Investigations of the properties of Mg–4Al–2Sn–1Ca–xCe alloys

Kim, Byeong Ho; Park, Kyung Chul; Park, Taesung; Park, Ik Min

doi:10.1016/j.msea.2010.06.055

Cited by 33 publications

(16 citation statements)

References 17 publications

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“…The improved tensile strength at room temperature and at 150 °C due to 0.09 wt% Ti alloying can be mainly attributed to two aspects: (1) The grain boundary strengthening resulting from the smaller SDAS, according to the Hall-Petch equation, which is supported by a number of findings [19][20][21] . (2) Solid solution strengthening caused by Sn and Zn, and precipitate strengthening caused by the refined thermally stable Mg 2 Sn phases, which can effectively impede mobile dislocation, pin grain boundaries and hinder crack propagation [22][23][24] . The A2 alloy shows relatively poor YS, which is related to the continuous network structure of lamellar eutectic phases, as well as the massive-like Zn-rich regions.…”

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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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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“…The larger surface volume of the grain boundary effectively acted as a dislocation barrier, which increased the deformation resistance. 8) According to the Hall-Petch relationship grain refinement can obviously increase the YS of Mg alloys due to the increased value of the coefficient k value. 19) The quantitative grain size of the experimental alloys needed for calculating YS ( 0:2 ) shows in Table 2.…”

Section: Fracture Behaviormentioning

confidence: 99%

“…Earlier studies investigated some single RE such as La, Ce, Nd and Sm. [6][7][8][9][10] However, no research about the effects of ytterbium (Yb) addition on the microstructure and mechanical properties of Mg alloys has been reported.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Microstructure and Mechanical Properties of Mg-Al-Yb Alloys

Park

Kim

et al. 2011

Mater. Trans.

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The effects of Yb addition on the microstructure and mechanical properties of Mg-5Al alloy are investigated. The results indicate that the addition of Yb to the Mg-5Al alloy facilitates the formation of a thermally stable Al 2 Yb phase, the refinement of the microstructure and the suppression of the volume fraction of Mg 17 Al 12 phase in Mg-5Al alloy. Yb addition has little effect on the mechanical properties of the experimental alloys tested at room temperature. At elevated temperatures, however, the ultimate tensile strength (UTS) is significantly increased by Yb addition and Mg-5Al-1Yb has the highest UTS value than other experimental alloys. On the other hand, the yield strength (YS) increases at all tested temperatures due to the grain refinement and dispersion strengthening of the secondary phase. Meanwhile, the elongation (") of the experimental alloys decreases at all tested temperatures. Tensile fractographic analysis indicates that cleavage fracture is the dominant mechanism of the Mg-5Al and Mg-5Al-xYb alloys at room temperature. At elevated temperatures, however, the fracture mechanism of experimental alloys mainly changes from cleavage to quasi-cleavage fracture.

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“…마그네슘 합금은 밀도가 알루미늄 합금의 2/3인 1.74 g/cm 3 로 실용 구조용 재료 중에서 가장 가볍고, 높은 비강도, 진동 감쇠능 및 전자파 차폐성과 같은 우수한 고유 특성들로 인해 경량화를 통한 연비향상이 기대되어지는 자동차 및 항공기 등 의 수송기기 부품 소재로서 많은 각광을 받고 있다 [1][2][3][4][5]. 현재 마그네슘 합금은 자동차용 스티어링 코어, 시트 프레임, 에어백 하우징 등에 적용되기 시작하고 있으며, 대표적인 상용합금은 Mg-Al-Zn 계열인 AZ91D 합금, Mg-Al-Mn 계열인 AM60 합금등이 있다 [6][7][8][9][10].…”

Section: 서 론unclassified

Microstructure and Corrosion Behavior of Mg-xSn (x = 1, 3, 5, 7, 9 wt.%) Alloys

Kang¹,

Kim²,

Jo³

et al. 2011

Journal of the Korea Foundry Society

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Mg-xSn(x = 1, 3, 5, 7, 9 wt.%) 합금의 미세조직 및 부식특성 AbstractIn the present work, the corrosion properties of Mg-xSn (x = 1, 3, 5, 7 and 9 wt.%) alloys have been investigated. Potentiodynamic polarization and immersion tests were carried out in 3.5% NaCl solution of pH 7.2 at room temperature to measure the corrosion properties of Mg-xSn (x = 1, 3, 5, 7 and 9 wt.%) alloys. With increase of the Sn contents, the volume fraction of the Mg 2 Sn phase was increased. The corrosion rate of Mg-xSn alloys was increased up to 7 wt.%Sn and decreased above 9 wt.%Sn. Initiation of galvanic site during immersion mainly occurred at Mg/Mg 2 Sn interface and propagation went into α-Mg. For this reason, corrosion properties of Mg-xSn (added from 1 wt.%Sn to 7 wt.%Sn alloys) alloys are decreased because the galvanic site was increased with increasing Sn addition. In Mg-9wt.%Sn alloy, however, the corrosion site were changed from Mg/Mg 2 Sn interface to α-Mg/M 2 Sng interface in lamellar structure. Preferentially corrosion of α-Mg/M 2 Sn interface in lamellar structure impeded corrosion propagation went into α-Mg. Fig. 1은 Mg-xSn (x = 1, 3, 5, 7, 9 wt.%)합금의 주방상태 의 광학현미경 미세조직 사진이다. Sn이 1 wt% 첨가된 Mg1Sn 합금 (Fig. 1-a 실험 결과 및 고찰 미세조직− 364 −

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Investigations of the properties of Mg–4Al–2Sn–1Ca–xCe alloys

Cited by 33 publications

References 17 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

Investigation on the Microstructure and Mechanical Properties of Mg-Al-Yb Alloys

Microstructure and Corrosion Behavior of Mg-xSn (x = 1, 3, 5, 7, 9 wt.%) Alloys

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