Enhanced quasi-isotropic ductility in bi-textured AZ91 Mg alloy processed by up-scaled RD-ECAP processing

Sun, Jiapeng; Yang, Zhen; Han, Jing; Yuan, Ting; Song, Dandan; Wu, Yuna; Yuan, Yong; Zhuo, Xiaoru; Liu, Huan; Ma, Aibin

doi:10.1016/j.jallcom.2018.12.008

Cited by 51 publications

(10 citation statements)

References 40 publications

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“…The continuous process of ECAP was invented and developed [21], such as ECAP-Conform [22]; the application of this continuous ECAP process is still challenging for high-shear-strain imposing, and this technique had rare application on Mg alloy. More recently, a rotary-die equal-channel angular pressing (RD-ECAP) method [23,24] was proposed and confirmed to be a high-efficiency process for the application of RE-free Mg alloys [25][26][27][28][29]. As reported in Ref.…”

Section: Introductionmentioning

confidence: 89%

The Effect of Rotary-Die Equal-Channel Angular Pressing Process on the Microstructure, the Mechanical and Friction Properties of GW103 Alloy

et al. 2022

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In this study, the effect of rotary-die equal-channel angular pressing (RD-ECAP) on the microstructure and texture evolution of GW103 alloy is studied. RD-ECAP processes were carried out for 1, 4 and 12 passes at 450 °C. The mechanical properties and friction behavior of RD-ECAP-processed Mg-10Gd-3Y (wt%) alloy (GW103) are discussed. The results reveal that the size of dynamic recrystallized grains and second-phase particles are significantly refined to about 1.3 μm and 1 μm, respectively. The texture evolution of the processed samples is studied by X-ray diffraction and electron backscattered diffraction techniques. The multiple texture components formed are not observed after the conventional ECAP process. Moreover, different dynamic recrystallization (DRX) mechanisms are systemically analyzed and discussed in view of the texture evolution of ECAP processed samples. The final textures obtained after 12 passes are identified as two types: The C-texture type induced by continuous and discontinuous DRX, and the random texture components induced by reorientation of the initial <101¯0> fiber. Based on the grain refinement, precipitate strengthening and texture weakening mechanisms, a high-performance ternary alloy of Mg-Gd-Y was firstly obtained through 12 passes RD-ECAP processing, with a combination of high yield strength of 312 MPa and a high ductility of 22%. In addition, the friction behaviors are also studied. The multi-pass-processed samples exhibit a relatively lower friction coefficient under a load of 10 N at room temperature.

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Section: Introductionmentioning

confidence: 89%

The Effect of Rotary-Die Equal-Channel Angular Pressing Process on the Microstructure, the Mechanical and Friction Properties of GW103 Alloy

et al. 2022

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“…On the one hand, the microstructure is remarkably refined after ECAP, and higher volume fraction of DRX grains results in larger Schmid factor values of deformed alloys, which contributes to the increase in elongation [40]. On the other hand, the uniformity of the microstructure is enhanced gradually and the strain concentration during tensile could be released to some extent, especially at higher ECAP passes [44].…”

Section: Mechanical Properties Of As-cast and Ecap Alloysmentioning

confidence: 99%

A High-Strength and Biodegradable Zn–Mg Alloy with Refined Ternary Eutectic Structure Processed by ECAP

Huang

Liu

Wang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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In this study, the microstructure, mechanical properties and corrosion behaviors of a Zn-1.6Mg (wt%) alloy during multipass rotary die equal channel angle pressing (RD-ECAP) processing at 150 °C were systematically investigated. The results indicated that a Zn + Mg 2 Zn 11 + MgZn 2 ternary eutectic structure was formed in as-cast Zn-Mg alloy. After ECAP, the primary Zn matrix turned to fine dynamic recrystallization (DRX) grains, and the network-shaped eutectic structure was crushed into fine particles and blended with DRX grains. Owing to the refined microstructure, dispersed eutectic structure and dynamically precipitated precipitates, the 8p-ECAP alloy possessed the optimal mechanical properties with ultimate tensile strength of 474 MPa and elongation of 7%. Moreover, the electrochemical results showed that the ECAP alloys exhibited similar corrosion rates with that of as-cast alloys in simulated body fluid, which suggests that a high-strength Zn-Mg alloy was successfully developed without sacrifice of the corrosion resistance.

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“…Prismatic texture (101 0) and conical texture (101 1) and (112 0) are found with weak texture density. Generally, during plastic deformation of magnesium alloys, the slip in the direction of the basal plane is the first thing to occur [16]. Due to the addition of Li, the ratio of c/a crystal axis is decreased, which is favorable to the dislocation slip in the cylindrical and conical directions.…”

Section: Texture Strengtheningmentioning

confidence: 99%

“…ECAP has advantages of producing large bulk materials for various industrial applications, with improvement in strength and ductility properties [13][14][15]. Conventional ECAP process however has typical drawbacks of reinserting billets into the die for every pass, resulting in inconsistencies in temperature applied for each pass [16][17][18]. Some researchers have therefore resorted to the development of novel processes with higher production efficiency, such as repetitive upsetting (RU) [19][20][21] and rotary die equal channel angular pressing (RD-ECAP) [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Development of a High Strength Mg-9Li Alloy via Multi-Pass ECAP and Post-Rolling

Klu

Song

et al. 2019

Metals

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In this study, a high-strength Mg-9Li alloy was developed via multi-pass equal-channel-angular-pressing (ECAP) and post rolling, of which the yield tensile stress (YTS) and ultimate tensile stress (UTS) were 166 MPa and 174 MPa representing about 219% and 70% increase in YTS and UTS respectively, compared to the cast alloy. The cast alloy was ECAP processed at 200 °C for 4, 8, and 16 passes, followed by room-temperature rolling to a total thickness reduction of 50%. The 8-passes ECAPed (E8) alloy presented the best strength of all the ECAPed alloys, and the post rolling endowed the alloy (E8R) further strengthening and the best strength of all the alloys. Grain-boundary strengthening and dislocation strengthening were the two major factors for the high strength of the processed alloys. The α-Mg phase grains were greatly refined to about 2 μm after 8-passes ECAP, and was further refined to about 800 nm ~1.5 μm after rolling. Significant grain refinement endowed the alloy with sufficient grain-boundary strengthening. Profuse intragranular dislocation accumulated in the deformed matrix, leading to the significant dislocation hardening of the alloy. Rolling-induced strong basal texture of the α-Mg phase also enhanced the further strengthening of the E8R alloy.

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Enhanced quasi-isotropic ductility in bi-textured AZ91 Mg alloy processed by up-scaled RD-ECAP processing

Cited by 51 publications

References 40 publications

The Effect of Rotary-Die Equal-Channel Angular Pressing Process on the Microstructure, the Mechanical and Friction Properties of GW103 Alloy

The Effect of Rotary-Die Equal-Channel Angular Pressing Process on the Microstructure, the Mechanical and Friction Properties of GW103 Alloy

A High-Strength and Biodegradable Zn–Mg Alloy with Refined Ternary Eutectic Structure Processed by ECAP

Development of a High Strength Mg-9Li Alloy via Multi-Pass ECAP and Post-Rolling

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