Effect of ECAP Die Angles on Microstructure Mechanical Properties and Corrosion Behavior of AZ80 Mg Alloy

Naik, Gajanan M.; Narendranath, S.; Kumar, Sanjeev

doi:10.1007/s11665-019-04080-5

Cited by 40 publications

(17 citation statements)

References 39 publications

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“…From accessible literature there is no much focus on the technique to improve the bio-mechanical integrity of Mg alloys. Our previous studies improved the mechanical properties and corrosion behaviour of Mg alloys by ECAP [22][23][24][25][26][27]. The objective of the current study is to improve the biomechanical properties of ZM21 Mg alloy by ECAP for orthopaedic implant application.…”

Section: Introductionmentioning

confidence: 94%

Bio-corrosion impacts on mechanical integrity of ZM21 Mg for orthopaedic implant application processed by equal channel angular pressing

Sekar

Nyahale

Naik

et al. 2021

J Mater Sci: Mater Med

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The mechanical integrity of rolled ZM21 Mg was improved by equal channel angular pressing (ECAP) to function as a potential biodegradable bone screw implant. Electron backscattered diffraction (EBSD) revealed deformed grains of 45 µm observed in rolled ZM21 Mg. They were transformed to equiaxed fine grains of 5.4 µm after 4th pass ECAP. The yield strength of rolled and ECAPed ZM21 Mg alloys were comparable. In contrast, 4th pass ZM21 Mg exhibited relatively higher elongation when compared to rolled sample. The mechanical properties of rolled and ECAPed ZM21 Mg were dependant on both grain refinement and crystallographic texture. The rolled and 4th pass ECAPed tensile samples exhibited nonlinear deterioration of mechanical properties when tested after 7, 14, 21 and 28 days immersion in Hank’s solution. The evaluation signifies that regardless their processing condition, ZM21 Mg alloys are suitable for surgical areas that requires high mechanical strength. In addition, the 4th pass ECAP samples were viable to MG-63 cells proving themselves to be promising candidates for future in vivo studies.

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Section: Introductionmentioning

confidence: 94%

Bio-corrosion impacts on mechanical integrity of ZM21 Mg for orthopaedic implant application processed by equal channel angular pressing

Sekar

Nyahale

Naik

et al. 2021

J Mater Sci: Mater Med

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“…This process is repeated by using route R, where the samples were inverted from its initial position between two successive passes as shown in Figure 5(a). The processed samples after ECAP operation is shown in Figure 5(b) [7][8][9][10][11][12].…”

Section: Equal Channel Angular Extrusionmentioning

confidence: 99%

“…Specimens for microstructure inspection were prepared by mechanical polishing with silicon carbide abrasive papers (grades of 400, 800, 1000, 1200, 1500, 2000) followed by cloth polishing using diamond paste and kerosene for obtaining mirror finish surface and finally cleaned with acetone. Further, Etching was carried on the polished surface for approximately 3 to 5 s, in a solution of 4.2 g picric acid, 10 ml acetic acid, 10 ml distilled water and 70 ml ethanol for 3-5 s [8][9][10][11][12]. So that sample turns light brown and washed with running distilled water and dried.…”

Section: Optical Microscopementioning

confidence: 99%

Effect of ECAE Die Angle on Microstructure Mechanical Properties and Corrosion Behavior of AZ80/91 Magnesium Alloys

Naik¹,

Bandadka²,

Manjaiah³

et al. 2022

Magnesium Alloys Structure and Properties

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Magnesium alloys have poor tensile strength, ductility and corrosion resistance properties associated with other engineering materials like aluminum alloys, steels and superalloys etc. Therefore, many researchers worked on equal channel angular pressing of magnesium alloys to improve the mechanical properties and corrosion resistance. In this work, the effect of channel angles on material properties was investigated during equal channel angular pressing of AZ80/91 magnesium alloy using processing route-R at 598 K processing temperature. Channel angles of 900 and 1100, common corner angle of 300 have been considered for the study. It has been revealed that the channel angle has a significant influence on deformation homogeneity, microhardness, ultimate tensile strength, ductility, and corrosion behavior of AZ80/91 magnesium alloys. Specifically, AZ80/91 Mg alloys processed through 900 channel angle i.e. die A is considered as optimal die parameter to improve above-said material properties. Investigation showing concerning as-received AZ80 and AZ91 Mg alloy indicates 11%, 14% improvement of UTS and 69%, 59% enhancement in ductility after processing through 4P through die A (90°) at 598 K respectively. Also, the corrosion rate reduces to 97% and 99% after processing the sample with 4P-ECAP die A (90°) at the same processing temperature for AZ80 and AZ91 Mg alloys respectively. This is mainly due to grain refinement and distribution of Mg17Al12 secondary phase during ECAP.

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“…Equal channel angular press is the most promising method to apply severe plastic deformation (SPD), producing ultra-fine grain in the bulk material without residual porosity [6]. The large bulk sizes of ECAP processing materials become an advantage to obtain nano and ultra-fine structured mechanical parts and offer the opportunity to scale up the process to an industrial level [7]. The ECAP process utilized a sample that pressed through a die with two intersecting channels equal in the cross-section.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ecap Processing to Hardness, Surface Morphologi, and Corrosion Resistance of 6061 Aluminium Alloys

Puspasari

Mabruri²,

Herbirowo³

et al. 2021

metal.

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Al-Mg-Si alloys (6xxx) has been widely used as structural materials in building and vehicles because of its excellent strength and corrosion resistance. The improvement of fine grain microstructure which can increase mechanical and physical properties become an interesting field in recent research.. Equal channel angular press is the most promising method to apply severe plastic deformation (SPD) which can produce ultra-fine grain in the bulk material without residual porosity. This study presents some experiments results on the effect of ECAP number of passes variation to the hardness, microstructure, and corrosion behaviour of Al 6061 alloys. The samples were annealed in the furnace with argon gas environment at 530°C for 4 hours and then immersed in liquid nitrogen for 5 minutes before ECAP process. The ECAP process was done with Bc route using dies with 120° of internal channel angle and pass variation of 1, 2, 3, and 4. The optimum hardness is 107.58 HRB in Al 6061 samples with 3 passes of ECAP. The increasing ECAP number of passes leads to a significant grain size reduction from 0 way pass, the grain size is around 10 µm, while for a 4 way pass, the grain size is around 2.5 µm. The corrosion resistance of Al 6061 alloys increased with the increasing number of passes in ECAP process.

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Effect of ECAP Die Angles on Microstructure Mechanical Properties and Corrosion Behavior of AZ80 Mg Alloy

Cited by 40 publications

References 39 publications

Bio-corrosion impacts on mechanical integrity of ZM21 Mg for orthopaedic implant application processed by equal channel angular pressing

Bio-corrosion impacts on mechanical integrity of ZM21 Mg for orthopaedic implant application processed by equal channel angular pressing

Effect of ECAE Die Angle on Microstructure Mechanical Properties and Corrosion Behavior of AZ80/91 Magnesium Alloys

The Effect of Ecap Processing to Hardness, Surface Morphologi, and Corrosion Resistance of 6061 Aluminium Alloys

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