Effects of Sn addition on microstructure and mechanical properties of Mg–Zn–Al alloys

Chen, Jihua; Chen, Zhenhua; Yan, Hongge; Zhang, Fuquan; Kun, Liao

doi:10.1016/j.jallcom.2007.07.066

Cited by 87 publications

(37 citation statements)

References 9 publications

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“…However, the excessively coarse Mg 2 Sn precipitates have a segregation tendency at grain boundaries and serve as the crack origins, which cause the decrease of the UTS and the plasticity. Therefore, the tensile strength and the plasticity decrease with the further increase in the Sn content [19]. Trace Ca addition refines grains, modifies the morphology of the divorced eutectics and suppresses the segregation and the growth of Mg 2 Sn precipitates, leading to higher tensile strength and larger elongation.…”

Section: Discussionmentioning

confidence: 99%

“…The ZASn6230 alloy had less and finer MgZn divorced eutectics than the ZA62 alloy, indicating that the addition of Sn suppressed the divorced eutectic transformation and refined the MgZn divorced eutectics. With the increment of Sn, great deals of short rod-like Mg 2 Sn precipitates were scattered in the Mg solid solution, and a coarsening tendency was observed [19]. The SEM images of the ZA62 alloys with the addition of Sn and Ca are shown in Fig.…”

Section: Structurementioning

confidence: 98%

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Effects of Sn and Ca additions on microstructure, mechanical properties, and corrosion resistance of the as‐cast Mg‐Zn‐Al‐based alloy

Chen

Yan

et al. 2008

Materials & Corrosion

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Effects of Sn and Ca additions on microstructure, mechanical properties, and corrosion resistance of the as-cast Mg-6Zn-2Al-based alloy were investigated by SEM, XRD, tensile tests, electrochemical measurements, etc. The higher the Sn content, the higher the yield strength of the Mg-6Zn-2Al-based alloy. Trace Ca addition refined both grains and divorced eutectics in the Mg-Zn-Sn-Al alloys, leading to the best combination of strength and plasticity. Moreover, its influence was more significant for the alloy with a higher Sn content. Furthermore, the combined addition had a beneficial effect on the corrosion resistance improvement of the Mg-6Zn-2Al alloy. The Mg-6Zn-2Al-3Sn-0.2Ca alloy was the most corrosion-resistant alloy among the nine alloys studied, better than AZ91 and ZA85. It could be ascribed to the decrease and the refinement of divorced eutectics, the higher hydrogen overvoltage of Sn and the Ca grain refinement.

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Section: Discussionmentioning

confidence: 99%

Section: Structurementioning

confidence: 98%

Effects of Sn and Ca additions on microstructure, mechanical properties, and corrosion resistance of the as‐cast Mg‐Zn‐Al‐based alloy

Chen

Yan

et al. 2008

Materials & Corrosion

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“…Therefore, controlling the morphology and nucleation sites of the secondary phase particles is critical to improving the performance of the Mg8Sn based alloys. Table 3 summaries the reported tensile properties of as-cast Mg-Al [26][27][28] , Mg-Zn [6,[29][30] and Mg-Sn [9,31] …”

