Study on Porous Mg-Zn-Zr ZK61 Alloys Produced by Laser Additive Manufacturing

Zhang, Min; Chen, Changjun; Liu, Chang; Wang, Shunquan

doi:10.3390/met8080635

Cited by 24 publications

(11 citation statements)

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“…But they did not study the effect of laser power on the internal pores of the samples. Zhang et al (2018) studied the effect of laser power and Zn content on porous Mg-Zn-Zr alloys. They found that excessive laser energy would make the surface morphology worse.…”

Section: Introductionmentioning

confidence: 99%

Effect of laser power on formability, microstructure and mechanical properties of selective laser melted Mg-Al-Zn alloy

Wang

Chen

Zhang

2020

RPJ

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Purpose This paper aims to study the effect of laser energy on the formability, microstructure and mechanical properties of AZ61D alloy to assist systematic study of laser additive manufacturing of magnesium alloys. Design/methodology/approach In this study, porous magnesium alloy samples were prepared by using different laser parameters. The changes of the formability and microstructure were observed by SEM, and the mechanical properties were tested. The above results were analyzed to obtain optimized laser parameters. Findings When the laser power is between 85 and 95 W (pulse width 3.0 ms, frequency 40 Hz), the surface morphology of the selective laser-melted (SLMed) porous samples are smooth and even. At 80 W, SLMed porous samples have a maximum relative density of 99.2 per cent. Because of the “solute capture” effect and the evaporization of magnesium, the fraction of ß-Mg17Al12 increases from 42.1 to 52.1 per cent when power rises from 80 to 105 W. The ultimate compressive strength of SLMed porous magnesium alloys is strengthened with the increase of laser power. Originality/value The effect of laser parameters on microstructure and mechanical properties of porous magnesium alloys prepared by SLM has not been reported.

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Section: Introductionmentioning

confidence: 99%

Effect of laser power on formability, microstructure and mechanical properties of selective laser melted Mg-Al-Zn alloy

Wang

Chen

Zhang

2020

RPJ

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“…Based on the solid solution strengthening theory of Mg alloys, the lattice distortion caused by the solid solution of Zn limits the dislocation movement between the grains and boundaries (Shuai et al, 2017;Zhang et al, 2018). Zirconium is used as the most common grain refiner in Mg alloys that not contain Al, Mn, Si, Fe, Sn, Ni, Co and Sb (Ali et al, 2015).…”

Section: Discussionmentioning

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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“…AZ91 [26] 104-167 1-1.2 WE43 [25] 238 1 ZK60 [30] 420-750 2-8 ZK30-xAl [31] 4004 Al(wt.%): 0-7 21.6 ± 2.6-7.3 ± 1.0 ZK61-xZn [42] 1146 Zn(wt.%): 5-30 1.1-6.1 Mg-9Al [32] 94-250 10-20 Mg [37] 60-120 5-20 Mg-2Ca [38] 1200 5 Mg-xSn [39] 107 Sn(wt.%): 0-7 5-25 Mg-3Zn-xDy [40] 360 Dy(wt.%): 0-5 6.4-18.1 AZ61 [41] 138-208 1.6-2.5 Mg-Gd-Zn-Zr [44] 27-267 1.3 ± 0.4-2.3 ± 1.0 Second, because of the "solute capture" effect caused by rapid solidification, the solid solution of the elements in the matrix was enhanced, so the microhardness increased. Al and Zn, as common alloying elements, were solid-solved into the magnesium alloy matrix.…”

Section: Alloymentioning

confidence: 99%

A Review of SLMed Magnesium Alloys: Processing, Properties, Alloying Elements and Postprocessing

Liu

Guo

2020

Metals

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Selective laser melting (SLM) is an additive manufacturing method with rapid solidification properties, which is conducive to the preparation of alloys with fine microstructures and uniform chemical compositions. Magnesium alloys are lightweight materials that are widely used in the aerospace, biomedical and other fields due to their low density, high specific strength, and good biocompatibility. However, the poor laser formability of magnesium alloy restricts its application. This paper discusses the current research status both related to the theoretical understanding and technology applications. There are problems such as limited processable materials, immature process conditions and metallurgical defects on SLM processing magnesium alloys. Some efforts have been made to solve the above problems, such as adding alloy elements and applying postprocessing. However, the breakthroughs in these two areas are rarely reviewed. Due to the paucity of publications on postprocessing and alloy design of SLMed magnesium alloy powders, we review the current state of research and progress. Moreover, traditional preparation techniques of magnesium alloys are evaluated and related to the SLM process with a view to gaining useful insights, especially with respect to the postprocessing and alloy design of magnesium alloys. The paper also reviews the influence of process parameters on formability, densification and mechanical behavior of magnesium. In addition, the progress of microstructure and metallurgical defects encountered in the SLM processed parts is described. Finally, this article summarizes the research results, and with respect to materials and metallurgy, the new challenges and prospects in the SLM processing of magnesium alloy powders are proposed with respect to alloy design, base material purification, inclusion control and theoretical calculation, and the role of intermetallic compounds.

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Study on Porous Mg-Zn-Zr ZK61 Alloys Produced by Laser Additive Manufacturing

Cited by 24 publications

References 50 publications

Effect of laser power on formability, microstructure and mechanical properties of selective laser melted Mg-Al-Zn alloy

Effect of laser power on formability, microstructure and mechanical properties of selective laser melted Mg-Al-Zn alloy

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

A Review of SLMed Magnesium Alloys: Processing, Properties, Alloying Elements and Postprocessing

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