Effect of aging treatment on the microstructure, creep resistance and high-temperature mechanical properties of Mg–6Zn–3Cu alloy with La- and Ce-rich rare earth additions

Golmakaniyoon, Sahar; Mahmudi, R.

doi:10.1016/j.msea.2014.09.113

Cited by 14 publications

(5 citation statements)

References 30 publications

(37 reference statements)

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“…It should be noted that at low aging temperatures (about 70 8C), very fine Guinier-Preston zones which are hardly detectable by transmission electron microscopy (TEM) and have low effect on hardness enhancement start to form. At higher temperatures and longer aging time, the size and number of Guinier-Preston zones are increased and nano-scaled precipitates start to form resulting in the peak hardness [28,29].…”

Section: Aging Behaviourmentioning

confidence: 99%

“…This is because the precipitation during the aging process considerably decreases the solute atoms, therefore, no Guinier-Preston zone is formed in heating of the aged sample in differential scanning calorimetry tests, but during the heating of solid solution samples the Guinier-Preston zones are formed and by extending the aging process, nanoscaled precipitates and Guinier-Preston zones transform to large incoherent precipitates which leads to the reduction in hardness of the specimen. The formation of Guinier-Preston zones and enhancement in mechanical properties during aging of Mg-Zn-Ca alloy has been studied by [28]. They attributed the formation of Guinier-Preston zones to the presence of zinc and calcium elements in the alloy.…”

Section: Aging Behaviourmentioning

confidence: 99%

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Influence of heat treatment and aging on microstructure and mechanical properties of Mg‐1.8Zn‐0.7Si‐0.4Ca alloy

Shaeri

Taheri

2019

Materialwissenschaft Werkst

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In order to optimize the aging treatment of Mg‐1.8Zn‐0.7Si‐0.4Ca alloy, different times and temperatures of solid solution and age hardening were applied to the alloy specimens. Microstructures and mechanical properties of the specimens were investigated using the optical microscopy, field emission scanning electron microscopy equipped with an energy dispersive x‐ray spectrometer, x‐ray diffraction, hardness, and shear punch tests. The lowest hardness and strength were achieved by solution treating of the alloy at 500 °C for 8 h, presenting the optimal condition for solution treatment of the alloy. The microstructural examinations revealed three different precipitates consisting of CaMgSi, Ca2Mg6Zn3, and Mg2Si in the solid solution specimens. It was found that the highest peak hardness and strength are obtained by aging the alloy at 150 °C for 16 h. This condition was confirmed by differential scanning calorimetry (DSC) tests performed on the solid solution and aged specimens.

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Section: Aging Behaviourmentioning

confidence: 99%

Section: Aging Behaviourmentioning

confidence: 99%

Influence of heat treatment and aging on microstructure and mechanical properties of Mg‐1.8Zn‐0.7Si‐0.4Ca alloy

Shaeri

Taheri

2019

Materialwissenschaft Werkst

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“…Besides this strengthening, the ternary compounds promoted dynamic recrystallization by particle-stimulated nucleation (PSN), which led to a reduction in grain sizes and the weakening of the basal fiber texture. La has similar physical and chemical characteristics to those of Ce, with low solid solubility and the easy formation of stable phases in Mg alloys [17]. However, La in Mg alloys has a stronger strengthening effect compared with Ce [18].…”

Section: Introductionmentioning

confidence: 99%

Enhancing mechanical properties of Mg-Gd-Y-Zn alloys via microalloying with Ce and La

Zhang¹,

Kim²,

Liao³

et al. 2022

Korean J. Met. Mater.