Section: Tensile Propertiesmentioning

confidence: 99%

Improved tensile properties of Mg-8Sn-1Zn alloy induced by minor Ti addition

et al. 2016

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Owing to their good mechanical properties at room temperature, conventional Mg-Al and Mg-Zn based alloys have attracted great interest. Unfortunately, they have problems associated with lower creep and corrosion resistance, and cannot meet the requirements of key structural components due to the low thermal stability of the main secondary phase at elevated temperatures (>150 °C) [1][2] . Therefore, it is imperative to develop novel Mg alloys with excellent performance at high temperatures.Mg-Sn based alloys have received considerable attention as potential candidates for high performance casting and wrought magnesium alloys with enhanced thermal stability owing to the presence of high melting temperature (T m ≈ 770 °C) Mg 2 Sn particles in the microstructure [3][4] . However, the coarse Mg 2 Sn phase and the dendritic structure are often present in ascast binary Mg-Sn alloys, hindering their industrial application [5] . Consequently, the modification of the Abstract:In this study, the influence of minor titanium (Ti) addition on the microstructure and tensile properties of Mg-8Sn-1Zn based alloys were investigated by means of optical microscopy, X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry, and tensile tests. The results showed that Ti can decrease the secondary dendrite arm spacing (SDAS). The tensile strength of the Mg-8Sn-1Zn-Ti alloys is initially increased by increasing the Ti content up to 0.09wt.%, but subsequently decreased for further increase of Ti content. The improved tensile properties are attributed to the decreased SDAS and refined Mg 2 Sn phases, as well as the increased fraction of tin (Sn) segregated regions. The tensile fracture surface of the studied alloys shows mixed characteristics of cleavage and quasi-cleavage fracture. Adding Ti does not significantly change the fracture mode of the studied alloys.Key words: Mg-8Sn-1Zn alloy; tensile properties; titanium; tin segregation Micro-alloying can ideally help achieve this goal. The element Ti has been widely used owing to its effectiveness in grain refinement of not only Al-based and Mg-Al alloys, but also of Al-free Mg alloys [6] . Choi et al. [7] reported that a proper control of trace amounts of Ti below the solubility limit has the potential to improve the corrosion resistance of cast Mg-Al alloys by decreasing the grain size and the volume fraction, as well as the size of lamellar (α+β) structures and the divorced eutectic β-phase, with the morphology being transformed from a continuous network structure to a semi-continuous one. Similarly, a study by Candan et al. [8] on AZ91 alloys containing 0.2-0.5wt.% Ti indicated that an improvement in tensile strength can be achieved by introducing Ti to modify the microstructure and refine the grain size. However, until now, only Yang et al. [9] have investigated the effects of minor Ti additions on the ascast microstructure and mechanical properties of Mg-Sn based alloys. The results showed that the addition of 0.1-0.3 wt.% Ti to the Mg-3Sn-2Sr alloy can simulta...

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“…Therefore, Mg-Zn-Al (ZA) is a promising alloy system able to meet the above requirements [1]. Our previous results have shown that Mg-6Zn-2Al (ZA62) alloy has a good balance between strength and plasticity and high microstructural stability [10]. Since rare earth elements are very expensive and difficult to be alloyed homogeneously, the alkaline earth elements such as Ca, Sr and the semi-metals such as Si and Sn are considered for the micro-structural modification of the Mg-Zn alloy system.…”

Section: Creep-resistant Magnesium Alloy Design and Developmentmentioning

confidence: 99%

A review: Hot topics on magnesium technology in China

Chen

2008

Front. Mater. Sci. China

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Magnesium alloys have wide applications in automobiles, aerospace and so on due to many advantages, while a number of undesirable properties including poor corrosion resistance, inferior creep resistance and bad plastic processing ability have hindered their applications. Creep-resistant magnesium alloy design, plastic processing of magnesium alloys and rapid solidification processing of magnesium alloys have become the hot topics in magnesium technology. Other than these, surface modification as well as laser beam welding are also involved. The research progress and development in magnesium technology in China are reviewed in the paper.

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Effects of Sn addition on microstructure and mechanical properties of Mg–Zn–Al alloys

Cited by 87 publications

References 9 publications

Effects of Sn and Ca additions on microstructure, mechanical properties, and corrosion resistance of the as‐cast Mg‐Zn‐Al‐based alloy

Effects of Sn and Ca additions on microstructure, mechanical properties, and corrosion resistance of the as‐cast Mg‐Zn‐Al‐based alloy

Improved tensile properties of Mg-8Sn-1Zn alloy induced by minor Ti addition

A review: Hot topics on magnesium technology in China

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