Microstructure and mechanical properties of Mg–Zn–Y rolled sheet with a Mg12ZnY phase

貴臣, 糸井; 武, 鈴木; 能人, 河村; 光治, 広橋

doi:10.2464/jilm.59.444

“…In Figure 3 , structural aspects of the samples present different orientations of the grains in the case of pure Zn and a dendritic structure of ZnMg alloy. Microstructural investigations of ZnMg alloy in cast state present α-Zn grains ( Figure 3 b) and a eutectic (consisting of α–Zn and intermetallic Mg 2 Zn 11 phase) located along the grain boundaries [ 31 ]. All samples present good structural homogeneity, no high quantities of inclusions on the grain boundaries.…”

Section: Resultsmentioning

confidence: 99%

New Zn3Mg-xY Alloys: Characteristics, Microstructural Evolution and Corrosion Behavior

Panaghie

¹

,

Cimpoeșu

²

,

Istrate

³

et al. 2021

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Zinc biodegradable alloys attracted an increased interest in the last few years in the medical field among Mg and Fe-based materials. Knowing that the Mg element has a strengthening influence on Zn alloys, we analyze the effect of the third element, namely, Y with expected results in mechanical properties improvement. Ternary ZnMgY samples were obtained through induction melting in Argon atmosphere from high purity (Zn, Mg, and Y) materials and MgY (70/30 wt%) master alloys with different percentages of Y and keeping the same percentage of Mg (3 wt%). The corrosion resistance and microhardness of ZnMgY alloys were compared with those of pure Zn and ZnMg binary alloy. Materials were characterized using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), linear and cyclic potentiometry, and immersion tests. All samples present generalized corrosion after immersion and electro-corrosion experiments in Dulbecco solution. The experimental results show an increase in microhardness and indentation Young Modulus following the addition of Y. The formation of YZn12 intermetallic phase elements with a more noble potential than pure Zinc is established. A correlation is obtained between the appearance of new Y phases and aggressive galvanic corrosion.

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“…Later, LPSO-containing Mg alloys with superior mechanical properties have been reported to be available by conventional thermo-mechanical processing such as extrusion, rolling, etc. [140,[149][150][151][152][153]. Most notably, the formation of LPSO structure in Mg alloys was found to maintain the YS and UTS at 200ºC being essentially the same level at room temperature [154,155], which was exceptional in Mg alloys consisting of any other kinds of precipitates.…”

Section: Tensile Properties Of Mg-zn-y Alloysmentioning

confidence: 86%

“…The novel phase with LPSO structure consists of structural blocks with close-packed atomic planes, forming various polytypes with different numbers of the close-packed atomic planes with different stacking of structural blocks [47,48,[134][135][136][137][138][139]. The phase is not only composed of a simple polymorphic structure with periodically intruded layered defects; it is composed of solute elements that are enriched in two atom layers adjacent to the layered defect, resulting in a chemically ordered structure as well [140]. In the absence of the in-plane long-range ordering of the constituent atoms, polytypes expressed as 10H, 14H, 18R and 24R (according to the Ramsdell notation) form among which 14H and 18R polytypes are the most dominantly observed ones…”

Section: Structural Investigations By Temmentioning

confidence: 99%

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Influence of Yttrium Addition on Texture and Deformation Behavior in an Extruded ZM31 Alloy

Tahreen¹

2021

Preprint

0

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The current “storm” of lightweighting, a revolution in materials, processes, and business models, which is brewing on the horizon of the auto industry, inspires researchers and engineers to develop and apply new wrought magnesium alloys with improved properties. For wider applications in the automotive and aerospace industries, the enhancement of strength, thermal stability and formability of magnesium alloys is required. In recent years, Mg-Zn-Y series alloys have received a considerable attention from the research community due to their improved mechanical properties. The present study was aimed at evaluating the influence of Y addition to Mg-Zn-Mn system based on phase formation, mechanical response and texture development with special attention paid to recrystallization, hot characterization and relative activity. The dissertation evaluated the strain hardening and deformation behavior of as-extruded Mg-ZnMn (ZM31) magnesium alloy with varying Y contents via compression testing at room temperature, 200°C and 300°C. Alloy ZM31+0.3Y consisted I-phase (Mg3YZn6); alloy ZM31+3.2Y contained I-phase and W-phase (Mg3Y2Zn3); alloy ZM31+6Y had long-period stacking-ordered (LPSO) X-phase (Mg12YZn) and Mg24Y5 particles. With increasing Y content the basal texture became weakened significantly. While alloys ZM31+0.3Y and ZM31+3.2Y exhibited a skewed true stress-true stain curve with a three-stage strain hardening feature caused by the occurrence of {10 Ī 2} extension twinning, the true stress-true strain curve of alloy ZM31+6Y was normal due to the dislocation slip during compression. The evolution of flow stress, texture and microstructure during the compression tests has been studied under various conditions of temperature and strain rates. Optical metallography, EBSD techniques and X-ray diffraction were employed to study the microstructural development and texture evolution. The deformation activation energy was calculated and the processing maps were generated to determine the optimum hot working parameters. In addition, viscoplastic selfconsistent model was successfully used to predict the experimental textures. Lastly, the strengthening mechanisms in each Mg-Zn-Mn-Y material are established quantitatively for the first time to account for grain refinement, thermal mismatch, dislocation density, load bearing, and particle strengthening contributions. The present work laid the foundations for a better understanding the role of Y elements on deformation behavior in magnesium alloys.

