Grain refinement of magnesium alloys by dynamic recrystallization (DRX): A review

Mirzadeh, Hamed

doi:10.1016/j.jmrt.2023.07.150

Cited by 86 publications

(10 citation statements)

References 362 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A fine-grained microstructure can facilitate the formation of more uniform and protective oxide or hydroxide films on the surface of a magnesium alloy; we believe this is one of the predominant mechanisms that were shown by many authors for other types of Mgbased alloys [49]. These films act as barriers that prevent the ingress of corrosive species, thereby improving corrosion resistance.…”

Section: Discussionmentioning

confidence: 79%

Severe Plastic Deformation of Mg–Zn–Zr–Ce Alloys: Advancing Corrosion Resistance and Mechanical Strength for Medical Applications

Luginin,

Eroshenko,

Khimich

et al. 2023

Metals

View full text Add to dashboard Cite

Magnesium-based alloys hold potential for medical applications, but face challenges like rapid bioresorption and limited mechanical strength during early bone healing. In our study, we present a novel Mg–Zn–Zr–Ce alloy with low cerium content (up to 0.1 wt.% Ce) processed using two severe plastic deformation (SPD) techniques. Through an innovative combination of multiaxial forging and multipass rolling, we have achieved a fine-grained structure with an average grain size of the primary α-Mg phase of 1.0 μm. This refined microstructure exhibits improved mechanical properties, including a substantial increase in yield strength (σYS) from 130 to 240 MPa, while preserving ductility. The alloy’s composition includes α-Mg grains, cerium and zinc hydrides, and intermetallic phases with cerium and zinc elements. Tensile testing of the fine-grained alloy demonstrates an enhancement in yield strength (σYS) to 250 MPa, marking a 2.8-fold improvement over the conventional state (σYS = 90 MPa), with a modest 2-fold reduction in ductility. Crucially, electrochemical tests conducted in physiological solutions highlight substantial advancements in corrosion resistance. The corrosion current was reduced from 14 to 2 μA/cm2, while polarization resistance decreased from 3.1 to 8.1 kΩ∙cm2, underlining the alloy’s enhanced resistance to biodegradation. Our results show that the novel Mg–Zn–Zr–Ce alloy, after combined SPD, demonstrates mitigated bioresorption and enhanced mechanical properties. Our findings highlight the fact that the introduction of this innovative alloy and the application of SPD represent significant steps towards addressing the limitations of magnesium-based alloys for medical implants, offering potential improvements in safety and effectiveness.

show abstract

Section: Discussionmentioning

confidence: 79%

Severe Plastic Deformation of Mg–Zn–Zr–Ce Alloys: Advancing Corrosion Resistance and Mechanical Strength for Medical Applications

Luginin,

Eroshenko,

Khimich

et al. 2023

Metals

View full text Add to dashboard Cite

show abstract

“…In summary, the flow stress curve of the Mg-13Gd-4Y-2Zn-0.5Zr alloy exhibits typical characteristics of a dynamic recrystallization-type curve. The thermal processing parameters, such as the deformation temperature and strain rate, significantly influenced the dynamic recrystallization behavior of the alloy, with higher temperatures and lower strain rates favoring dynamic recrystallization [4].…”

Section: Resultsmentioning

confidence: 99%

“…The process of dynamic recrystallization, which serves as a significant organizational evolution characteristic during the thermal deformation of rare-earth magnesium alloys, is intricately influenced by the interplay of processing parameters, including the deformation temperature, strain rate, and deformation magnitude. These factors exert substantial impacts on both the microstructure and mechanical properties across different stages of material deformation [4,5]. However, depending solely on experimental techniques for ascertaining the optimal forming process parameters proves to be both expensive and time-intensive.…”

Section: Introductionmentioning

confidence: 99%

Study of the Dynamic Recrystallization Behavior of Mg-Gd-Y-Zn-Zr Alloy Based on Experiments and Cellular Automaton Simulation

