Hot deformation and processing map of an as-extruded Mg–Zn–Mn–Y alloy containing I and W phases

Tahreen, N.; Zhang, D.F.; Pan, Fusheng; Jiang, Xianquan; Li, D.Y.; Chen, D.L.

doi:10.1016/j.matdes.2015.08.023

Cited by 77 publications

(15 citation statements)

References 76 publications

(109 reference statements)

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“…Several recent studies showed that ZEK100 Mg alloy exhibited superior room temperature formability [31][32][33][34] and fatigue resistance [35,36]. The corrosion resistance of Mg alloys can also be effectively improved by addition of rare earth (RE) elements [37][38][39][40]. Wielage et al [41] and Ishak et al [42] studied the corrosion behavior of welded joints, and they observed that the corrosion resistance was mainly determined by the base metals.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Ultrasonic Spot Welded Mg/Al Alloy Dissimilar Joints

Jiang

Bai

et al. 2018

Metals

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Lightweight structural applications of magnesium and aluminum alloys inevitably necessitate welding and joining, especially dissimilar welding between these alloys. The objective of this study was to examine the feasibility of joining ZEK100 Mg alloy to Al6022 alloy via ultrasonic spot welding, focusing on effects of welding energy. An interface diffusion layer consisting of α-Mg and Al 12 Mg 17 eutectic structure was observed to form, with its thickness increased from~0.5 µm tõ 30 µm with increasing welding energy from 500 J to 2000 J. The tensile lap shear peak load or strength and critical stress intensity of the welded joints first increased and then decreased with increasing welding energy, with their peak values achieved at 750 J. Fatigue life of the joints made at 750 J and 2000 J was equivalent at the lower cyclic loading levels, while it was longer for the joints made at 750 J at the higher cyclic loading levels. Fatigue fracture mode changed from interfacial failure to mainly transverse-through-thickness crack growth with decreasing cyclic loading level, which corresponded well to the bi-linear characteristic of S-N curves. Crack initiation basically occurred at the weld nugget border and at the interface between the two sheets, which can be understood via a theoretical stress analysis.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Ultrasonic Spot Welded Mg/Al Alloy Dissimilar Joints

Jiang

Bai

et al. 2018

Metals

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“…The activation energy Q, is generally related to the thermodynamic mechanism of dislocation movement and can reveal the workability of materials [165]. It is in fact a measure of the minimum energy required to initiate dislocation movement by diffusion, and is considered to be an important physical parameter indicating the degree of difficulty to deform a material under specific deformation conditions [166]. Activation energy could be determined after taking partial differential of Equ.…”

Section: Activation Energy Of Hot Deformationmentioning

confidence: 99%

Deformation behavior in lightweight alloys: effects of rare-earth microalloying and carbon nanotube reinforcement

Mokdad¹

2021

Preprint

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One of the most important strategies for improving fuel efficiency and reducing anthropogenic emissions is vehicle lightweighting by the use of lightweight materials such as Mg and Al alloys in the automotive industry. The structural application of these alloys inevitably requires the mechanical properties and their continuous performance improvement to meet the increasingly stringent safety and durability requirements. An effective method to enhance the deformation resistance is to alloy with rare-earth (RE) elements for Mg alloys or develop composites with the addition of reinforcement for Al alloys. The objective of this dissertation was to identify the effects of RE element and carbon nanotube (CNT) reinforcement on the deformation behavior, focusing mainly on the deformation mechanisms. The deformation behavior of a RE-free extruded AZ31 Mg alloy was first studied. It was observed that the propagation of distinct twin variants led to the confinement of the spaces constrained by the fine twin lamellas. Various double twinning structures acknowledged through atomistic simulations were experimentally observed via progressive electron backscatter diffraction (EBSD) analyses during stepwise compression. The vanishing of primary {1121} embryonic twins via the nucleation and growth of either single or multiple {1012} secondary extension twins was detected, and two new ladder-like and branching-like twin-twin interaction phenomena were observed. Then a low-RE containing Mg alloy was exploited via texture and cyclic deformation studies. The addition of 0.2 wt.% Nd in ZEK100-O Mg alloy led to a weaker basal texture in comparison with AZ31 Mg alloy. Fatigue life of ZEK100 alloy was longer than that of AZ31 alloy, due to a good combination of strength with ductility. Asymmetry of hysteresis loops was improved because of texture weakening and grain refinement, however anelastic behavior largely remained arising from the presence of twinning and detwinning. The last investigation involved deformation behavior of CNT reinforced Al composites where the addition of 2.0 wt.% CNT in a 2024Al alloy led to considerable grain refinement. Deformation resistance of the composite was effectively enhanced due to CNT load transfer, Hall-Petch strengthening, thermal mismatch and Orowan looping. In a nutshell, this work constitutes a valuable benchmark for understanding the factors affecting the performance of two lightweight alloys in the automotive and aerospace applications.

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“…A decrease in the ε c and ε p values of MZC and MZCM is also observed with increasing deformation temperature under the same strain rate. A high deformation temperature promotes annihilation and rearrangement of dislocations at grain boundaries [33], which boosts the nucleation and growth rate of DRX grains. Meanwhile, a higher temperature decreases the critical resolved shear stress (CRSS) of the non-basal slip system [34] of HCP structure alloy, which decreases the work-hardening effects by enhancing the cross slipping in the alloy.…”

Section: Crystal Analysismentioning

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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Hot deformation and processing map of an as-extruded Mg–Zn–Mn–Y alloy containing I and W phases

Cited by 77 publications

References 76 publications

Microstructure and Mechanical Properties of Ultrasonic Spot Welded Mg/Al Alloy Dissimilar Joints

Microstructure and Mechanical Properties of Ultrasonic Spot Welded Mg/Al Alloy Dissimilar Joints

Deformation behavior in lightweight alloys: effects of rare-earth microalloying and carbon nanotube reinforcement

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

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