Dynamic Deformation Behaviour and Dislocation Substructure of AZ80 Magnesium Alloy over a Wide Range of Temperatures

Lee, Woei Shyan; Chou, Cheng Wen

doi:10.1051/epjconf/201818303010

Cited by 6 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, later experiments show different results (Hautojärvi et al, 1982;Abdelrahman & Badawi, 1996;Lambri et al, 2007). It is possible that severely deformed Mg materials may generate a cellular sub-structure, as indicated by experiments (Lee & Chou, 2018;Li et al, 2008), creating zones that are nearly dislocation-free, resulting in a longer lifetime for vacancies and vacancy clusters that may enhance interplay with solutes.…”

Section: Density Of Dislocations and Vacanciesmentioning

confidence: 99%

Strengthening magnesium by design: integrating alloying and dynamic processing

Prameela¹,

Peng²,

Hollenweger³

et al. 2021

Preprint

View full text Add to dashboard Cite

Magnesium (Mg) has the lowest density of all structural metals and has excellent potential for wide use in structural applications. While pure Mg has inferior mechanical properties; the addition of further elements at various concentrations has produced alloys with enhanced mechanical performance and corrosion resistance. An important consequence of adding such elements is that the saturated Mg matrix can locally decompose to form solute clusters and intermetallic particles, often referred to as precipitates. Controlling the shape, number density, volume fraction, and spatial distribution of solute clusters and precipitates significantly impacts the alloy's plastic response. Conversely, plastic deformation during thermomechanical processing can dramatically impact solute clustering and precipitation. In this paper, we first discuss how solute atoms, solute clusters, and precipitates can improve the mechanical properties of Mg alloys. We do so by primarily comparing three alloy systems: Mg-Al, Mg-Zn, and Mg-Y-based alloys. In the second part, we provide strategies for optimizing such microstructures by controlling nucleation and growth of solute clusters and precipitates during thermomechanical processing. In the third part, we briefly highlight how one can enable inverse design of Mg alloys by a more robust Integrated Computational Materials Design (ICMD) approach.

show abstract

Section: Density Of Dislocations and Vacanciesmentioning

confidence: 99%

Strengthening magnesium by design: integrating alloying and dynamic processing

Prameela¹,

Peng²,

Hollenweger³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Magnesium (Mg) alloys are ideal for transportation and aerospace industries due to their low density, high specific strength, high specific stiffness and good damping capacity [1,2]. However, magnesium alloys have poor deformability at room temperature because of the lack of sufficient independent slip systems during plastic deformation, which is attributed to the hexagonal close-packed (HCP) structure [3,4].…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Dynamic Recrystallization of Mg-1Li-1Al Alloy

Feng

Pang

et al. 2021

Metals

View full text Add to dashboard Cite

In this paper, the hot workability of Mg-1Li-1Al (LA11) alloy is assessed through a uniaxial compression test in a temperature range from 200 to 400 °C and a strain rate, έ, of 1–0.01 s−1. The present study reveals that flow stress increases when the strain rate increases and deformation temperature decreases. Based on the hyperbolic sine equation, the flow stress constitutive equation of this alloy under high-temperature deformation is established. The average activation energy was 116.5 kJ/mol. Avrami equation was employed to investigate the dynamic recrystallization (DRX). The DRX mechanism affected by the deformation conditions and Zener–Hollomon parameters is revealed. Finally, the relationship between DRX volume fraction and deformation parameter is verified based on microstructure evolution, which is consistent with the theoretical prediction.

show abstract

“…During traditional processing, vacancies in Mg can diffuse to sinks rapidly because basal dislocations are typically distributed uniformly, as compared to the cellular dislocation sub-structures in Al [11,21]. However, experimental evidence exists that SPD could also create cellular sub-structure in Mg alloys which could allow vacancies to segregate into clusters, as seen in Al alloys [22,23].…”

mentioning

confidence: 99%

The Interplay Between Solute Atoms and Vacancy Clusters in Magnesium Alloys

Yi¹,

Sasaki²,

Prameela³

et al. 2021

Preprint

View full text Add to dashboard Cite

Atomic-scale calculations indicate that both stress effects and chemical binding contribute to the redistribution of solute in the presence of vacancy clusters in magnesium alloys. As the size of the vacancy cluster increases, chemical binding becomes more important relative to stress. By affecting the diffusivity of vacancies and vacancy clusters, solute atoms facilitate clustering and stabilize the resulting vacancy clusters, increasing their potential to promote solute segregation and to serve as heterogeneous nucleation sites during precipitation. Experimental observation of solute segregation in simultaneously deformed and aged Mg-Al alloys provides support for this mechanism.

show abstract

Dynamic Deformation Behaviour and Dislocation Substructure of AZ80 Magnesium Alloy over a Wide Range of Temperatures

Cited by 6 publications

References 11 publications

Strengthening magnesium by design: integrating alloying and dynamic processing

Strengthening magnesium by design: integrating alloying and dynamic processing

Deformation Behavior and Dynamic Recrystallization of Mg-1Li-1Al Alloy

The Interplay Between Solute Atoms and Vacancy Clusters in Magnesium Alloys

Contact Info

Product

Resources

About