The Effect of ECAP Temperature on the Microstructure and Properties of a Rolled Rare Earth Magnesium Alloy

Tan, Yi; Li, Wei; Hu, Weiwei; Shi, Xiaofang; Tian, Liang

doi:10.3390/ma12091554

Cited by 17 publications

(6 citation statements)

References 27 publications

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“…Huang et al [76] observed similar fracture mechanisms in a Mg-Al-Ca-Mn alloy exhibiting improved ductility after multi pass ECAP. Akin to the present study, a Mg-2Y-0.6Nd-0.6Zr alloy also exhibited a transition from brittle to ductile fracture with increased dimples and a tearing ridge on ECAP at higher temperatures [77].…”

Section: Fractographysupporting

confidence: 76%

WITHDRAWN: Effect of equal channel angular pressing route and temperature on the mechanical behavior of ZE41 Mg alloy

Chiranth¹,

Siddaraju²,

Sevvel³

et al. 2021

Preprint

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A commercial ZE41 Mg alloy was processed by equal channel angular pressing (ECAP) using route BC (90o sample rotation after each pass) and route C (180o sample rotation after each pass) at 250, 300 and 350 oC for up to 4 passes. Significant grain refinement from ∼150 μm to ∼33 μm occurred at the higher third and fourth ECAP passes. The most effective process among all routes and temperature combinations was via route C at 250 oC. Nearly 83% increase in yield strength, 58% increase in ultimate tensile strength, and 107% increase in fracture strain were observed after 4 ECAP passes using route C at 250 oC. The increase in the strength of the alloy was attributed to grain refinement during static and dynamic recrystallization. Fractography of tensile samples showed that shallow dimples change to fine dimples at higher passes modifying the failure mode from cleavage to ductile fracture.

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Section: Fractographysupporting

confidence: 76%

WITHDRAWN: Effect of equal channel angular pressing route and temperature on the mechanical behavior of ZE41 Mg alloy

Chiranth¹,

Siddaraju²,

Sevvel³

et al. 2021

Preprint

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“…The average Schmid factors of the EK30–2.0Ag alloy are slightly higher than those for the EK30 alloy. A higher Schmid factor means that the basal slip is more likely to activate, resulting in a higher elongation of the alloy [ 30 , 31 ].…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of EK30 Alloy Synergistically Reinforced by Ag Alloying and Hot Extrusion for Aerospace Applications

et al. 2022

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Enhancing the mechanical properties of magnesium alloys to meet the urgent need for their lightweight applications in the aerospace field has always been a great challenge. Herein, the effect of Ag on the microstructure and tensile properties of the Mg−2.5Nd−1.0Sm−0.4Zn−0.1Ca−0.5Zr (EK30) alloy prepared by integrated extrusion and equal-channel angular pressing is studied. The microstructure of as-extruded alloys consists of α-Mg grains and the β phase. The addition of Ag increases the β-phase content. The β phase can promote dynamic recrystallization by inducing a particle-stimulated nucleation mechanism and inhibiting grain growth, which leads to grain refinement and texture weakening. At 250 °C, the ultimate tensile strength of the EK30–2.0Ag alloy (225.9 MPa) increased by 13.8% compared to the Ag-free alloy (198.4 MPa). When the tensile temperature increased from 25 °C to 250 °C, the ultimate tensile strength of the EK30–2.0Ag alloy decreased by 14.3%, from 263.7 MPa to 225.9 MPa. Notably, the addition of Ag slightly reduced the elongation of the alloy at 250 °C; the elongations of the EK30–2.0Ag alloy and the EK30 alloy are 41.5% and 37.0%, respectively. The elongation of the EK30–2.0Ag alloy increased from 22.7% at 25 °C to 52.7% at 275 °C. All alloy tensile fractures exhibited typical plastic fracture characteristics. This study provides an effective way to enhance the high-temperature mechanical properties of magnesium alloys by Ag alloying and a special severe plastic deformation method.

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“…Additionally, hightemperature processing leads to precipitation strengthening besides grain refinement and this formation of precipitates may cause inhomogeneous microstructure and grain refinement. Study shows that ECAP processing at high temperatures encourages dynamic recrystallisation resulting in a mixture of elongated and fine grain sizes, and therefore causing non-uniformity in the microstructure [22]. The results on loading and damage on the structure of the specimen, are as shown in Figs.…”

Section: Effect Of Die Temperature On the Processingmentioning

confidence: 86%

Simulation of deformation behaviour of Aluminium 7075 during Equal Channel Angular Pressing (ECAP)

Shagwira

Obiko²,

Mwema³

et al. 2023

MATEC Web Conf.

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This paper presents a finite element simulation of equal channel angular pressing (ECAP) since it is one of the most common and successful severe plastic deformation techniques. This study reports the influence of the most significant factors influencing the ECAP technique. Through finite element simulation, the effect of the die geometry, workpiece geometry, and the pressing speed on the effective strain distributions, damage, and pressing loads, were investigated. The influence of the ECAP method on different material models is also presented. Additionally, the prospective expansion and future applications of ECAP are herein highlighted. From the results, the die geometry of a 90° channel imparts the highest strains during ECAP. Additionally, specimens of rectangular geometry are susceptible to cracking and damage as compared to circular samples. It was found that very high processing speeds (>7mm/sec) are undesirable during ECAP since they cause very high internal stresses to the structure of the workpieces. Besides, processing at room temperature can achieve homogeneous strain distribution with minimum sample damage.

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The Effect of ECAP Temperature on the Microstructure and Properties of a Rolled Rare Earth Magnesium Alloy

Cited by 17 publications

References 27 publications

WITHDRAWN: Effect of equal channel angular pressing route and temperature on the mechanical behavior of ZE41 Mg alloy

WITHDRAWN: Effect of equal channel angular pressing route and temperature on the mechanical behavior of ZE41 Mg alloy

Microstructure and Mechanical Properties of EK30 Alloy Synergistically Reinforced by Ag Alloying and Hot Extrusion for Aerospace Applications

Simulation of deformation behaviour of Aluminium 7075 during Equal Channel Angular Pressing (ECAP)

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