Influence of alloying elements on microstructure and microhardness of Mg-Sn-Zn-based alloys

Cheng, Weili; Park, S.S.; Tang, Wei; You, Bong Sun; Koo, Bon Heun

doi:10.1016/s1003-6326(10)60636-x

Cited by 26 publications

(9 citation statements)

References 13 publications

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“…[9,10] . Furthermore, our previous work showed that, among the studied ternary alloys, the Mg-8Sn-1Zn alloy exhibits excellent mechanical properties [11] . Based on the above mentioned results, the morphology, size, and distribution of the eutectic phases and SDAS of Mg8Sn-1Zn based alloys are expected to be modified by minor Ti alloying in this study, resulting in a further improvement of the tensile properties of the Ti-containing alloys.…”

Section: Key Laboratory Of Interface Science and Engineering In Advanmentioning

confidence: 93%

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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Section: Key Laboratory Of Interface Science and Engineering In Advanmentioning

confidence: 93%

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

et al. 2016

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“…Based on the previous literature and phase diagrams [1,5,6,27], it is assumed that all the Al and Zn atoms were dissolved into matrix, so the C Al and C Zn in AZ31 is 2.6 at% and 0.37 at%, C Al and C Zn in TAZ811 is 0.96 at% and 0.39 at%, respectively. So the compensation strength caused by Al and Zn between AZ31 and TAZ811 alloys is about The respective contributions of the four strengthening mechanisms are summarized in Table 3.…”

Section: Strengthening Effect Due To Multiple Alloying Additions Of Amentioning

confidence: 99%

Strengthening mechanisms of indirect-extruded Mg–Sn based alloys at room temperature

Wei

Tian

et al. 2014

Journal of Magnesium and Alloys

102

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The strength of a material is dependent on how dislocations in its crystal lattice can be easily propagated. These dislocations create stress fields within the material depending on their intrinsic character. Generally, the following strengthening mechanisms are relevant in wrought magnesium materials tested at room temperature: fine-grain strengthening, precipitate strengthening and solid solution strengthening as well as texture strengthening. The indirect-extruded Mge8Sn (T8) and Mge8Sne1Ale1Zn (TAZ811) alloys present superior tensile properties compared to the commercial AZ31 alloy extruded in the same condition. The contributions to the strengthen of MgeSn based alloys made by four strengthening mechanisms were calculated quantitatively based on the microstructure characteristics, physical characteristics, thermomechanical analysis and interactions of alloying elements using AZ31 alloy as benchmark.

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“…High room-temperature tensile strength (YS: 308 MPa) can be obtained in extruded Mg–2.2Sn–0.5Zn–1.0Al (in at%) alloy due to the strengthening effect by the presence of Mg 2 Sn precipitates and by the solid-solution hardening effect of aluminum [76]. Further, the effect of Al and Mn addition on the aging behavior of Mg–Sn–Zn alloy has been examined [84]. As mentioned above, the high strength of previously reported Mg−Sn based wrought alloys is attributed to the presence of precipitates formed during the forming process or artificial aging treatment.…”

Section: Mg–zn–al Base Alloymentioning

confidence: 99%

Quasicrystal-reinforced Mg alloys

Kim

2014

Science and Technology of Advanced Materials

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The formation of the icosahedral phase (I-phase) as a secondary solidification phase in Mg–Zn–Y and Mg–Zn–Al base systems provides useful advantages in designing high performance wrought magnesium alloys. The strengthening in two-phase composites (I-phase + α-Mg) can be explained by dispersion hardening due to the presence of I-phase particles and by the strong bonding property at the I-phase/matrix interface. The presence of an additional secondary solidification phase can further enhance formability and mechanical properties. In Mg–Zn–Y alloys, the co-presence of I and Ca2Mg6Zn3 phases by addition of Ca can significantly enhance formability, while in Mg–Zn–Al alloys, the co-presence of the I-phase and Mg2Sn phase leads to the enhancement of mechanical properties. Dynamic and static recrystallization are significantly accelerated by addition of Ca in Mg–Zn–Y alloy, resulting in much smaller grain size and more random texture. The high strength of Mg–Zn–Al–Sn alloys is attributed to the presence of finely distributed Mg2Sn and I-phase particles embedded in the α-Mg matrix.

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Influence of alloying elements on microstructure and microhardness of Mg-Sn-Zn-based alloys

Cited by 26 publications

References 13 publications

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

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

Strengthening mechanisms of indirect-extruded Mg–Sn based alloys at room temperature

Quasicrystal-reinforced Mg alloys

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