Effect of Zn addition on the microstructure and mechanical properties of cast, rolled and extruded Mg-6Sn-xZn alloys

Mahallawy, Nahed El; Diaa, A. Ahmed; Akdesir, M.; Palkowski, Heinz

doi:10.1016/j.msea.2016.10.075

Cited by 48 publications

(13 citation statements)

References 13 publications

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“…According to the Mg-Sn binary equilibrium phase diagram, the eutectic reaction occurred at 561.2 °C and Mg 2 Sn phase forms. The addition of the Zn element did not lead to the formation of any new phases, which is in accordance with the previous report by Mahallawya et al [ 18 ]. While Zn addition increases, the secondary phase composition becomes sensitive to the ratio of Zn/Sn.…”

Section: Discussionsupporting

confidence: 93%

Effect of Zn and Ca Addition on Microstructure and Strength at Room Temperature of As-Cast and As-Extruded Mg-Sn Alloys

et al. 2018

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In this study, the effect of Zn and Ca addition on microstructure and strength at room temperature of Mg-Sn alloys was investigated by comparison of Mg-6Sn, Mg-6Sn-2Zn, and Mg-6Sn-2Zn-1Ca alloys in as-cast and as-extruded states. In the as-cast samples, α-Mg and Mg2Sn phases were the main phases of Mg-6Sn and Mg-6Sn-2Zn alloys, while the CaMgSn phase was formed in Mg-6Sn-2Zn-1Ca alloy due to the addition of the Ca element. Mg2Sn phase dissolved into the matrix during homogenization while CaMgSn phase remained. Incomplete dynamic recrystallization (DRX) took place in these alloys during hot extrusion. Fine Mg2Sn precipitates were observed in α-Mg matrix of as-extruded samples. Zn showed little influence on microstructure, whereas Ca reduced the volume fraction of un-DRXed grains and increased the size of DRXed grains. As-extruded Mg-Sn alloys exhibited typical fiber texture. The strength at room temperature of Mg-Sn alloys improved significantly after hot extrusion. The addition of Zn element was beneficial to the strength at room temperature of the Mg-6Sn alloy, while the further addition of Ca element was harmful to the strength. Among these alloys, the Mg-6Sn-2Zn alloy exhibited the best strength at room temperature in both as-cast and as-extruded states.

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Section: Discussionsupporting

confidence: 93%

Effect of Zn and Ca Addition on Microstructure and Strength at Room Temperature of As-Cast and As-Extruded Mg-Sn Alloys

et al. 2018

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“…Zinc is the second element that is used to alloy that affects the strength, castability, eutectic phase of grain boundary, corrosion resistance, and precipitation hardenability of some magnesium alloys (El Mahallawy et al, 2017;Decker et al, 2019). Zirconium is used in Mg alloys for grain refinement; it is currently the well-known element that has potent grain refining effects on the Mg-Zn alloys (Wang et al, 2014;Karakulak, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Zirconium is used in Mg alloys for grain refinement; it is currently the well-known element that has potent grain refining effects on the Mg-Zn alloys (Wang et al, 2014;Karakulak, 2019). The microstructural behaviour of Zr grain refinement is poorly understood, but is believed to be caused by the crystal structure modification, intermetallic phases and lattice parameter similarity of Mg and Zr (Buzolin et al, 2015;El Mahallawy et al, 2017;Karakulak, 2019). It has been reported that Zr provides a strong grain refining effect by providing nucleation in Mg alloys not alloyed with Al.…”

Section: Introductionmentioning

confidence: 99%

Análisis térmico y comportamiento de desgaste de aleaciones Mg-4Zn-(x)Zr fundidos en molde de cáscara y molde de grafito

Kumruoğlu

2021

revmetal

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El efecto de refinamiento del grano del circonio (Zr) es conocido, sin embargo, la influencia en la cantidad de Zr y su efecto sobre la solidificación y el comportamiento de desgaste de las aleaciones de Mg-Zn modificadas no se han estudiado adecuadamente. Las aleaciones de Mg-4Zn-(x)Zr son aleadas con la adición de 0,5% a 4% en peso de elemento Zr se funden y se vierten en dos moldes de colada diferentes y se realizan análisis térmicos. Se examinaron la microestructura de los productos de colada, el comportamiento de solidificación, las transformaciones de fase, el tamaño de grano, las curvas de análisis térmico y las propiedades de desgaste. La microestructura se modificó mediante la adición de Zr y el tamaño de grano se redujo tanto para los materiales de moldeo de grafito como de cerámica. La máxima resistencia a la tracción se obtuvo añadiendo 1% de Zr (170 MPa) y 4% Zr (105-110 HRB) utilizando un molde de grafito, respectivamente. La máxima resistencia a la tracción a temperatura ambiente se alcanzó en el Mg-4Zn-1Zr, el alargamiento fue del 4,9% y la resistencia a la tracción fue de 138 MPa. El valor máximo de tracción en caliente se obtuvo en las aleaciones con 2% de Zr añadido. La tasa de desgaste de la aleación Mg-4Zn disminuyó al aumentar el elemento Zr hasta un 2% en peso. La adición de más del 2% en peso de Zr provocó un aumento de la microporosidad en la microestructura. Debido a la microporosidad causada por la adición de Zr, la tasa de desgaste se redujo ligeramente.

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“…At present, the Mg-Zn-Sn alloys ingots are mainly produced by conventional steel and sand mold casting [ 16 , 17 , 18 , 19 ]. However, the conventional casting process has some disadvantages such as elements segregation and emergence of casting shrinkage cavities and porosity, leading to low strength or poor ductility.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of the As-Cast and As-Homogenized Mg-Zn-Sn-Mn-Ca Alloy Fabricated by Semicontinuous Casting

et al. 2018

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In this paper, a new type of low-cost Mg-3.36Zn-1.06Sn-0.33Mn-0.27Ca (wt %) alloy ingot with a diameter of 130 mm and a length of 4800 mm was fabricated by semicontinuous casting. The microstructure and mechanical properties at different areas of the ingot were investigated. The microstructure and mechanical properties of the alloy under different one-step and two-step homogenization conditions were studied. For the as-cast alloy, the average grain size and the second phase size decrease from the center to the surface of the ingot, while the area fraction of the second phase increases gradually. At one-half of the radius of the ingot, the alloy presents the optimum comprehensive mechanical properties along the axial direction, which is attributed to the combined effect of relatively small grain size, low second-phase fraction, and uniform microstructure. For the as-homogenized alloy, the optimum two-step homogenization process parameters were determined as 340 °C × 10 h + 520 °C × 16 h. After the optimum homogenization, the proper size and morphology of CaMgSn phase are conducive to improve the microstructure uniformity and the mechanical properties of the alloy. Besides, the yield strength of the alloy is reduced by 20.7% and the elongation is increased by 56.3%, which is more favorable for the subsequent hot deformation processing.

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Effect of Zn addition on the microstructure and mechanical properties of cast, rolled and extruded Mg-6Sn-xZn alloys

Cited by 48 publications

References 13 publications

Effect of Zn and Ca Addition on Microstructure and Strength at Room Temperature of As-Cast and As-Extruded Mg-Sn Alloys

Effect of Zn and Ca Addition on Microstructure and Strength at Room Temperature of As-Cast and As-Extruded Mg-Sn Alloys

Análisis térmico y comportamiento de desgaste de aleaciones Mg-4Zn-(x)Zr fundidos en molde de cáscara y molde de grafito

Microstructure and Mechanical Properties of the As-Cast and As-Homogenized Mg-Zn-Sn-Mn-Ca Alloy Fabricated by Semicontinuous Casting

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