Transitions in mechanical behavior and in deformation mechanisms enhance the strength and ductility of Mg-3Gd

Luo, Xuan; Feng, Zongqiang; Yu, Tianbo; Luo, Junqian; Huang, Tianlin; Wu, Guilin; Hansen, Niels; Huang, Xiaoxiao

doi:10.1016/j.actamat.2019.11.034

Cited by 169 publications

(23 citation statements)

References 57 publications

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“…For example, the concept of grain boundary engineering (GBE) by increasing the fraction of special or low Σ CSL boundaries of metals is based on the different structures and energies from random high angle boundaries [ 23 , 24 , 25 ]. On the other hand, the mechanical properties of Mg alloy has been improved by transition of deformation mechanism from twinning and <a> slip to <c + a> slip [ 161 , 162 ]. This is because the <c + a> slip system of Mg alloy has more independent slip directions than those of <a> slip system, which reduce the stress concentration induced by the dislocation–boundary interaction and increase its plasticity.…”

Section: Applications and Characterization Techniquesmentioning

confidence: 99%

Interactions between Dislocations and Boundaries during Deformation

Pan

Zhang

2021

Materials

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The interactions between dislocations (dislocations and deformation twins) and boundaries (grain boundaries, twin boundaries and phase interfaces) during deformation at ambient temperatures are reviewed with focuses on interaction behaviors, boundary resistances and energies during the interactions, transmission mechanisms, grain size effects and other primary influencing factors. The structure of boundaries, interactions between dislocations and boundaries in coarse-grained, ultrafine-grained and nano-grained metals during deformation at ambient temperatures are summarized, and the advantages and drawbacks of different in-situ techniques are briefly discussed based on experimental and simulation results. The latest studies as well as fundamental concepts are presented with the aim that this paper can serve as a reference in the interactions between dislocations and boundaries during deformation.

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Section: Applications and Characterization Techniquesmentioning

confidence: 99%

Interactions between Dislocations and Boundaries during Deformation

Pan

Zhang

2021

Materials

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“…Magnesium (Mg) and its alloys possess great potential to improve energy efficiency in electronics, automotive and aerospace industries due to its ultra-low density [ 50 , 66 ]. However, as a typical hexagonal close-packed (HCP) metal with insufficient slip systems, Mg and its alloys are intractable to be plastically deformed at room temperature [ 67 ]. A plethora of literature reiterated that activating the <c+a> pyramidal slip is an effective method to improve their formability [ 40 , 66 , 67 , 68 ].…”

Section: Gradient Micro-hardness and Microstructures By Rotary Swagingmentioning

confidence: 99%

“…However, as a typical hexagonal close-packed (HCP) metal with insufficient slip systems, Mg and its alloys are intractable to be plastically deformed at room temperature [ 67 ]. A plethora of literature reiterated that activating the <c+a> pyramidal slip is an effective method to improve their formability [ 40 , 66 , 67 , 68 ].…”

Section: Gradient Micro-hardness and Microstructures By Rotary Swagingmentioning

confidence: 99%

Nano-Gradient Materials Prepared by Rotary Swaging

Chen

Zhao

2021

Nanomaterials

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Gradient nanostructured metallic materials with a nanostructured surface layer show immense potential for various industrial applications because of their outstanding mechanical, fatigue, corrosion, tribological properties, etc. In the past several decades, various methods for fabricating gradient nanostructure have been developed. Nevertheless, the thickness of gradient microstructure is still in the micrometer scale due to the limitation of preparation techniques. As a traditional but potential technology, rotary swaging (RS) allows gradient stress and strain to be distributed across the radial direction of a bulk cylindrical workpiece. Therefore, in this review paper, we have systematically summarized gradient and even nano-gradient materials prepared by RS. We found that metals processed by RS usually possess inverse nano-gradient, i.e., nano-grains appear in the sample center, texture-gradient and dislocation density-gradient along the radial direction. Moreover, a broad gradient structure is distributed from center to edge of the whole processed rods. In addition, properties including micro-hardness, conductivity, corrosion, etc., of RS processed metals are also reviewed and discussed. Finally, we look forward to the future prospects and further research work for the RS processed materials.

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“…Fig. 1 shows the tensile YS vs. (grain size) −1/2 (d −1/2 ) plots of Mg-3Al-1Zn [34][35][36][37][38][39][40], Mg-9Al(-1Zn) [41][42][43][44][45][46][47][48], and Mg-3Gd [49] alloys. Notably, the obtained data points conform to the Hall-Petch relationship.…”

Section: Influence Of Grain Size On the Strength Of Mg Alloysmentioning

confidence: 99%

“…Although tension twinning (i.e., twinning) can run through the grain and improve ductility, the coordination of all of the strains within grains is still impossible (i.e., the plastic strain due to twinning is only 7% at most [62]) [63]. Razavi et al [34] Wang et al [35] Ma et al [36] Gzyl et al [37] Zhao et al [38] Valle et al [39] Yuan et al [40] Liu et al [41] Li et al [42] Park et al [43] Nie et al [44] Ma et al [45] Ding et al [46] Prado et al [47] Mabuchi et al [48] (3) High CRSS and unfavorable transition of <c + a> dislocations.…”

Section: {1012}mentioning

confidence: 99%

Toward the development of Mg alloys with simultaneously improved strength and ductility by refining grain size via the deformation process

Zhang

Wang

et al. 2020

Int J Miner Metall Mater

135

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Magnesium (Mg) alloys, as the lightest metal engineering materials, have broad application prospects. However, the strength and ductility of traditional Mg alloys are still relativity low and difficult to improve simultaneously. Refining grain size via the deformation process based on the grain boundary strengthening and the transition of deformation mechanisms is one of the feasible strategies to prepare Mg alloys with high strength and high ductility. In this review, the effects of grain size on the strength and ductility of Mg alloys are summarized, and fine-grained Mg alloys with high strength and high ductility developed by various severe plastic deformation technologies and improved traditional deformation technologies are introduced. Although some achievements have been made, the effects of grain size on various Mg alloys are rarely discussed systematically and some key mechanisms are unclear or lack direct microscopic evidence. This review can be used as a reference for further development of high-performance fine-grained Mg alloys.

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Transitions in mechanical behavior and in deformation mechanisms enhance the strength and ductility of Mg-3Gd

Cited by 169 publications

References 57 publications

Interactions between Dislocations and Boundaries during Deformation

Interactions between Dislocations and Boundaries during Deformation

Nano-Gradient Materials Prepared by Rotary Swaging

Toward the development of Mg alloys with simultaneously improved strength and ductility by refining grain size via the deformation process

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