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“…The novel phase with LPSO structure consists of structural blocks with close-packed atomic planes, forming various polytypes with different numbers of the close-packed atomic planes with different stacking of structural blocks [47,48,[134][135][136][137][138][139]. The phase is not only composed of a simple polymorphic structure with periodically intruded layered defects; it is composed of solute elements that are enriched in two atom layers adjacent to the layered defect, resulting in a chemically ordered structure as well [140]. In the absence of the in-plane long-range ordering of the constituent atoms, polytypes expressed as 10H, 14H, 18R and 24R (according to the Ramsdell notation) form among which 14H and 18R polytypes are the most dominantly observed ones…”

Section: Structural Investigations By Temmentioning

confidence: 99%

Influence of Yttrium Addition on Texture and Deformation Behavior in an Extruded ZM31 Alloy

Tahreen¹

2021

Preprint

0

View full text Add to dashboard Cite

The current “storm” of lightweighting, a revolution in materials, processes, and business models, which is brewing on the horizon of the auto industry, inspires researchers and engineers to develop and apply new wrought magnesium alloys with improved properties. For wider applications in the automotive and aerospace industries, the enhancement of strength, thermal stability and formability of magnesium alloys is required. In recent years, Mg-Zn-Y series alloys have received a considerable attention from the research community due to their improved mechanical properties. The present study was aimed at evaluating the influence of Y addition to Mg-Zn-Mn system based on phase formation, mechanical response and texture development with special attention paid to recrystallization, hot characterization and relative activity. The dissertation evaluated the strain hardening and deformation behavior of as-extruded Mg-ZnMn (ZM31) magnesium alloy with varying Y contents via compression testing at room temperature, 200°C and 300°C. Alloy ZM31+0.3Y consisted I-phase (Mg3YZn6); alloy ZM31+3.2Y contained I-phase and W-phase (Mg3Y2Zn3); alloy ZM31+6Y had long-period stacking-ordered (LPSO) X-phase (Mg12YZn) and Mg24Y5 particles. With increasing Y content the basal texture became weakened significantly. While alloys ZM31+0.3Y and ZM31+3.2Y exhibited a skewed true stress-true stain curve with a three-stage strain hardening feature caused by the occurrence of {10 Ī 2} extension twinning, the true stress-true strain curve of alloy ZM31+6Y was normal due to the dislocation slip during compression. The evolution of flow stress, texture and microstructure during the compression tests has been studied under various conditions of temperature and strain rates. Optical metallography, EBSD techniques and X-ray diffraction were employed to study the microstructural development and texture evolution. The deformation activation energy was calculated and the processing maps were generated to determine the optimum hot working parameters. In addition, viscoplastic selfconsistent model was successfully used to predict the experimental textures. Lastly, the strengthening mechanisms in each Mg-Zn-Mn-Y material are established quantitatively for the first time to account for grain refinement, thermal mismatch, dislocation density, load bearing, and particle strengthening contributions. The present work laid the foundations for a better understanding the role of Y elements on deformation behavior in magnesium alloys.

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Microstructure and mechanical properties of Mg–Zn–Y rolled sheet with a Mg12ZnY phase

Cited by 6 publications

References 13 publications

New Zn3Mg-xY Alloys: Characteristics, Microstructural Evolution and Corrosion Behavior

New Zn3Mg-xY Alloys: Characteristics, Microstructural Evolution and Corrosion Behavior

Influence of Yttrium Addition on Texture and Deformation Behavior in an Extruded ZM31 Alloy

Influence of Yttrium Addition on Texture and Deformation Behavior in an Extruded ZM31 Alloy

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