Observations of microstructural refinement in Mg–Al–Si alloys containing strontium

Srinivasan, A.; Pillai, U.T.S.; Swaminathan, J.; Das, Suchandan K; Pai, B.C.

doi:10.1007/s10853-006-0643-1

Cited by 60 publications

(27 citation statements)

References 7 publications

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“…2d), the massive Mg 17 Al 12 phase was refined, but some net-shaped Mg 17 Al 12 phase still can be detected. The Mg 2 Si phases in the Mg-12Al-0.7Si-0.09Sr alloy became extraordinarily fine, and their morphology changed from initial Chinese script-shape to granular and/or irregular polygonal shapes, indicating that adding 0.09wt.% Sr can effectively modify and refine the Chinese script-shaped Mg 2 Si phase, which is consistent with the results of Yang Ming-bo et al [15] and Srinivasan et al [16] . However, no new phase was found in the alloy according to the above information from the XRD and EDS results ( Fig.…”

Section: Methodssupporting

confidence: 90%

“…Hence, the key point is to modify the coarse Chinese script shape Mg 2 Si phase in Mg-Al-Si alloys. Recent research [14][15][16] has indicated that Sr and Sb can assist in refining and modifying the Mg 2 Si phase of magnesium alloys. But some disagreement regarding the Sb modification still exists.…”

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confidence: 99%

“…Alternatively, the Mg 2 Si phase can be modified by the addition of 0.12%Sr to AZ61-0.7Si alloy. Srinivasan et al [16] reported that the coarse Chinese script Mg 2 Si precipitates were refined by adding Sr to a Si-containing AZ91 Mg alloy. Previous study shows that both the best microstructural refinement and the highest mechanical properties (tensile strength and elongation) are obtained in Mg-10Al-0.5wt.%Sb [17] and in Sr-modified Mg-AlSi alloys when content of Sr is 0.09wt.% [18][19] .…”

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confidence: 99%

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Modification and refinement effects of Sb and Sr on Mg17Al12 and Mg2Si phases in Mg-12Al-0.7Si alloy

Wang

Jia-lin

et al. 2016

China Foundry

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M agnesium alloys, as the lightest structural metal, show great potential in the automotive, aerospace and electronics industries due to their perfect combination of properties, including low density, high specific strength and specific stiffness, super damping capacity and good castability [1][2][3][4] . Among all the magnesium alloys, MgAl alloys are most widely used due to their low cost and good mechanical properties at room temperature [5] . However, when the content of Al exceeds 9wt.%, the β-Mg 17 Al 12 phase with low melting point tends to form a network along the grain boundaries, which is detrimental to the mechanical properties. Previous study suggested that the network structure of β-Mg 17 Al 12 phase in high-Al magnesium alloys (Al>9%), such as Mg-15Al and Mg12Al, can be broken by the equal channel angular pressing (ECAP), making the plasticity and strength increase simultaneously [6][7] . In addition, with the increase of Al content, the corrosion resistance of Mg-Al alloys was Abstract:The effects of Sb and Sr on the modification and refinement of Mg 17 Al 12 and Mg 2 Si phases in Mg12Al-0.7Si alloy were investigated and compared. The microstructure and mechanical properties of Mg-12Al-0.7Si alloy and its modification mechanism by Sb and Sr were investigated using a scanning electron microscope (SEM), an energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and differential thermal analysis (DTA). The results indicate that by adding 0.5wt.% Sb to the Mg-12Al-0.7Si alloy, the Mg 17 Al 12 phase was refined and broken into some discontinuous island structures. However, some network Mg 17 Al 12 phases still can be detected in Mg-12Al-0.7Si-0.09Sr alloy. Therefore, Sb performs better in modification and refinement of Mg 17 Al 12 phase than does Sr. Small amounts of fine polygonal shaped Mg 2 Si phases were found in Mg-12Al-0.7Si-0.5Sb alloy, while the morphology of Mg 2 Si phases in Mg-12Al-0.7Si-0.09Sr alloy changed from the coarse Chinese script shapes to fine granule and irregular polygonal shapes, indicating that the effects of modification and refinement on Mg 2 Si phase are more significant by adding 0.09wt.% Sr than 0.5wt.% Sb. The ultimate tensile strengths of the Sb and Sr modified Mg-12Al-0.7Si alloys were considerably increased both at room temperature and at 200 ºC.

