High temperature deformation behavior of Mg-5wt.%Y binary alloy: Constitutive analysis and processing maps

Ansari, Nooruddin; Tran, Brian; Poole, Warren J.; Singh, Sudhanshu S.; Hariharan, K.; Jain, Jayant

doi:10.1016/j.msea.2020.139051

Cited by 48 publications

(2 citation statements)

References 41 publications

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“…Consequently, the apparent Q-value and the strain rate sensitivity parameter 1/n are 116.483 kJ/mol and 0.134, respectively. The obtained value of Q for LA11 in this study is smaller than that of the conventional AZ80 [2] (215.82 kJ/mol) and Mg-5Y binary alloy [24] (200.93 kJ/mol). Moreover, others reported the Q-value of the as-cast β-phase Mg-Li alloy was 95 kJ/mol [25], and that of the rolled α-phase Mg-Li alloy was 211 kJ/mol [26].…”

Section: Constitutive Modelcontrasting

confidence: 67%

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

Feng

Pang

et al. 2021

Metals

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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.

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Section: Constitutive Modelcontrasting

confidence: 67%

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

Feng

Pang

et al. 2021

Metals

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“…When the alloy behaves as a power dissipator in the process of hot deformation, the generated power is mainly dissipated through plastic deformation and microstructural evolution. According to the dynamic materials model, power dissipation efficiency (η) is defined as the characteristic of power dissipation of microstructural evolution during hot deformation, which is expressed as [24]:…”

Section: Processing Mapsmentioning

confidence: 99%

Insight into the Role and Mechanism of Nano MgO on the Hot Compressive Deformation Behavior of Mg-Zn-Ca Alloys

Zheng

Lyu

et al. 2020

Metals

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Aiming to investigate the role and mechanism of nano MgO on the hot compressive deformation behavior of Mg alloys, the Mg-3Zn-0.2Ca alloy (MZC, in wt%) and the 0.2MgO/Mg-3Zn-0.2Ca alloy (MZCM, in wt%) were investigated systematically in the temperature range of 523–673 K and the strain rate range of 0.001–1 s−1. MZCM shows finer grains and second phase because of the refinement effects of added MgO. Flow behavior analysis shows that the addition of nano MgO promotes the dynamic recrystallization (DRX) of MZC. The flow stress of MZCM is lower than that of MZC during deformation at 523–623 K but exhibits a reverse trend at 673 K and 0.1–1 s−1. The constitutive analysis indicates that dislocation climb is the dominant deformation mechanism for MZC and MZCM. The addition of nano MgO particles decreases the stress sensitivity and deformation resistance for thermal deformation and improves the plasticity of the MZC. Besides, according to the processing map constructed at strains of 0.7 and corresponding microstructure evolution, MZCM exhibits higher power dissipation efficiency and smaller instability regions than MZC, and the optimum hot working condition for MZCM was determined to be at 623–653 K and 0.01–0.001 s−1.

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