Compressive deformation behavior of Mg–Zn–Ca alloy at elevated temperature

Tong, L.B.; Zheng, M.Y.; Zhang, D.P.; Gan, Weimin; Brokmeier, Heinz Günter; Meng, Jian; Zhang, H.J.

doi:10.1016/j.msea.2013.08.024

Cited by 8 publications

(5 citation statements)

References 32 publications

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“…Compared to MZC, m values of MZCM are higher at the same deformation temperature, indicating higher elongation of MZCM than of MZC. This is attributed to the higher grain boundary density in MZCM (Figure 1a,b), which benefits the plasticity of MZCM by grain boundary sliding [42]. Furthermore, the higher grain boundary density of MZCM accelerates the annihilation of positive and negative dislocations at grain boundaries in it, resulting in enhancement of elongation.…”

Section: Deformation Mechanismmentioning

confidence: 97%

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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Section: Deformation Mechanismmentioning

confidence: 97%

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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“…However, systematic research on the hot deformation behavior of fine-grained Mg-Zn-(Al)-Ca alloy is rarely reported. In a study by Tong et al [18] about the compressive deformation behavior of the as-extruded and as-ECAPed Mg–5.3Zn–0.6Ca (wt%) alloys at 200 °C to 300 °C, the compression behaviors of both conditions were mainly dominated by climb-controlled dislocation creep through grain boundary diffusion. The as-ECAPed alloy presented a lower activation energy (100–108 kJ/mol instead of 160–172 kJ/mol for as-extruded alloy), which might be derived from non-equilibrium grain boundaries [18].…”

Section: Introductionmentioning

confidence: 99%

“…In a study by Tong et al [18] about the compressive deformation behavior of the as-extruded and as-ECAPed Mg–5.3Zn–0.6Ca (wt%) alloys at 200 °C to 300 °C, the compression behaviors of both conditions were mainly dominated by climb-controlled dislocation creep through grain boundary diffusion. The as-ECAPed alloy presented a lower activation energy (100–108 kJ/mol instead of 160–172 kJ/mol for as-extruded alloy), which might be derived from non-equilibrium grain boundaries [18]. Kulyasova et al [19] investigated the application of high-pressure torsion (HPT), which leads to the formation of ultrafine-grained structures in Mg-Zn-Ca with an average grain size of 150 nm.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Hot Deformation Behavior of Twin Roll Cast Mg-2Zn-1Al-0.3Ca Alloy

et al. 2019

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In the present work, the microstructure, texture, mechanical properties as well as hot deformation behavior of a Mg-2Zn-1Al-0.3Ca sheet manufactured by twin roll casting were investigated. The twin roll cast state reveals a dendritic microstructure with intermetallic compounds predominantly located in the interdendritic areas. The twin roll cast samples were annealed at 420 °C for 2 h followed by plane strain compression tests in order to study the hardening and softening behavior. Annealing treatment leads to the formation of a grain structure, consisting of equiaxed grains with an average diameter of approximately 19 µm. The twin roll cast state reveals a typical basal texture and the annealed state shows a weakened texture, by spreading basal poles along the transverse direction. The twin roll cast Mg-2Zn-1Al-0.3Ca alloy offers a good ultimate tensile strength of 240 MPa. The course of the flow curves indicate that dynamic recrystallization occurs during hot deformation. For the validity range from 250 °C to 450 °C as well as equivalent logarithmic strain rates from 0.01 s−1 to 10 s−1 calculated model coefficients are shown. The average activation energy for plastic flow of the twin roll cast and annealed Mg-2Zn-1Al-0.3Ca alloy amounts to 180.5 kJ/mol. The processing map reveals one domain with flow instability at temperatures above 370 °C and strain rates ranging from 3 s−1 to 10 s−1. Under these forming conditions, intergranular cracks arose and grew along the grain boundaries.

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“…High volume percentage of recrystallized grains was obtained in Mg-5.25Zn-0.6Ca alloy that was indirectly extruded at 300 • C using large extrusion ratios [13]. Mg-Zn-Ca alloys were also formed by equal-channel angular pressing (ECAP) and the resulting changes in the texture, microstructure, and other properties have been studied [14]. The higher temperature strength is lower in ECAP material compared with extruded alloy due to grain boundary sliding and grain boundary diffusion.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Strength and Hot Working Technology for As-Cast Mg–1Zn–1Ca (ZX11) Alloy

Rao

Suresh

Prasad³

et al. 2017

Metals

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Cast Mg-1Zn-1Ca alloy (ZX11) has been tested to evaluate its compressive strength between 25 • C and 250 • C, and workability in the range of 260-500 • C. The ultimate compressive strength of this alloy is about 30% higher than that of creep-resistant alloy Mg-3Sn-2Ca (TX32) between 25 • C and 200 • C, and exhibits a plateau between 100 • C and 175 • C, similar to TX32. This is attributed to Mg 2 Ca particles present at grain boundaries that reduce their sliding. The processing map, developed between 260 and 420 • C in the strain rate limits of 0.0003 s −1 to 1 s −1 , exhibited two domains in the ranges: (1) 280-330 • C and 0.0003-0.01 s −1 and (2) 330-400 • C and 0.0003-0.1 s −1 . In these domains, dynamic recrystallization occurs, with basal slip dominating in the first domain and prismatic slip in the second, while the recovery mechanism being climb of edge dislocations in both. The activation energy estimated using standard kinetic rate equation is 191 kJ/mol, which is higher than the value for lattice self-diffusion in magnesium indicating that a large back stress is created by the presence of Ca 2 Mg 6 Zn 3 intermetallic particles in the matrix. It is recommended that the alloy be best processed at 380 • C and 0.1 s −1 at which prismatic slip is favored due to Zn addition. At higher strain rates, the alloy exhibits flow instability and adiabatic shear band formation at <340 • C while flow localization and cracking at grain boundaries occurs at temperatures >400 • C.

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Compressive deformation behavior of Mg–Zn–Ca alloy at elevated temperature

Cited by 8 publications

References 32 publications

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

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

Microstructure and Hot Deformation Behavior of Twin Roll Cast Mg-2Zn-1Al-0.3Ca Alloy

High Temperature Strength and Hot Working Technology for As-Cast Mg–1Zn–1Ca (ZX11) Alloy

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