Effects of Ca and Sr addition on mechanical properties of a cast AZ91 magnesium alloy at room and elevated temperature

Hirai, Kinji; Somekawa, Hidetoshi; Takigawa, Yorinobu; Higashi, Kenji

doi:10.1016/j.msea.2005.05.028

Cited by 233 publications

(101 citation statements)

References 24 publications

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“…The effects of strontium on the grain size of magnesium and its alloys were found to be also obvious, [22][23][24][25][26][27][28][29][30][31][32][33] which could be used to improve the plasticity and formability of magnesium alloys, although little work has been carried out on effects of strontium on the plasticity and formability. The research results obtained by Lee et al 22) showed that the grain size of magnesium and its alloys with low Al content could be reduced by adding minor Sr, but the refinement efficiency for magnesium alloys with high Al content was not obvious.…”

Section: Microstructure Of New Type Magnesium Alloys Containing Stronmentioning

confidence: 99%

“…9). Kinji Hirai et al 31) investigated the effects of Ca and Sr additions on the microstructure of a cast AZ91 magnesium alloy, and found that the grain size was decreased to about 40 mm with adding the Sr element to AZ91. It was noted that the grain size in AZ91 + Ca + Sr alloy is finer than that in AZ91 + Sr alloy, and the grain size with adding 0.5 mass% Sr and 1.0 mass% Ca was further refined to be about 17 mm.…”

Section: Microstructure Of New Type Magnesium Alloys Containing Stronmentioning

confidence: 99%

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Mechanical Properties and Microstructure of Magnesium-Aluminum Based Alloys Containing Strontium

et al. 2008

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The mechanical properties and processing performances of conventional magnesium alloys still could not meet the need of important application fields due to some demerits, such as poor formability, low creep resistance and unsatisfactory strength at elevated temperature. Recent investigations have shown that additions of strontium to magnesium alloys are effective in improving creep resistance of the alloys at temperatures above 150 C, and some new types of magnesium alloys containing strontium have been developed. The mechanical properties and microstructure of magnesium-aluminum based alloys containing strontium are reviewed, and the considerable discrepancy among the research results is discussed. Special attentions are paid to the mechanical properties, compounds and grain refinement of Mg-Al-Sr based alloys. The Sr/Al ratio is thought to be important to control the microstructure of Mg-Al-Sr alloys. The mechanism of grain refinement caused by strontium addition in magnesium alloys remains unclear.

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Section: Microstructure Of New Type Magnesium Alloys Containing Stronmentioning

confidence: 99%

Section: Microstructure Of New Type Magnesium Alloys Containing Stronmentioning

confidence: 99%

Mechanical Properties and Microstructure of Magnesium-Aluminum Based Alloys Containing Strontium

et al. 2008

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“…RE addition to Mg-Al alloys was proven to solve the problem initially [2][3][4]. And the low cost alkaline-earth elements with smaller density, especially the combined Ca and Sr addition, were chosen to try to replace RE additions [5][6][7][8]. Therefore, it was necessary to focus on the properties of the introduced intermetallic compounds.…”

Section: Introductionmentioning

confidence: 99%

Structural stability and elastic constants of precipitate phases of Mg-5%Al alloy with combined Ca and Sr addition from first-principles calculations

Luo¹,

Tang²,

Du³

et al. 2016

Proceedings of the 2016 5th International Conference on Environment, Materials, Chemistry and Power Electronics

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Abstract. The calculated lattice parameters and enthalpies of formation of A1 2 Ca, Al 2 Sr，A1 4 Ca, Al 4 Sr， Mg 2 Ca,and Mg 2 Sr phase in Mg-Al-Ca-Sr alloy system were compared with both calculation results and experimental data published in references available, and the structural stability of these intermetallic compounds phases were estimated from the energetic point of view. The results showed that A1 2 Ca phase had a higher structural stability. After further calculation of lattice parameters and enthalpies of formation of Al 2 (Ca,Sr) phase with Sr and Ca variation respectively, the structural stability of Al 2 (Ca,Sr) phase was predicted from the thermodynamic point of view. The results showed that Al 2 (Ca,Sr) phase had a good alloying ability and the Al 2 (Ca,Sr) with various Ca/Sr atom ratio was either stable, which demonstrated the mutual solubility of Ca and Sr in Al 2 (Ca,Sr) phase. The elastic constants and mechanical parameters for Mg, Al 2 (Ca, Sr) and Al 4 Sr in Mg-5%Al-Ca-Sr alloy were further calculated. Results showed that the obtained elastic constants and mechanical parameters of Mg were accordant with the experimental results and Al 4 Sr is both of the best ductility and plasticity, while Al 2 (Ca, Sr) is both of poorest ductility and plasticity in Mg-Al-Ca-Sr alloy.

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“…It has been reported that Mg alloys containing Ca show high creep resistance and elevated temperature strength. [2][3][4][5][6] Besides, Ca is effective as fire retardant. 7) For commercial applications, Ca is desirable as an additional element to Mg because of its lower cost, compared with rare earth elements.…”

Section: Introductionmentioning

confidence: 99%

Tensile Properties of Forged Mg-Al-Zn-Ca Alloy

et al. 2008

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Continuously-casted Mg-9Al-1Zn-1Ca (in mass%) alloy (Mg-Ca alloy) and Mg-9Al-1Zn alloys (Ca-free Mg alloy) were forged at 573 K and their mechanical properties were investigated by tension tests at ambient temperature and 573 K. The forged Mg-Ca alloy showed higher 0.2% proof stress than the forged Ca-free Mg alloy. The high strength for the Mg-Ca alloy was attributed not only to grain refinement by hot forging, but also to the strengthening mechanisms arising from the difference in thermal expansion and geometrical incompatibility between Mg matrix and second phase. The Ca addition decreased the elongation to failure; however, the decrease was reduced for the forged specimens, compared to the unforged specimen. This results from segmentation of the second phases by the hot forging. Also, the forged Mg-Ca alloy showed a large elongation of 284% at 573 K.

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Effects of Ca and Sr addition on mechanical properties of a cast AZ91 magnesium alloy at room and elevated temperature

Cited by 233 publications

References 24 publications

Mechanical Properties and Microstructure of Magnesium-Aluminum Based Alloys Containing Strontium

Mechanical Properties and Microstructure of Magnesium-Aluminum Based Alloys Containing Strontium

Structural stability and elastic constants of precipitate phases of Mg-5%Al alloy with combined Ca and Sr addition from first-principles calculations

Tensile Properties of Forged Mg-Al-Zn-Ca Alloy

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