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Hpdc Magnesium Alloy

a technology of magnesium alloy and magnesium alloy, applied in the field of magnesium alloy, can solve the problem that none of these alloys is suitable for use at elevated temperatures, and achieve the effect of improving the die castability of alloys

Inactive Publication Date: 2008-08-14
CAST CENT PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0063]Without wishing to be bound by theory, the inclusion of yttrium is believed to be beneficial to melt protection, ductility and creep resistance.
[0068]When present, the beryllium content is preferably less than 50 ppm, more preferably 4-25 ppm, more preferably 4-20 ppm, more preferably 4-15 ppm, more preferably 6-13 ppm, such as 8-12 ppm. Beryllium would typically be introduced by way of an aluminium-beryllium master alloy, such as Al-5% Be, and thus aluminium may be present in small amounts up to 0.25%. Preferably, the aluminium content is less than 0.2%, more preferably less than 0.1%. Without wishing to be bound by theory, the inclusion of beryllium and / or calcium is believed to improve the die castability of the alloy.

Problems solved by technology

Unfortunately, none of these alloys are suitable for use at elevated temperatures.

Method used

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Examples

Experimental program
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example 1

[0075]Two alloys according to the present invention were prepared and chemical analyses of the alloys are set out in Table 1 below. The rare earths other than neodymium were added as a Ce-based misch metal which contained cerium, lanthanum and some neodymium. The extra neodymium and the zinc were added in their elemental forms. Standard melt handling procedures were used throughout preparation of the alloys.

TABLE 1Alloys PreparedElementAlloy AAlloy BNd (wt %)0.60.54Ce (wt %)0.370.36La (wt %)0.320.31Zn (wt %)0.40.41Y (wt %)0.50.18Mg (wt %)BalanceBalanceexcept forexcept forincidentalincidentalimpuritiesimpurities

[0076]The tensile properties of Alloys A and B at room temperature and at 177° C. are set out below in Table 2.

TABLE 2Tensile Properties21° C.177° C.0.2% Proof0.2% ProofStressUTSElong.StressUTSElong.Alloy A1201464.01061326.6Alloy B1141645.71021339.0

[0077]Creep tests were carried out on Alloys-A and B at a constant load of 90 MPa and at a temperature of 177° C. in the as-cast c...

example 2

[0081]A series of alloys according to the present invention were produced and their compositions are listed in Table 4 which includes Alloys A and B referred to in Example 1.

TABLE 4Chemical composition of Alloys A-VZrZrNdCeLaYZnBeAlFe(wt. %,(wt. %,Alloy(wt. %)(wt. %)(wt. %)(wt. %)(wt. %)(ppm)(wt. %)(ppm)soluble)total)A0.600.370.320.500.40—————B0.540.360.310.180.41—————C0.630.410.361.060.43150.10—0.02D0.640.420.381.520.45180.10—0.0050.035E1.180.410.380.750.42190.10—0.0050.03F0.530.630.180.950.43260.11—0.0080.08G0.541.110.180.950.42400.11—0.0180.15H0.620.480.370.270.54150.0717I0.560.440.330.260.57150.0716J0.460.360.280.250.57160.0714K0.650.490.380.370.56150.07250.009L0.580.440.340.390.57180.08270.0050.010M0.490.370.280.400.54170.08200.0050.010N0.670.500.370.540.58160.07260.006O0.580.420.330.570.54180.07220.0050.008P0.480.340.270.600.54180.07270.0050.008Q0.480.350.280.640.80200.07340.0060.010R0.460.340.270.611.12190.07280.0050.010S0.680.510.391.170.570.0134T0.710.510.401.100.5650.0433U...

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Abstract

A magnesium-rare earth-yttrium-zinc alloy consists of 0.2-1.5% by weight zinc and rare earth(s) (RE) and yttrium in amounts which fall within a quadrangle defined by lines AB, BC, CD and DA wherein: A is 1.8% RE-0.05% Y, B is 1.0% RE-0.05% Y, C is 0.2% RE-0.8% Y, and D is 1.8% RE-0.8% Y.

Description

FIELD OF THE INVENTION[0001]The present invention relates to magnesium alloys and, more particularly, to magnesium alloys which can be cast by high pressure die casting (HPDC).BACKGROUND TO THE INVENTION[0002]With the increasing need to limit fuel consumption and reduce harmful emissions into the atmosphere, automobile manufacturers are seeking to develop more fuel efficient vehicles. Reducing the overall weight of the vehicles is a key to achieving this goal. Major contributors to the weight of any vehicle are the engine and other components of the power train. The most significant component of the engine is the cylinder block, which makes up 20-25% of the total engine weight. In the past significant weight savings were made by introducing aluminium alloy cylinder blocks to replace traditional grey iron blocks, and further weight reductions of the order of 40% could be achieved if a magnesium alloy that could withstand the temperatures and stresses generated during engine operation...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C23/06
CPCC22C23/04C22C23/06F05C2201/90F05C2201/028F05C2201/043F02F7/0085
Inventor GIBSON, MARK ANTONYBETTLES, COLLEEN JOYCE
Owner CAST CENT PTY LTD
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