Die cast magnesium alloy
a magnesium alloy and alloy technology, applied in the field of magnesium/zinc/aluminium (mg — zn — al) alloys, can solve the problems of oxidation affecting the stability of magnesium alloys, and affecting the stability of magnesium base alloys, so as to reduce corrosion resistance and mechanical properties, reduce the effect of corrosion resistance and low sound dampening coefficien
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example 1
[0041] Magnesium alloys without beryllium additions and with various amounts of aluminium, zinc and calcium were melted at 700° C. under a sulphur hexafluoride (SF6) containing protective atmosphere, then poured in air into a mould. The top surface of the resulting casting was left exposed to air. Four different types of behaviour were observed depending upon the composition.
[0042] Behaviour1—the surface of the casting initially turned black then ignited as illustrated in FIG. 3.
[0043] Behaviour2—the surface turned black but did not ignite as illustrated in FIG. 4.
[0044] Behaviour3—the surface was initially shiny then later ignited as illustrated in FIG. 5.
[0045] Behaviour4—the surface remained shiny with no ignition as illustrated in FIG. 6.
[0046] Table 1 lists the behaviour observed for a range of different alloys. The addition of more than 10% of zinc was sufficient to prevent burning and resulted in a blackened surface. Calcium additions without zinc produced a shiny surfac...
example 2
[0048] Additional melts were prepared and poured into a mould in the same manner as described above in Example 1. A metal scraper was then applied to the surface of the metal after pouring but while the metal was still molten.
[0049]FIG. 7 illustrates the behaviour of pure magnesium which oxidized so rapidly that it was not possible to expose shiny metal.
[0050]FIG. 8 illustrates the behaviour of a Mg-5% Zn alloy which also oxidized rapidly. Shiny metal could be exposed, but only for a small fraction of a second.
[0051]FIG. 9 illustrates the behaviour of a Mg-10% Zn alloy. The oxidation tendency was greatly reduced as indicated by the absence of “cauliflower-like” growths around the perimeter and the increase in shiny metal exposed.
[0052]FIGS. 10 and 11 illustrate the behaviour of Mg-15% Zn and Mg-20% Zn alloys respectively. In both cases it was relatively easy to expose shiny metal which took several seconds to re-oxidize. Neither formed “cauliflower-like” growths.
[0053] A furthe...
example 3
[0057] Additional melts were prepared and poured into a mould in the same manner as described above in Example 1. The melts contained 13% zinc, 3.6% aluminium and varying amounts of beryllium and calcium. The calcium and beryllium contents of these alloys are given in Table 2. Alloys 1 and 6 were calcium-free and alloys 1-4 were beryllium-free. The final appearance of the castings is shown in FIG. 15. All of the alloys that contained some calcium or beryllium solidified with a shiny skin. Alloy 1 which was free of both calcium and beryllium solidified with a blackened skin.
TABLE 2Magnesium Alloy CompositionsAlloy% Ca% Be120.0430.1040.1950.190.000760.000770.020.000880.050.000890.100.0010
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