Effects of aging on the microstructures and mechanical properties of extruded AM50 + xCa magnesium alloys

Wang, Qudong; Peng, Jinghua; Suéry, M.; Blandin, Jean‐Jacques

doi:10.1016/s1001-0521(06)60071-5

Cited by 7 publications

(5 citation statements)

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“…In recently developed magnesium alloys, Mg-Y-RE-Zr alloys attracted significant interest in different countries. The binary and multiple intermetallic compounds formed by yttrium (Y) and rare earth metals (RE) with magnesium matrix can greatly improve the mechanical properties of magnesium alloys at both room and elevated temperatures [1][2][3][4][5][6][7][8]. It has been reported that the Mg-Y-RE-Zr alloys such as Mg-9Gd-4Y-0.6Zr and Mg-3Y-4RE exhibit higher specific combination properties than conventional Al and Mg alloys, and their ultimate tensile strength, yield strength, and elongation could reach about 400 MPa, 300 MPa, and 10%, respectively [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and mechanical properties of Mg-5Y-5Gd-xNd-0.5Zr magnesium alloys at different states

Zhang

et al. 2010

Rare Metals

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The microstructural evolution and mechanical properties of Mg-5Y-5Gd-xNd-0.5Zr magnesium alloys at different states were studied. The results reveal that island compounds at the grain boundaries of the as-cast alloys mainly were Mg 24 Y 5 , Mg 41 Nd 5 , and Mg 5 Gd phases. After homogenization at 808 K for 24 h, the distribution of the island compounds became discrete and Mg 5 Gd phases mostly decomposed and dissolved. With hot extrusion, the grain size was refined to about 20 μm on average, and both the strength and elongation were greatly improved. After ageing at 523 K for 5 h, the strength of different extruded alloys largely increased but the elongation decreased. With the increase of neodymium content, the strength of the alloys at different states increased. The content of neodymium element had an obvious effect on the elongation of the designed alloys. In the designed alloys, the Mg-5Y-5Gd-2.2Nd-0.5Zr alloy exhibited the best combination properties and its ultimate tensile strength, yield strength, and elongation could reach 380 MPa, 285 MPa, and 9.0%, respectively.

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Section: Introductionmentioning

confidence: 99%

Microstructural evolution and mechanical properties of Mg-5Y-5Gd-xNd-0.5Zr magnesium alloys at different states

Zhang

et al. 2010

Rare Metals

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“…By the course of solidification, before α-Mg precipitated, with the yttrium addition, yttrium firstly precipitated thermally stable phase with aluminum, its distribution is dispersive. Al 2 Y phase take aluminum from the liquid, lead to constitutional supercooling to refine the grain size, and stop β-Mg 17 Al 12 to become coarse [6]. But with the increase of yttrium content, Al 2 Y phase grow quickly, its distribution is not dispersive anymore, the effect of refine microstructure is bring down.…”

Section: Resultsmentioning

confidence: 99%

“…7 shows, β-Mg 17 Al 12 phase is precipitated again, and lead to the increase of yield strength and slightly decrease of ultimate strength and elongation. But because of the refine to morphology of β-Mg 17 Al 12 phase, properties of test alloys still better than as-cast alloys [5][6][7].…”

Section: Resultsmentioning

confidence: 99%

“…Alloying and heat treatment are effective methods to refine Mg-Al alloys. As important alloying elements to magnesium alloys for their effect to improve casting characteristics, high temperature properties and refine the gain size, rare earths are usually used to improve microstructure and properties [2][3][4][5][6]. However, study on the composite effect of yttrium alloying and heat treatment is very limited.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Yttrium and Heat Treatment on Microstructure and Mechanical Properties of AM60 Alloy

Tian

Cao

Meng

2011

AMR

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The effect of yttrium addition and heat treatment on the mechanical properties and microstructure of AM60 magnesium alloy have been investigated using X-ray phase analysis, microstructure investigation, tensile test, hardness measurement and fracture surfaces analysis. The results showed that the mechanical properties of the alloys were obviously improved with the addition of yttrium no more than 1.0%. The reinforcement of the alloys resulted from the appearance of Al2Y phase. After solid-solution treatment (T4), the Mg17Al12 phase almost dissolved in Mg matrix, but the rare earth compounds Al2Y phase was rather stable. The ultimate tensile strength σb was improved, but the yield strength σ0.2 and elongation δ were only slightly changed. After solid-solution + aging treatment (T6), the Mg17Al12 phase precipitated again and their morphology was changed. The yield strength σ0.2 was improved.