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This study investigated the microstructure and mechanical properties of Mg-1Gd-1Y-1Zn (at.%) alloys containing designed amounts of Ce or La. The Mg5(Gd,Zn) phase formed in the as-cast Mg-Gd-Y-Zn-Ce/La alloys and disappeared after a homogenization treatment at 500°C for 24 h. The addition of Ce and La resulted in the formation of Ce(Mg,Zn)12 and La(Mg,Zn)12 phases, respectively. Except for that, the Ce or La addition had no significant effect on the morphology, volume fraction, and type of the long-period stacking ordered (LPSO) phases in the Mg-Gd-Y-Zn alloy. The grain size decreased with increasing microalloying content because the heavy Ce and La atoms impeded atomic migration across the boundaries. The solute drag effect led to the formation of the rare earth texture in the extruded Mg-Gd-Y-Zn-Ce/La alloys, whose extent decreased with increasing microalloying content. The mechanical strength was improved by the addition of Ce or La at the sacrifice of ductility. In particular, La exhibited a stronger reinforcement ability than Ce when it was added to the Mg-Gd-Y-Zn alloys. Among the investigated chemical compositions, the Mg-1Gd-1Y-1Zn-0.3La alloy exhibited the highest strength because it had the finest grains, the highest volume fraction of the second phase, and the weakest texture intensity. Furthermore, the alloys showed an unusual yield asymmetry due to the difference in the deformation mode of the LPSO phase.

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“…Due to the limitations that the poor high-temperature performance of Mg alloys imposes on potential applications, the development of new heat-resistant Mg alloys with excellent mechanical properties has attracted considerable attention. For the formation of heat-resistant RE-containing phases (RE, rare earth), the addition of RE elements such as Nd, Ce, and La is a promising way to improve the high-temperature mechanical properties of Mg-Zn alloys in particular [7][8][9][10]. As one of the more cost-effective RE elements, yttrium (Y) has been widely used in Mg-Zn alloys [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and High Temperature Tensile Properties of As-Aged Mg-6Zn-1Mn-4Sn-(01, 0.5 and 1.0) Y Alloys

Zhong

Guo

2018

Metals

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The microstructures and high-temperature tensile properties of as-aged Mg-6Zn-1Mn-4Sn-(0.1, 0.5 and 1.0) Y (wt.%, ZMT614-Y) alloys were investigated by optical microscopy (OM), X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-temperature tensile tests. The tensile temperatures were 150 °C, 200 °C, 250 °C and 300 °C, respectively. The results showed that the phase compositions of as-aged alloys were α-Mg, α-Mn, MgZn2, Mg2Sn, and MgSnY phases. The Mg2Sn and MgSnY high-temperature phases inhibited grain growth in the heat treatment and tensile processes. The as-aged ZMT614-0.5Y alloy has the best high-temperature mechanical properties, with yield strength (YS), ultimate tensile strength (UTS), and elongation values of 277 MPa, 305 MPa, and 16.7%, respectively, at 150 °C. As the tensile temperature increased to 300 °C, the YS and UTS decreased to 136 MPa and 150 MPa, and elongation increased to 25.5%. The fracture mechanism changed as the tensile temperatures ranged from 150 °C to 300 °C, from the transgranular fracture type at temperatures of 150 °C and 200 °C, to the transgranular and intergranular mixed-mode fracture type when tensile temperatures increased to 250 °C, to an intergranular fracture mechanism at 300 °C.

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Effect of aging treatment on the microstructure, creep resistance and high-temperature mechanical properties of Mg–6Zn–3Cu alloy with La- and Ce-rich rare earth additions

Cited by 14 publications

References 30 publications

Influence of heat treatment and aging on microstructure and mechanical properties of Mg‐1.8Zn‐0.7Si‐0.4Ca alloy

Influence of heat treatment and aging on microstructure and mechanical properties of Mg‐1.8Zn‐0.7Si‐0.4Ca alloy

Enhancing mechanical properties of Mg-Gd-Y-Zn alloys via microalloying with Ce and La

Microstructures and High Temperature Tensile Properties of As-Aged Mg-6Zn-1Mn-4Sn-(01, 0.5 and 1.0) Y Alloys

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