Grain-refining mechanisms of superheat-treatment of and carbon addition to Mg–Al–Zn alloys

Motegi, Tetsuichi

doi:10.1016/j.msea.2005.08.214

Cited by 66 publications

(55 citation statements)

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“…6,7) The main grain refining methods for this group alloys are superheating, 8,9) FeCl 3 inoculation, 10) carbon inoculation [11][12][13][14][15][16][17][18][19] and addition of solute elements. 4,[20][21][22][23][24][25] Among them, the carbon inoculation has the advantages in the low cost, the low operating temperature and the less fading.…”

Section: Introductionmentioning

confidence: 99%

Effects of Carbon and/or Alkaline Earth Elements on Grain Refinement and Tensile Strength of AZ31 Alloy

Yang

Kuwabara

et al. 2008

Mater. Trans.

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The effects of carbon and/or alkaline earth elements Ca and Sr on the grain refinement and tensile properties of the AZ31 alloy have been investigated in the present study. A significant grain refining efficiency could be obtained for the AZ31 alloy modified by carbon inoculation and the grain refining efficiency could be further improved by the combination of 0.2 mass%C and alkaline earth elements of 0.2 mass%Ca or 0.2 mass%Sr. Compared to the AZ31 alloy without any treatment, the tensile properties of the AZ31 alloy were remarkably improved after being modified by the combination of carbon and a little addition of alkaline earth elements. The ultimate tensile strength and elongation to failure were improved by about 20% and 40%, respectively. After being refined either by 0.2 mass%C or by the combination of 0.2 mass%C and a little addition of alkaline earth elements (0.2 mass%Ca or 0.2 mass%Sr), the main fracture mechanism was changed from cleavage mode with large cleavage planes for the unrefined AZ31 alloy to mixed mode of cleavage and quasi-cleavage fracture. The fracture surfaces were almost composed of small cleavage planes with thin river patterns and quasi-cleavage planes with small dimples and severe plastic deformation.

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Section: Introductionmentioning

confidence: 99%

Effects of Carbon and/or Alkaline Earth Elements on Grain Refinement and Tensile Strength of AZ31 Alloy

Yang

Kuwabara

et al. 2008

Mater. Trans.

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“…5.1) C 2 Cl 6 = 2C + 3Cl 2 (eq. 5.2) 3C + 4Al = Al 4 C 3 Al 4 C 3 is a very effective nucleant for magnesium alloys containing Al [27]- [29]. It is an active heterogeneous nucleating phase for α-Mg, since both Al 4 C 3 and α-Mg have a hexagonal lattice structure [27].…”

Section: Sample Numbermentioning

confidence: 99%

Casting Porosity-Free Grain Refined Magnesium Alloys

Schwam¹

2013

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“…For carbon inoculation of aluminium bearing magnesium alloys, the most commonly accepted mechanism is heterogeneous nucleation and the possible nucleant substrates include Al 4 C 3 and Al 2 CO particles 4,5,[17][18][19][20]24,25 . When SiC particles are taken as refi ner, it is suggested that the SiC particles themselves can also act as the substrates besides these two kinds of particles 17,18 .…”

Section: Grain Refi Ning Mechanism Of Mgcomentioning

confidence: 99%

“…However, the investigation from Qian et al shows that only Mg-Al alloy can be refi ned when pure Mg, Mg-Zn and Mg-Al contain same amount of C (20 ppm) and thus disproves this standpoint 20 . From most of the recent investigations, it can be found that the actual nucleant substrates are Al 4 C 3 particles, but not Al 2 CO particles 16,24,25 . Unfortunately, there is no direct evidence to support this mechanism so far.…”

Section: Grain Refi Ning Mechanism Of Mgcomentioning

confidence: 99%

Grain refinement of AZ91D magnesium alloy by MgCO3

Chen

Jiang

et al. 2011

Mat. Res.

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The grain refining technique of AZ91D magnesium alloy by MgCO 3 has been investigated. The refining mechanism and tensile properties of the resulting alloy have also been discussed. The results indicate that MgCO 3 can decrease its grain size from 311 to 53μm. Correspondingly, the tensile properties are obviously improved. The higher the cooling rate from addition temperature to pouring temperature or the higher the addition temperature, the finer the grains. The melt treated by MgCO 3 should be poured as soon as possible because the inoculation fading is quite quick. The microstructure sensitivity to the diameter of a cast rod is relatively high and the microstructures of the rods with large diameters are quite inhomogeneous. The refining mechanism of MgCO 3 belongs to heterogeneous nucleation and the nucleant substrates are believed to be the Al 4 C 3 particles formed from the reactions between the MgCO 3 and the molten alloy.

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Grain-refining mechanisms of superheat-treatment of and carbon addition to Mg–Al–Zn alloys

Cited by 66 publications

References 0 publications

Effects of Carbon and/or Alkaline Earth Elements on Grain Refinement and Tensile Strength of AZ31 Alloy

Effects of Carbon and/or Alkaline Earth Elements on Grain Refinement and Tensile Strength of AZ31 Alloy

Casting Porosity-Free Grain Refined Magnesium Alloys

Grain refinement of AZ91D magnesium alloy by MgCO3

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