Thermal stability of extension twins in Mg-3Al-1Zn rods

Zhang, Hong; Yan, Changjian; Li, Changzheng; Xin, Yunchang; Qing, Liu

doi:10.1016/j.jallcom.2016.11.315

Cited by 17 publications

(2 citation statements)

References 21 publications

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“…This observation is likely related to the thermal stability of some special boundaries such as 86 11 20 extension twin boundaries. [48,49] IV. DISCUSSION…”

Section: E Evolution Of the Misorientation Distributionmentioning

confidence: 99%

On the Texture Weakening During Electropulse Annealing Treatment of Mg-1Ce Alloy: The Role of Nucleation and Nucleus Growth

Kuang

Al‐Samman

et al. 2020

Metall Mater Trans A

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Mg-1Ce alloys were pre-rolled at room temperature to various reductions to achieve different as-rolled microstructures. The deformed materials were then treated with a pulsed electric current (electropulse treatment, EPT) to study the effect of the as-rolled microstructure on the recrystallization texture formation. The experimental results show that an optimum window exists for pre-rolling reductions, within which the as-rolled microstructures and sharp basal textures obtained will evolve into fine recrystallized grains and weak textures during the subsequent EPT. Microstructure analysis indicates a competition between two processes, the nucleation and the nucleus growth, in contributing to the texture weakening of the alloy. While both the application of pulsed electric current and the increase in the pre-rolling reductions could strengthen the advantage of the nucleation rate of the non-basal nuclei over those with basal orientations, the contribution from nucleus growth depends mainly on the available deformed basal-oriented matrix, which decreases with increasing pre-rolling reductions. The results of the present study might provide useful guidance for the optimization of process parameters in the future application of the 'pre-rolling + EPT' technique on the Mg alloy sheet.

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“…This observation is likely related to the thermal stability of some special boundaries such as 86 11 20 extension twin boundaries. [48,49] IV. DISCUSSION…”

Section: E Evolution Of the Misorientation Distributionmentioning

confidence: 99%

On the Texture Weakening During Electropulse Annealing Treatment of Mg-1Ce Alloy: The Role of Nucleation and Nucleus Growth

Kuang

Al‐Samman

et al. 2020

Metall Mater Trans A

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“…Alternatively, research efforts were also focused on the twinning-induced performance enhancement through the post-weld deformation [13,14]. Nevertheless, the general weakness of this approach is the poor thermal stability and reduced ductility inherent to the cold-deformation substructure [14,15]. It seems likely therefore that an innovative texture regulation approach is urgently necessary.…”

Section: Introductionmentioning

confidence: 99%

Enhancing mechanical properties of friction stir welded AZ31 alloys by post-weld compression

Liu

Feng

et al. 2023

Science and Technology of Welding and Joining

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In this work, the friction stir welded AZ31 joint was processed by a two-step post-weld deformation (i.e. compression at room temperature and an elevated temperature, respectively). The microstructure, texture and mechanical properties were systematically investigated. Profuse extension twins were observed after the first-step cold compression along normal direction, which largely affected the dynamic recrystallisation process during the second-step hot compression. Finally, the grain orientations and their convergence on the weld side were effectively altered, thereby contributing substantially to the enhancement of joint performance. Compared to the original joint, the yield strength, ultimate tensile strength and elongation were improved 64.7%, 20.8% and 52.5%, respectively. The underline strengthening mechanism was discussed by a comprehensive analysis of Schmid factor and geometric compatibility factor.

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Development of a Heterogeneous Lamellar Structure Based on Layer Instabilities during Accumulative Roll Bonding

Zeng

Liang

2023

Adv Eng Mater

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The strategy of designing heterogeneous structures has emerged as a new tool in avoiding the prominent strength–ductility trade‐off dilemma in metallic materials. However, methods to reproducibly synthesize heterostructured materials with effective microstructural control are still elusive. Herein, a highly reproducible method based on conventional accumulative roll bonding (ARB) and postannealing is proposed for designing heterostructured Cu samples with precisely defined heterogeneous lamellar structure (HLS) wherein the size, volume fraction, and spatial distribution of coarse and fine grains can be accurately controlled. An optimal heterogeneous lamellar microstructure is found which gives rise to a roughly 3 times higher yield strength than that of coarse‐grained Cu and a good tensile ductility of ≈34.7% total elongation. Experimental observations reveal that the unique HLS induces strong heterodeformation‐induced hardening and promotes dislocation accumulation, leading to the observed exceptional strength–ductility synergy. This novel fabrication method is applicable to a considerably larger number of metal systems and can be utilized to further tailor HLS to optimize the mechanical properties of metals.

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Thermal stability of extension twins in Mg-3Al-1Zn rods

Cited by 17 publications

References 21 publications

On the Texture Weakening During Electropulse Annealing Treatment of Mg-1Ce Alloy: The Role of Nucleation and Nucleus Growth

On the Texture Weakening During Electropulse Annealing Treatment of Mg-1Ce Alloy: The Role of Nucleation and Nucleus Growth

Enhancing mechanical properties of friction stir welded AZ31 alloys by post-weld compression

Development of a Heterogeneous Lamellar Structure Based on Layer Instabilities during Accumulative Roll Bonding

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