Microstructure evolution of twinning-induced shear bands and correlation with ‘RD-split’ texture during hot rolling in a Mg-1.1Zn-0.76Y-0.56Zr alloy

Shi, Baoping; Wang, Y.Z.; Shang, Xiaoqing; Ling, Zhao; Li, C.Q.; Chen, D.C.; Nie, Baohua; Chen, Rongshi; Ke, Wei

doi:10.1016/j.matchar.2022.111853

Cited by 20 publications

(3 citation statements)

References 55 publications

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“…Also, twin-induced ASBs have been reported in a hot-rolled Mg-1.1Zn alloy [103] and a Mg-Al-Mn alloy subjected to a ballistic impact [104], in boundaries as favorable positions for shear localization. More specifically, t of closely neighboring twins under a high strain rate results in shear defor zation along twin boundaries instead of widening of the twins, leading to A Moreover, the presence of pre-existing twins in the initial microstruct material propensity against ASB formation.…”

Section: Twinning Effectmentioning

confidence: 99%

A Review on the Adiabatic Shear Banding Mechanism in Metals and Alloys Considering Microstructural Characteristics, Morphology and Fracture

Karantza,

Manolakos

2023

Metals

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The current review work studies the adiabatic shear banding (ASB) mechanism in metals and alloys, focusing on its microstructural characteristics, dominant evolution mechanisms and final fracture. An ASB reflects a thermomechanical deformation instability developed under high strain and strain rates, finally leading to dynamic fracture. An ASB initially occurs under severe shear localization, followed by a significant rise in temperature due to high strain rate adiabatic conditions. That temperature increase activates thermal softening and mechanical degradation mechanisms, reacting to strain instability and facilitating micro-voiding, which, through its coalescence, results in cracking failure. This work aims to summarize and review the critical characteristics of an ASB’s microstructure and morphology, evolution mechanisms, the propensity of materials against an ASB and fracture mechanisms in order to highlight their stage-by-stage evolution and attribute them a more consecutive behavior rather than an uncontrollable one. In that way, this study focuses on underlining some ASB aspects that remain fuzzy, allowing for further research, such as research on the interaction between thermal and damage softening regarding their contribution to ASB evolution, the conversion of strain energy to internal heat, which proved to be material-dependent instead of constant, and the strain rate sensitivity effect, which also concerns whether the temperature rise reflects a precursor or a result of ASB. Except for conventional metals and alloys like steels (low carbon, stainless, maraging, armox, ultra-high-strength steels, etc.), titanium alloys, aluminum alloys, magnesium alloys, nickel superalloys, uranium alloys, zirconium alloys and pure copper, the ASB propensity of nanocrystalline and ultrafine-grained materials, metallic-laminated composites, bulk metallic glasses and high-entropy alloys is also evaluated. Finally, the need to develop a micro-/macroscopic coupling during the thermomechanical approach to the ASB phenomenon is pointed out, highlighting the interaction between microstructural softening mechanisms and macroscopic mechanical behavior during ASB evolution and fracture.

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Section: Twinning Effectmentioning

confidence: 99%

A Review on the Adiabatic Shear Banding Mechanism in Metals and Alloys Considering Microstructural Characteristics, Morphology and Fracture

Karantza,

Manolakos

2023

Metals

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“…Moreover, a typical "RD-spilt" texture component was observed in all of the regions. This "RD-spilt" feature has been reported in many rolled or extruded Mg-RE alloys, which is related to the activation of pyramidal <c+a> slips and the occurrence of double twins [19,29,[34][35][36].…”

Section: Microstructure and Texture Of The As-hot-rolled Samplementioning

confidence: 67%

“…With increasing strain, the volume fraction of CTWs and DTWs increases while that of TTWs decreases. Moreover, under large strains, non-basal slips are enhanced [18], followed by the formation of high-density shear bands [19,20]. Therefore, the deformed microstructures have a substantial effect on the subsequent recrystallization nucleation and grain growth in Mg alloys [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Texture Evolution of Hot-Rolled Mg-3Gd Alloy during Recrystallization

Han

Wang

Luo

et al. 2023

Metals

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An Mg-3Gd (wt.%) sample with gradient rolling strains (ε = 0–0.55) was prepared using a wedge-shaped plate after one-pass hot rolling, allowing a high-throughput characterization of microstructure and texture over a wide strain range within one hot-rolled plate. The microstructure and texture evolutions were characterized as a function of rolling strain for the as-hot-rolled sample and as a function of annealing temperature for the subsequently annealed samples. The deformed microstructure showed a gradual change with increasing rolling strain, i.e., from a deformation twins-dominant structure in the low strain range of 0–0.20, to a shear bands-dominant structure in the higher strain range of 0.20–0.55. The recrystallization behavior during annealing showed a clear correlation between the recrystallization nucleation site and the deformed microstructure. However, a weak recrystallization texture with non-basal texture components was formed over almost the entire strain range. This work demonstrates a high-throughput experimental strategy using a wedge-shaped sample to investigate the effect of various processing parameters, such as strain and annealing temperature, on the evolution of microstructure, texture, and mechanical properties, which could accelerate the optimization of processing parameters and microstructural design.

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Texture Control Techniques for Improving Room Temperature Formability of Mg Alloys including Pre-twinning: A Review

et al. 2023

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Microstructure evolution of twinning-induced shear bands and correlation with ‘RD-split’ texture during hot rolling in a Mg-1.1Zn-0.76Y-0.56Zr alloy

Cited by 20 publications

References 55 publications

A Review on the Adiabatic Shear Banding Mechanism in Metals and Alloys Considering Microstructural Characteristics, Morphology and Fracture

A Review on the Adiabatic Shear Banding Mechanism in Metals and Alloys Considering Microstructural Characteristics, Morphology and Fracture

Microstructure and Texture Evolution of Hot-Rolled Mg-3Gd Alloy during Recrystallization

Texture Control Techniques for Improving Room Temperature Formability of Mg Alloys including Pre-twinning: A Review

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