Microstructural features of Mg-8%Sn alloy and its correlation with mechanical properties

Poddar, Palash; Kamaraj, Ashok; Murugesan, Arun; Bagui, Sumanta; Sahoo, K L

doi:10.1016/j.jma.2017.07.003

Cited by 24 publications

(6 citation statements)

References 15 publications

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“…For Py-II 〈c + a〉 slip system, our calculations reveal that the magnitudes of ∆γ are negative when the atomic radii of the alloying elements are close to or larger than that of Mg. These results are consistent with experimental findings that alloying Sn, Li, Pb, Ca, and RE can activate more 〈c + a〉 slip systems [30][31][32][33]. Therefore, based on the ∆γ values of Py-II 〈c + a〉, one can accurately predict the alloying effects on the plasticity of Mg.…”

supporting

confidence: 90%

Alloying effects on the plasticity of magnesium: comprehensive analysis of influences of all five slip systems

Ding¹,

Zhao²,

Sun³

et al. 2019

J. Phys.: Condens. Matter

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Magnesium (Mg) based alloys are of interest in a wide variety of industries including automotive, aerospace, and electronic industries, in part because they possess a high strength-toweight ratio while being environmentally benign [1,2]. However, many applications of Mg alloys have been hindered by their low strength and poor plasticity at room temperature [3][4][5]. The poor plasticity of Mg stems from its highly anisotropic critically resolved shear stress of different slip systems [6,7]. As evidenced by recent experiments, basal slip initially takes place at the onset of plastic deformation on suitably oriented grains, followed by the gradual activation of prism and pyramidal slip systems under larger stress [6,8]. As such, plastic deformation of Mg and its alloys should arise from the combined influence of all slip systems, which include the basal 〈a〉, prism 〈a〉, pyramidal I (Py-I) 〈a〉, Py-I 〈c + a〉, and pyramidal II (Py-II) 〈c + a〉. Despite numerous published studies focus on alloying effects on the activation of slip systems, limited attention has been paid to the alloying effects on the activation probability of slip systems of Mg alloys.In this study, we carried out density functional theory (DFT) calculations to systematically investigate alloying effects on stacking fault energies associated with slip system activation, and activation rate of basal 〈a〉, prism 〈a〉, Py-I 〈a〉, Py-I 〈c + a〉 and Py-II 〈c + a〉 slip systems. We find that alloying solutes with atomic radius larger than that of Mg can reduce the stacking fault energy and increase activation rate of Py-II 〈c + a〉 slip system, and ultimately improve the plasticity of Mg. These findings provide a physical understanding of the effects of alloying on the

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supporting

confidence: 90%

Alloying effects on the plasticity of magnesium: comprehensive analysis of influences of all five slip systems

Ding¹,

Zhao²,

Sun³

et al. 2019

J. Phys.: Condens. Matter

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“…However, the micrographs of the #2–#4 alloys reveal a typical α-Mg + β-Li duplex structure. Poddar et al claimed [22] that due to the strong solid solution strengthening of Sn, the solid solubility of Mg in the β-Li phase is decreased, which results in a delayed occurrence of the β-Li phase. In addition, with the increase of Al content, the β-Li phase and some second phases are gradually dissolved in the #2–#4 alloys.…”

Section: Resultsmentioning

confidence: 99%

“…A relevant study shows that the stability of compounds formed among alloying elements depends on the electronegativity difference and the chemical reaction activity [22]. Table 3 shows the electronegativities of the experimental elements.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and mechanical properties of Mg–6Li–xAl–0.8Sn alloys

Yang

Wang

et al. 2018

Materials Science and Technology

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As-cast and as-extruded Mg–6Li– xAl–0.8Sn ( x = 0, 1, 3 and 5 wt-%) alloys were prepared. The microstructure and mechanical properties were investigated and discussed. The experimental results show that the Mg–6Li–0.8Sn alloy is composed of three phases: α-Mg, Mg2Sn and Li2MgSn. With the addition of Al, the test alloys display typical α-Mg + β-Li duplex structures. The new Mg17Al12 and LiMgAl2 phases were found in the Mg–6Li–1Al–0.8Sn alloy. The lamellar-type AlLi phase was formed whereas the Mg17Al12 phase disappeared in Mg–6Li–3Al–0.8Sn alloy. The LiMgAl2 phase vanished in the Mg–6Li–5Al–0.8Sn alloy. The mechanical properties of as-extruded alloys were remarkably improved. The as-extruded Mg–6Li–3Al–0.8Sn alloy exhibited the best mechanical properties, with a yield strength, tensile strength and elongation of 209.8 MPa, 242.6 MPa and 15.5%, respectively.

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“…The chemical properties of Sn are stable [145]. Several studies have shown that the addition of Sn can improve the properties of Mg alloys and that the resulting alloy exhibits excellent mechanical properties and good corrosion resistance, especially when the Sn content is 1 wt.% [145,146]. Zhou et al [39] investigated the effect of adding different amounts of Sn on the microstructure and properties of SLMed Mg.…”

Section: Alloying Element: Snmentioning

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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Microstructural features of Mg-8%Sn alloy and its correlation with mechanical properties

Cited by 24 publications

References 15 publications

Alloying effects on the plasticity of magnesium: comprehensive analysis of influences of all five slip systems

Alloying effects on the plasticity of magnesium: comprehensive analysis of influences of all five slip systems

Microstructure and mechanical properties of Mg–6Li–xAl–0.8Sn alloys

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

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