High Mechanical Properties of AZ91 Mg Alloy Processed by Equal Channel Angular Pressing and Rolling

Yuan, Yong; Guo, Qiang; Sun, Jiapeng; Liu, Huan; Xu, Qian; Wu, Yuna; Song, Dandan; Jiang, Jinghua; Ma, Aibin

doi:10.3390/met9040386

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…The tool was prepared from H13 tool steel with a pin size of 4mm diameter, 4mm length, and a flat shoulder with the diameter equal to 18mm. The tool properties are shown in Table 3 [37].…”

Section: Methodsmentioning

confidence: 99%

The Effect of Rapid Deformation Process to Improve Creep and Tensile Resistance of AZ91 Magnesium Alloy Plates

Fashami

Arab

Gollo

et al. 2020

IJE

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Demand for increasing strength to weight ratio, elimination of electromagnetic waves, and vibration damping has led to the wide application of magnesium-base alloys such as AZ91 in various industries like aerospace, military, vehicle, and shipbuilding. However, because of the unstable secondary particles and casting defects located on the rough grain boundaries and in the dendritic regions, due to sliding of the grain boundary, the creep resistance and tensile strength of Mg alloys at high temperatures reduce. To improve the high-temperature properties, rapid deformation processes such as friction stir processing can be employed. In this study, the influence of multi-pass friction stir processing on microhardness, tensile, and creep behavior of AZ91 at several temperatures from 25 to 210 °C has been studied. Optical microscopy and scanning electron micrograph were used to study the microstructure of the cast and processed samples and Clemex commercial software was used for grain size measurement. The experimental results indicated that at room temperature, the microhardness, tensile, and creep strength of the processed samples as compared to the unprocessed ones increased by 23, 29 and 38%, respectively. In addition, after multi-pass friction stir processing, the tensile and creep strength of the samples at 210 °C increased by 31 and 47%, respectively. Also, the average grain size of the multi-passed friction stir processed AZ91 alloy decreased by 88%. The maximum ultimate tensile strength of 276 MPa was obtained at the tool rotational speed of 1200 r/min, the traverse speed of 60 mm/min, and the tool tilt angle of 3°. The empirical results indicated that this rapid deformation process can be useful in enhancing the mechanical properties of AZ91 alloy at high temperatures.

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“…The tool was prepared from H13 tool steel with a pin size of 4mm diameter, 4mm length, and a flat shoulder with the diameter equal to 18mm. The tool properties are shown in Table 3 [37].…”

Section: Methodsmentioning

confidence: 99%

The Effect of Rapid Deformation Process to Improve Creep and Tensile Resistance of AZ91 Magnesium Alloy Plates

Fashami

Arab

Gollo

et al. 2020

IJE

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“…For the samples with the same ARB cycles, the hardness and UTS of ARB LZ91 samples preheated at 400°C are lower than those at 150°C. The pre-heating temperature of 400°C is higher than the recovery and recrystallization temperature of magnesium alloys [9]. The dislocations interaction from plastic deformation could be eliminated by the pre-heating treatment at such temperature, so the hardness and UTS decrease in the cases.…”

Section: Effect Of Pre-heating Temperaturementioning

confidence: 98%

“…The texture of α-Mg and β-Li phases can be elongated along the rolling direction [8]. However, the enhancement of mechanical properties by a traditional rolling process still has the limitations for LZ91 plates applied in a structure material [9].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of mechanical properties for Mg-9Li-1Zn alloy by accumulative roll bonding

Saufan

Wang

2020

Mater. Res. Express

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The microstructures and mechanical properties of LZ91 alloys by accumulative roll bonding (ARB) were firstly investigated. The results show that the cycle numbers of ARB process and preheating temperatures before ARB process have an impact on the microstructures and mechanical properties of LZ91 alloys. The microstructures of LZ91 sheets after ARB perform two main phases of α and β in the fibrous form. ARB process can drive more numbers of crystallographic planes for α and β phases in LZ91 alloys to proof the grain refinement after ARB. More cycle numbers of ARB on LZ91 sheets makes the fibrous microstructures finer and increases the mechanical properties such as hardness and ultimate tensile strength due to the mechanism of strain hardening and grain refinement.

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“…Thereby, the fine and dispersed precipitates prevent growth of new recrystallized grains via the pinning effect mechanism [34]. By reducing temperature of the second pass to 200 • C (S4 sample), recrystallization is replaced by twinning, which occurs in the un-recrystallized grains remaining from the first pass of processing at 340 • C [35]. In this condition, the dislocation density increases by one order of magnitude, as compared to the S3 sample.…”

Section: Sample Mean Grain Size (µM)mentioning

confidence: 99%

Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing

2022

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In the current study, Twin Parallel Channel Angular Extrusion (TPCAE) as a developed SPD processing technique is used to improve the hydrogen storage properties of AZ91 cast alloy. The processing is conducted at different temperatures, ranging from 340 °C down to 200 °C. The hydrogen absorption and desorption tests are conducted kinetically at three different temperatures, using a Sievert-type apparatus. Remarkable improvement in the absorption kinetic is achieved as a result of the TPCAE processing. A maximum absorption capacity of 6.1 wt.% within a time span of 2000 s is achieved for the sample with three passes of processing complemented at 250 °C. Also, the kinetic of dehydrogenation is improved significantly and complete desorption at 350 °C is achieved for all the processed samples within a time span of maximum 2500 s. By calculating the activation energy of hydrogenation and evaluating the microstructure changes, it is found that implementing sufficient thermomechanical work level along with applying the last pass of the process at lower temperature results in a reduction of the activation energy and improvement of the hydrogenation kinetic.

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High Mechanical Properties of AZ91 Mg Alloy Processed by Equal Channel Angular Pressing and Rolling

Cited by 10 publications

References 22 publications

The Effect of Rapid Deformation Process to Improve Creep and Tensile Resistance of AZ91 Magnesium Alloy Plates

The Effect of Rapid Deformation Process to Improve Creep and Tensile Resistance of AZ91 Magnesium Alloy Plates

Enhancement of mechanical properties for Mg-9Li-1Zn alloy by accumulative roll bonding

Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing

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