Microhardness, microstructure and tensile behavior of an AZ31 magnesium alloy processed by high-pressure torsion

Xu, Jie; Wang, Xinwei; Shirooyeh, Mahmood; Xing, Guangnan; Shan, Debin; Guo, Bin; Langdon, Terence G.

doi:10.1007/s10853-015-9300-x

Cited by 62 publications

(31 citation statements)

References 81 publications

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“…There is a gradual evolution toward higher microhardness values with increasing numbers of turns after HPT processing. There is a reasonable level of hardness homogeneity which is achieved across the HPT disks through ten turns with a saturation hardness value of Hv ≈ 125 as shown in Figure 2 [6]. This gradual development of hardness homogeneity is consistent with several experimental reports for magnesium alloys processed by HPT [7][8][9][10].…”

Section: Multifunctional Properties Of Ultrafine-grained Materials 2supporting

confidence: 88%

“…By comparison with the sample processed by ECAP, Figure 2 shows the evolution in microhardness over one-quarter of the disk for the same AZ31 alloy processed by HPT through (a) 1/4, (b) 1, (c) 5, and (d) 10 turns [6]. There is a gradual evolution toward higher microhardness values with increasing numbers of turns after HPT processing.…”

Section: Multifunctional Properties Of Ultrafine-grained Materials 2mentioning

confidence: 99%

“…For example, an investigation of the superplastic micro-forming of the magnesium AZ91 alloy with a UFG microstructure showed that the grain size and the transition from superplastic flow to non-superplastic flow were the main parameters controlling the micro-formability [82]. A UFG AZ31 magnesium alloy with average grain size of ~110 nm processed by HPT for 10 turns under an imposed pressure of 6.0 GPa shows a highest elongation of ~400% testing at a temperature of 423 K and a strain rate of 1.0 × 10 −4 s −1 [6]. This elongation of the sample processed by HPT is more than two times larger than the elongation of ~192% recorded in the same alloy processed by ECAP through eight passes testing at 472 K [5].…”

Section: Potential Application In Micro-forming Technologymentioning

confidence: 99%

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Innovative Applications of Ultrafine-Grained Materials

Xu¹,

Guo²,

Shan³

2017

Severe Plastic Deformation Techniques

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This chapter focuses on multifunctional properties of ultrafine-grained (UFG) metallic materials processed by severe plastic deformation (SPD), such as enhanced mechanical properties, excellent superplasticity, and wear resistance. Based on these multifunctional properties, the potential innovative application for UFG materials processed by SPD is introduced in the next section, including innovative application in micro-forming, nanoimplants, electro-connections, and sport engineering.

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Section: Multifunctional Properties Of Ultrafine-grained Materials 2supporting

confidence: 88%

Section: Multifunctional Properties Of Ultrafine-grained Materials 2mentioning

confidence: 99%

Section: Potential Application In Micro-forming Technologymentioning

confidence: 99%

See 1 more Smart Citation

Innovative Applications of Ultrafine-Grained Materials

Xu¹,

Guo²,

Shan³

2017

Severe Plastic Deformation Techniques

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“…Many papers have reported the formation of ultrafine grained structures in pure magnesium [3][4][5][6] and AZ31 [7][8][9][10][11] , AZ61 12 , AZ80 13 , AZ91 [14][15][16] , ZK60 [17][18][19] , Mg-Zn-Y 20,21 , Mg-Gd-Y-Zr 22,23 , Mg-Zn-Ca [24][25][26][27] and Mg-Dy-Al-Zn-Zr 28 alloys. The processed alloys exhibit improved strength but also some papers report superplastic behaviour 16,19,22,29,30 , improved hydrogen storage properties 3,[31][32][33][34][35] and improved corrosion resistance 24,27,36 .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Hardness Evolution in Magnesium Processed by HPT

et al. 2017

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High pressure torsion provides an opportunity to process materials with low formability such as magnesium at room temperature. The present work shows the microstructure evolution in commercially pure magnesium processed using a pressure of 6.0 GPa up to 10 turns of rotation. The microstructure evolution is evaluated using electron microscopy and the hardness is determined using dynamic hardness testing. The results show that the grain refinement mechanism in this material differs from materials with b.c.c. and f.c.c. structures. The mechanism of grain refinement observed at high temperatures also applies at room temperature. The hardness distribution is heterogeneous along the longitudinal section of the discs and is not affected by the amount of deformation imposed to the material.

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“…It may be resulted from the table 1 that the elongation to failure depends on grain size as well established that the superplastic flow mechanism is based on the movement of dislocations along the grain boundaries with some limited intragranular slip acting as an accommodation process [3]. AZ31 alloy with 110 nm grain size processed by HPT showed an elongation of about 310% [23] while the same alloy with 1 μm grain size processed by ECAP showed 200% elongation [6]. Also, comparison of the data showed that the temperature of tensile testing has a remarkable effect on elongation.…”

Section: Resultsmentioning

confidence: 99%

Hot deformation behavior of Mg-Zn-Al alloy tube processed by severe plastic deformation

Fata¹,

Faraji²,

Mashhadi³

et al. 2017

Archives of Metallurgy and Materials

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In the current study, severe plastic deformation (SPD) was applied on a commercial Mg-3Al-1Zn alloy tubes via parallel tubular channel angular pressing (PTCAP) route. Different passes of PTCAP process were applied, and microstructure, hardness and tensile properties at the room, and elevated temperatures were evaluated. The results showed that bimodal microstructure appeared and led to AZ31 alloy represented higher hardness, higher strength with a reasonable elongation at room temperature. Similarly, very high elongation to failure was achieved at a higher temperature. The increase in the number of SPD passes up to two, leads to increasing the ductility up to 263% at 400°C. Then, an increase in the number of PTCAP passes to three, leads to decrease in the ductility as the results of formation of microvoids when SPD processing at higher equivalent strains without a sufficient hydrostatic compressive stress. Relatively ductile fracture mode was also occurred in all samples.

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Microhardness, microstructure and tensile behavior of an AZ31 magnesium alloy processed by high-pressure torsion

Cited by 62 publications

References 81 publications

Innovative Applications of Ultrafine-Grained Materials

Innovative Applications of Ultrafine-Grained Materials

Microstructure and Hardness Evolution in Magnesium Processed by HPT

Hot deformation behavior of Mg-Zn-Al alloy tube processed by severe plastic deformation

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