Impression creep behavior of the extruded Mg–4Zn–0.5Ca and Mg–4Zn–0.5Ca–2RE alloys

Naghdi, F.; Mahmudi, R.

doi:10.1016/j.msea.2014.08.031

Cited by 20 publications

(12 citation statements)

References 44 publications

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“…The calculated hot deformation activation energy Q of the Mg-4Sn-1.5Pb alloy is 158.144 KJ/mol. Which is very close to the activation energy Q L for the lattice diffusion in pure Mg, i. e. , 135 KJ/mol [11]. Taking both Q and n into our consideration, it is therefore concluded that the deformation mechanism of the Mg-4Sn-1.5Pb alloy is lattice diffusion controlled dislocation climb.…”

Section: Resultssupporting

confidence: 68%

“…One explanation is the threshold stress disappears because of the process not associated with the threshold stress dominates the other. Another explanation is as the temperature increases, the transition from athermal to thermally activated detachment of dislocations from small incoherent particles occured [11][12][13]. Fig.3 Temperature dependence of threshold stresses in Mg-4Sn-1.5Pb alloy…”

Section: Resultsmentioning

confidence: 99%

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Deformation Mechanism of Mg-4Sn-1.5Pb Alloy

Teng¹,

Zhang²,

Wang³

et al. 2014

Proceedings of the 2015 International Conference on Material Science and Applications

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Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Deformation Mechanism of Mg-4Sn-1.5Pb Alloy

Teng¹,

Zhang²,

Wang³

et al. 2014

Proceedings of the 2015 International Conference on Material Science and Applications

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“…As can be seen in Figure 2(b), most of the second-phase particles are aligned in the extrusion direction. These second-phase particles were identified as Ca 2 Mg 6 Zn 3 [25] and had a volume fraction of about 5%.…”

Section: Methodsmentioning

confidence: 99%

Contributions of different strengthening mechanisms to the shear strength of an extruded Mg–4Zn–0.5Ca alloy

Naghdi

Mahmudi

Kang

et al. 2015

Philosophical Magazine

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The shear deformation behaviour of an extruded Mg-4Zn-0.5Ca alloy was studied using shear punch testing at room temperature. The extrusion process effectively refined the microstructure, leading to a grain size of 4.6 ± 1.4 μm.Contributions of different strengthening mechanisms to the room temperature shear yield stress, and overall flow stress of the material, were calculated. These mechanisms include dislocation strengthening, grain boundary strengthening, solid solution hardening and strengthening resulting from second-phase particles. Grain boundary strengthening and solid solution hardening made significant contributions to the overall strength of the material, while the contributions of second-phase particles and dislocations were trivial. The observed differences between calculated and experimental strength values were discussed based on the textural softening of the material.

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“…For most materials C 1 ≈ 3 and C 2 ≈ 1. 22,23,28,[30][31][32] But these stress conversion factor values do not influence the calculation of stress exponent and activation energy. 20 Power-law for a material undergoing creep is given by…”

Section: Impression Creep Parametersmentioning

confidence: 99%

High temperature impression creep behavior and microstructures of wrought ZM21 magnesium alloy

Ebenezer¹,

Rao²,

Vijayan³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Mg-Zn alloys are promising candidates for their application in automotive, electronics and aerospace applications. For their successful application, one of the performance parameters that needs to be evaluated is their creep behavior at elevated temperatures. Hence this paper evaluates the high temperature creep behavior of wrought ZM21 magnesium alloy by impression test The tests were performed under constant temperature and stress. A flat ended cylindrical punch was used to create impressions. The temperature was varied between 398 K and 598 K while the stresses were varied from 200 MPa to 500 MPa (normalized stress: 0.014 ≤ σimp/ G ≥ 0.032). A power-law creep deformation was assumed to calculate creep exponent and activation energy using the steady state minimum impression velocity obtained from impression tests. The creep behavior was analyzed with the help of impression creep curves and plastic deformation was analyzed with the help of micrographs. It was found that creep exponent varied between 4.5 and 6 and activation energy between 73.28 and 113.35 kJ/mol were obtained. From the study it was concluded that the creep mechanism involved was pipe-diffusion-controlled dislocation climb.

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Impression creep behavior of the extruded Mg–4Zn–0.5Ca and Mg–4Zn–0.5Ca–2RE alloys

Cited by 20 publications

References 44 publications

Deformation Mechanism of Mg-4Sn-1.5Pb Alloy

Deformation Mechanism of Mg-4Sn-1.5Pb Alloy

Contributions of different strengthening mechanisms to the shear strength of an extruded Mg–4Zn–0.5Ca alloy

High temperature impression creep behavior and microstructures of wrought ZM21 magnesium alloy

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