Cheng,

Wu,

Zhang

2024

Metals

View full text Add to dashboard Cite

The exploration of the relationship between process parameters and grain evolution during the thermal deformation of rare-earth magnesium alloys using simulation software has significant implications for enhancing research and development efficiency and advancing the large-scale engineering application of high-performance rare-earth magnesium alloys. Through single-pass hot compression experiments, this study obtained high-temperature flow stress curves for rare-earth magnesium alloys, analyzing the variation patterns of these curves and the softening mechanism of the materials. Drawing on physical metallurgical theories, such as the evolution of dislocation density during dynamic recrystallization, recrystallization nucleation, and grain growth, the authors of this paper establish a cellular automaton model to simulate the dynamic recrystallization process by tracking the sole internal variable—the evolution of dislocation density within cells. This model was developed through the secondary development of the DEFORM-3D finite element software. The results indicate that the model established in this study accurately simulates the evolution process of grain growth during heat treatment and the dynamic recrystallization microstructure during the thermal deformation of rare-earth magnesium alloys. The simulated results align well with relevant theories and metallographic experimental results, enabling the simulation of the dynamic recrystallization microstructure and grain size prediction during the deformation process of rare-earth magnesium alloys.

show abstract

“…Under the 1 s −1 strain rate conditions, the necklace-like distribution of fine DRX grains along the grain boundaries in figure 3(a). It indicates that at this stage mainly proceeds as DDRX [18,19]. The increase in temperature provides energy for grain boundary migration, and the fine grains distributed along the grain boundaries show a growth trend (figure 3(b)).…”

Section: Microstructure Analysismentioning

confidence: 97%

Thermal deformation behavior and microstructure analysis of the as-cast super austenitic stainless steel Sanicro35

Li,

Zhao

et al. 2024

Mater. Res. Express

View full text Add to dashboard Cite

Uniaxial thermal compression of the super austenitic stainless steel Sanicro35. The thermal deformation behavior was investigated under the conditions of 900~1150 ℃ deformation temperature and 0.001~10 s-1 strain rate. The microstructure of the large deformation zone of the specimen was investigated using electron backscatter diffraction (EBSD). The results show that the thermal compression rheological stress of the super austenitic stainless steel Sanicro 35 decreases with increasing temperature and decreasing strain rate. Dynamic recrystallization (DRX) is the main softening mechanism for this material. The analysis of the microstructure by EBSD on the morphological features, recrystallization fraction, dislocation density and twin boundary distribution can be found that the higher grain boundary mobility drives the DRX grains to grow with the deformation temperature increases. As the strain rate increases, the larger deformation storage energy provides sufficient activation energy for DRX grain nucleation, and the nucleation of DRX grains becomes denser. The twin boundaries are mainly distributed within the DRX grains. The smaller the grain size of DRX, the denser the nucleation of twin boundaries, and the generation of twins can promote the development of DRX. The softening mechanism under most deformation conditions is discontinuous dynamic recrystallization (DDRX). However, at a strain rate of 10 s-1, the high strain rate causes microbands to be generated within the deformed grains, and the microband boundaries evolve toward the high-angle grain boundaries (HAGBs) with increasing temperature, which promotes the occurrence of Continuous dynamic recrystallization (CDRX), and the dynamic softening mechanism is the coexistence of DDRX and CDRX. The results of the study show that the reasonable hot working deformation region is: temperature of 1050-1150 ℃ and strain rate of 10 s-1.

show abstract

Grain refinement of magnesium alloys by dynamic recrystallization (DRX): A review

Cited by 86 publications

References 362 publications

Severe Plastic Deformation of Mg–Zn–Zr–Ce Alloys: Advancing Corrosion Resistance and Mechanical Strength for Medical Applications

Severe Plastic Deformation of Mg–Zn–Zr–Ce Alloys: Advancing Corrosion Resistance and Mechanical Strength for Medical Applications

Study of the Dynamic Recrystallization Behavior of Mg-Gd-Y-Zn-Zr Alloy Based on Experiments and Cellular Automaton Simulation

Thermal deformation behavior and microstructure analysis of the as-cast super austenitic stainless steel Sanicro35

Contact Info

Product

Resources

About