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“…The Al 2 Ca on the grain boundaries can restrict the movement of grain boundaries during solidification. 19) Therefore, the Al 2 Ca compound is expected to refine grains together with the dendrite cells. Al atoms are used for the formation of the Mg 32 (Al,Zn) 49 phase during solidification.…”

Section: Effect Of Ca On the Grain Refinementmentioning

confidence: 99%

Effect of Ca Addition on Precipitation Behavior of Mg–6.0 mass%Zn–3.0 mass%Al Alloy

et al. 2012

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The effect of 0.5 mass%Ca addition on the precipitation behavior of a Mg6.0 mass%Zn3.0 mass%Al (ZA63) alloy was investigated. The as-cast ZA63 and Ca-added alloys were homogenized and solid solution treated at 673 K for 12 and 1 h, respectively, followed by waterquenching. Then, both alloys were aged at 343, 373, 403 and 433 K. The cast ZA63 and Ca-added alloys were mainly composed of the primary ¡-Mg and Mg 32 (Al,Zn) 49 phases. The Al 2 Ca phase was detected co-existing in the Ca-added alloy. The Ca addition caused the grain refinement and improved hardness after the solid solution treatment compared with the ZA63 alloy even with the trace amount of 0.5 mass% Ca. The peak hardness of the Ca-added alloy aged at each temperature was higher than that of the ZA63 alloy. The microstructures of the ZA63 and Ca-added alloys produced by peak aging at 433 K consist of rod-like, blocky, plate-like and lath-like precipitates. Moreover, the precipitates in the Caadded alloy are more finely and densely distributed than those in the ZA63 alloy even though the volume fraction of precipitates in the Ca-added alloy estimated by the electrical conductivity during aging at 433 K for longer than 64 h is smaller than that in the ZA63 alloy. The Cliff-Lorimer plots of the EDS results for the ¢ 0 1 phase in the Ca-added alloy aged at 433 K for 1000 h were examined. It was confirmed that the ¢ 0 1 phase in the Ca-added alloy contained Ca atoms, indicating that Ca atoms inside the ¢ 0 1 phase might change the structure and/or composition of precipitates.

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Effects of aging on the microstructures and mechanical properties of extruded AM50 + xCa magnesium alloys

Cited by 7 publications

References 4 publications

Microstructural evolution and mechanical properties of Mg-5Y-5Gd-xNd-0.5Zr magnesium alloys at different states

Microstructural evolution and mechanical properties of Mg-5Y-5Gd-xNd-0.5Zr magnesium alloys at different states

Influence of Yttrium and Heat Treatment on Microstructure and Mechanical Properties of AM60 Alloy

Effect of Ca Addition on Precipitation Behavior of Mg–6.0 mass%Zn–3.0 mass%Al Alloy

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Effects of aging on the microstructures and mechanical properties of extruded AM50 + xCa magnesium alloys

Cited by 7 publications

References 4 publications

Microstructural evolution and mechanical properties of Mg-5Y-5Gd-xNd-0.5Zr magnesium alloys at different states

Microstructural evolution and mechanical properties of Mg-5Y-5Gd-xNd-0.5Zr magnesium alloys at different states

Influence of Yttrium and Heat Treatment on Microstructure and Mechanical Properties of AM60 Alloy

Effect of Ca Addition on Precipitation Behavior of Mg&ndash;6.0 mass%Zn&ndash;3.0 mass%Al Alloy

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Effect of Ca Addition on Precipitation Behavior of Mg–6.0 mass%Zn–3.0 mass%Al Alloy