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dearlucy

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dearlucy

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Originally posted by sourbing at 2011-05-23 15:52:57:
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The most commonly used magnesium alloys contain aluminum, zinc, and manganese; aluminum and zinc are added in ingot form, dissolving readily at normal melt temperature (ca. 700 oC). Manganese is added as the anhydrous chloride or as a hardener, for example, Al-5% Mn. The alloying elements are added at 720-750 oC; the alloy is homogenized and then cast.

High-purity magnesium alloys such as AZ91D, AZ91E, and AM60B contain very low levels of the heavy-metal impurities nickel, iron, and copper, resulting in far better corrosion resistance than ordinary alloys. Iron is removed by saturating the melt with manganese at elevated temperature (700-750 oC) and then reducing the temperature, thus precipitating the iron in the form of an AlMnFe intermetallic compound.

Mechanical properties of magnesium alloys improve as grain size is reduced. Carbon inoculation is used commonly to grain-refine aluminum-containing magnesium alloys, the inoculant being added at ca. 780 oC. Zirconium is frequently used to grain-refine alloys lacking aluminum. It is added as a Mg-Zr 30 % hardener above 750 oC. The mechanisms of grain refining are not fully understood, but several theories have been proposed. Both zirconium and magnesium have hexagonal crystal structures with similar lattice parameters, making zirconium an ideal nucleating particle for magnesium.
http://www.magnesium.com/w3/data-bank/index.php?mgw=176
4Â¥2011-05-23 17:02:06
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dearlucy

Ìú³æ (СÓÐÃûÆø)

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Originally posted by imrsfb at 2011-05-23 17:02:06:
The most commonly used magnesium alloys contain aluminum, zinc, and manganese; aluminum and zinc are added in ingot form, dissolving readily at normal melt temperature (ca. 700 oC). Manganese is ad ...

Thank you very much!!!
5Â¥2011-05-24 10:26:22
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arkmix

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dearlucy

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Originally posted by bushliu5516 at 2011-05-24 18:35:21:
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dearlucy

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Originally posted by arkmix at 2011-05-24 17:26:05:
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