Effect of extrusion on microstructures, and mechanical and creep properties of Mg–Al–Sr and Mg–Al–Sr–Ca alloys

Bai, Jing; Yangshan, Sun; Xue, Feng; Xue, Songbai; Jin, Qiang; Wei, Tao

doi:10.1016/j.scriptamat.2006.08.020

Cited by 65 publications

(40 citation statements)

References 9 publications

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“…This is attributed to the discontinuous grain boundary precipitation of a low melting point γ phase from the supersaturated solid solution of α-Mg along with the coarsening of γ in the interdendritic eutectic region at elevated temperatures [6]. In order to circumvent the deleterious effect of the γ phase, several alloying elements such as Ca, Sr and rare earth elements that are preferentially reactive to Al over Mg have been added to Mg-Al alloys [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure of Mg-4Al-Nd Alloys

2017

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Abstract:In the present work, Mg-4Al-xNd (x = 0, 1, 4 wt.%) alloys were prepared by a stir casting method, and the effect of the addition of Neodymium (Nd) as-cast and of heat-treated microstructures was studied. The addition of 1 wt.% Nd preferentially formed the Al 2 Nd phase and completely suppressed the formation of the intermetallic Mg 17 Al 12 (γ) phase, which was initially present in the base alloy (Mg-4Al alloys). On increasing the Nd percentage from 1 to 4 wt.% in the base alloy, two intermetallic phases, Al 2 Nd and Al 11 Nd 3, were observed in the microstructure, as higher levels of Nd led to a peritectic reaction between Al and the Al 2 Nd phase, and part of the Al 2 Nd transformed into the Al 11 Nd 3 phase. The hardness of the as-cast alloy increased with the Nd content. Thus, the hardness increased from 57.1 ± 4.1 Hv of Mg-4Al to 66.5 ± 2.6 Hv of Mg-4Al-4Nd. It was also found that solutionizing and isothermal aging of alloys containing Nd at 180 • C for 96 h led to the size reduction of Al-and Nd-containing intermetallics without altering their morphologies. Further, it was found that Nd does not have any effect on the aging kinetics of the alloys because all of the alloys with and without Nd attained peak hardness at 24 h of aging time.

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Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure of Mg-4Al-Nd Alloys

2017

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“…However, only a few studies have been made on the MgAl-Ca-Sr quaternary system containing higher than 1 mass% Sr. Jing et al 11) reported that the Al 4 Sr compound precipitated in Mg-4Al-2Sr alloys shows two morphologies: one is lamellar eutectic with -Mg; the other is film-shaped divorced eutectic. They showed that the addition of 1 mass% of Ca to Mg-(4-7)Al-(1-2)Sr alloys forms thin lamellar-type Mg 2 Ca compounds and coarse lamellar-type (Mg,Al) 2 Ca compounds as well as bulky Mg-Al-Sr ternary compound; however, they were unable to identify the crystal structure of the bulky ternary phase.…”

Section: Introductionmentioning

confidence: 99%

“…They showed that the addition of 1 mass% of Ca to Mg-(4-7)Al-(1-2)Sr alloys forms thin lamellar-type Mg 2 Ca compounds and coarse lamellar-type (Mg,Al) 2 Ca compounds as well as bulky Mg-Al-Sr ternary compound; however, they were unable to identify the crystal structure of the bulky ternary phase. 8,11) This study investigates the influence of the Sr content on the microstructural, tensile, and creep properties of Mg-5Al-3Ca alloys at room temperature and elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Strontium Addition on the Microstructures and Mechanical Properties of Mg-5Al-3Ca Alloys

2011

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The effect of adding up to 4 mass% of strontium to Mg-5Al-3Ca alloys was investigated in terms of microstructural and mechanical properties. The major interdendritic intermetallic compounds of as-cast alloys changed from the Mg 2 Ca phase to a combination of the (Mg,Al) 2 Ca and Al 4 Sr phases. The morphology of the interdendritic -Mg/Al 4 Sr eutectic phase also changed from a coarse lamellar structure at a low strontium concentration to a bulk-like ultrafine lamellar structure at a high strontium concentration (4 mass%). The creep resistance was improved by the addition of up to 2 mass% strontium but it was saturated at a higher strontium concentration.

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“…8) Until now, there are few studies on grain refinement mechanical properties of the Mg-Al-Ca alloys after the grain refinement. [9][10][11][12] In the present paper, Mg-Al-Zn-Ca and MgAl-Zn alloy are forged at 573 K and the mechanical properties of the forged and unforged alloys are investigated by tension tests at ambient temperature and 573 K. Based on the results, effects of Ca addition on the mechanical properties are discussed.…”

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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Effect of extrusion on microstructures, and mechanical and creep properties of Mg–Al–Sr and Mg–Al–Sr–Ca alloys

Cited by 65 publications

References 9 publications

Effect of Heat Treatment on the Microstructure of Mg-4Al-Nd Alloys

Effect of Heat Treatment on the Microstructure of Mg-4Al-Nd Alloys

Effect of Strontium Addition on the Microstructures and Mechanical Properties of Mg-5Al-3Ca Alloys

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

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