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Section: Methodssupporting

confidence: 90%

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Modification and refinement effects of Sb and Sr on Mg17Al12 and Mg2Si phases in Mg-12Al-0.7Si alloy

Wang

Jia-lin

et al. 2016

China Foundry

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“…Therefore, other micro-alloying elements such as Sr need to be considered in order to further improve the mechanical properties and castability of the ZA84 alloy. It has been reported that minor Sr can effectively refine the microstructures of the AZ (Mg-Al-Zn) and ZK (Mg-Zn-Zr) system alloys, thus leading to improve the mechanical properties (Ref [6][7][8][9][10][11]. However, the investigation about the effect of Sr addition on the ZA (Mg-Zn-Al) system alloys is very scarce in the literature.…”

Section: Introductionmentioning

confidence: 99%

Effects of Minor Sr on As-Cast Microstructure and Mechanical Properties of ZA84 Magnesium Alloy

Yang

Pan

Cheng

2009

J. of Materi Eng and Perform

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The effects of minor Sr additions on the as-cast microstructure and mechanical properties of the ZA84 magnesium alloy were investigated. The results indicate that adding 0.05-0.15 wt.% Sr to the ZA84 alloy does not cause an obvious change in the morphology and distribution of the Mg 32 (Al,Zn) 49 phase. However, the grains of the Sr-containing ZA84 alloys are effectively refined. Among the Sr-containing ZA84 alloys, the grains of the alloy added 0.10 wt.% Sr are relatively finer than other alloys. Furthermore, adding 0.05-0.15 wt.% Sr to the ZA84 alloy improves the tensile properties at room temperature and 150°C but decreases the creep properties. Among the Sr-containing ZA84 alloys, the alloy added 0.10 wt.% Sr obtains the optimum tensile properties at room temperature and 150°C.

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“…It is well known that the grain refinement is an important method of elevating property and improving formability for magnesium alloys, and recent research results indicated that Sr additions such as Al-Sr master alloys which have been widely used in industrial practice especially for the modification of Al-Si alloys, were thought as to be a potential effective addition of grain refinement for Mg-Al series alloys [5][6][7]. For example, Srinivasan et al and Nam et al [8,9] reported the addition of Al-10Sr master alloy to a Si-containing AZ91-Mg alloy appeared to refine the microstructure, and similar results were obtained in AM50-Mg alloy and AZ91-Mg alloy by Zhao et al and Hirai et al,respectively [10,11]. In addition, Zeng et al and Chen et al [12,13], respectively, reported that adding pure Sr or Al-10Sr alloy to AZ31-Mg alloy effectively reduced its grain size, and similar results were reported by other researchers [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effects of solutionized Al–10Sr master alloys on grain refinement of AZ31 magnesium alloy

Yang

Pan

Cheng

et al. 2008

Journal of Alloys and Compounds

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Observations of microstructural refinement in Mg–Al–Si alloys containing strontium

Cited by 60 publications

References 7 publications

Modification and refinement effects of Sb and Sr on Mg17Al12 and Mg2Si phases in Mg-12Al-0.7Si alloy

Modification and refinement effects of Sb and Sr on Mg17Al12 and Mg2Si phases in Mg-12Al-0.7Si alloy

Effects of Minor Sr on As-Cast Microstructure and Mechanical Properties of ZA84 Magnesium Alloy

Effects of solutionized Al–10Sr master alloys on grain refinement of AZ31 magnesium alloy

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