Recrystallization mechanisms and microstructure development in emerging metallic materials: A review

Alaneme, Kenneth Kanayo; Okotete, Eloho Anita

doi:10.1016/j.jsamd.2018.12.007

Cited by 104 publications

(72 citation statements)

References 84 publications

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“…It is apparent that the obtained grain refinement is due to DRX during ECAP and they increase in many ECAP passes which result in much smaller grain structure. However, from this it is noticed that the alloy processed with 90 0 die shows smaller grain sizes than 110 0 die for both alloy, this is due to the accumulation of very large plastic strain while processing with a low angle die [19,20]. The calculated equivalent plastic strain for 110 0 to be ~0.742 and ~1.015 for 90 0 indeed, the strain developed by 4P ECAP through 90 0 die is higher than that of 110 0 die.…”

Section: Variation Of Grain Size With Two Different Die After 2 and 4mentioning

confidence: 81%

“…Finally, in general, AZ Mg alloy processed through die A and die B showed the same trend of decreasing grain size from the homogenized condition. By extruding in the die A, the mean grain size of AZ80 and AZ91 Mg alloy decreased by 35% and 22% when compared with material processed through die B [19,20]. Also, from the result, it was observed that AZ80 Mg alloy processed through die A at 598 K exhibited fine grain structure of about ~6.35 μm after four ECAP passes, which is lower when compared to ECAPed AZ91 Mg alloy processed at same processing temperature.…”

Section: Variation Of Grain Size With Two Different Die After 2 and 4mentioning

confidence: 90%

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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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Section: Variation Of Grain Size With Two Different Die After 2 and 4mentioning

confidence: 81%

Section: Variation Of Grain Size With Two Different Die After 2 and 4mentioning

confidence: 90%

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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“…The recrystallization of Ti-Zr-Nb powders is driven by the energy stored in the mechanically alloyed materials coming from multiple crystal defects in the dominant form of the dislocations coming from the plastic deformation of powders during milling. These types of defects are considered to be the main part of the stored energy [50]. These alloys should be considered as high stacking fault energy materials with dynamic recovery and continuous dynamic recrystallization (CDRX) [50,51].…”

Section: Discussionmentioning

confidence: 99%

“…These types of defects are considered to be the main part of the stored energy [50]. These alloys should be considered as high stacking fault energy materials with dynamic recovery and continuous dynamic recrystallization (CDRX) [50,51]. CDRX is the mechanism of low angle grain boundaries (LAGB) migration to the high angle grain boundaries (HAGB).…”

Section: Discussionmentioning

confidence: 99%

Crystal Structure Evolution, Microstructure Formation, and Properties of Mechanically Alloyed Ultrafine-Grained Ti-Zr-Nb Alloys at 36≤Ti≤70 (at. %)

et al. 2020

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Titanium β-type alloys are preferred biomaterials for hard tissue replacements due to the low Young modulus and limitation of harmful aluminum and vanadium present in the commercially available Ti6Al4V alloy. The aim of this study was to develop a new ternary Ti-Zr-Nb system at 36≤Ti≤70 (at. %). The technical viability of preparing Ti-Zr-Nb alloys by high-energy ball-milling in a SPEX 8000 mill has been studied. These materials were prepared by the combination of mechanical alloying and powder metallurgy approach with cold powder compaction and sintering. Changes in the crystal structure as a function of the milling time were investigated using X-ray diffraction. Our study has shown that mechanical alloying supported by cold pressing and sintering at the temperature below α→β transus (600°C) can be applied to synthesize single-phase, ultrafine-grained, bulk Ti(β)-type Ti30Zr17Nb, Ti23Zr25Nb, Ti30Zr26Nb, Ti22Zr34Nb, and Ti30Zr34Nb alloys. Alloys with lower content of Zr and Nb need higher sintering temperatures to have them fully recrystallized. The properties of developed materials are also engrossing in terms of their biomedical use with Young modulus significantly lower than that of pure titanium.

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“…6(a,d)). A low SFE also encourages recrystallization by increasing the driving force through the large stored elastic energy 24 , and hence may contribute to the increased recrystallized grain density of Cryo samples relative to the RT samples in (Fig. 4).…”

Section: Discussionmentioning

confidence: 99%

Excellent Combination of Tensile ductility and strength due to nanotwinning and a biamodal structure in cryorolled austenitic stainless steel

Kumar

Mangipudi

Sastry

et al. 2020

Sci Rep

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grains. The very short annealing periods prevented grain growth while still retaining good amount of dislocation density (Fig. 7). Similar observations were also reported in case of TWIP steels by Tewari et al. 28. conclusions The effect of Cryogenic and room temperature rolling on the strength and ductility of UNS S31000 austenitic stainless steel was investigated for 50% and 75% thickness reductions. A five-fold enhancement in the strength is observed under Cryorolled conditions while room temperature rolling has resulted in a four-fold increase. Extensive microstructural investigations using transmission electron microscopy and electron back scattered diffraction methods revealed the development of deformation nano-twins and dislocation cell walls, leading to a strength enhancement. While rolling resulted in severe reduction in ductility, flash annealing treatment between 800 °C and 850 °C for approximately two minutes has restored the ductility significantly, up to as high as 30%.

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Recrystallization mechanisms and microstructure development in emerging metallic materials: A review

Cited by 104 publications

References 84 publications

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

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

Crystal Structure Evolution, Microstructure Formation, and Properties of Mechanically Alloyed Ultrafine-Grained Ti-Zr-Nb Alloys at 36≤Ti≤70 (at. %)

Excellent Combination of Tensile ductility and strength due to nanotwinning and a biamodal structure in cryorolled austenitic stainless steel

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