publications

References 25 publications

Mechanical Properties, Biodegradation, and Biocompatibility of Ultrafine Grained Magnesium Alloy WE43

Mechanical Properties, Biodegradation, and Biocompatibility of Ultrafine Grained Magnesium Alloy WE43

The effects of combined cyclic close die forging and aging process on microstructure and mechanical properties of AA7075

Effect of Multidirectional Forging on the Grain Structure and Mechanical Properties of the Al–Mg–Mn Alloy

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