Braser aluminium

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Colours reddish or pinkish purple and lighter purples. the hardness of the jewellery alloy remains substantially similar to that of the AuAl 2 intermetallic compound; that is to say, the hardness of the jewellery alloy is within about 6%, more preferably 5%, of the hardness of AuAl 2 . the gold content may be above 78.5 wt % up to a maximum of 83.5 wt %, with the balance being aluminium. In this way, the requisite toughness is achieved by producing a gamma-phase gold aluminium structure. the jewellery alloy may have a gold content of less than 78.5 wt % and further comprise an additional element selected from the group consisting of palladium and nickel. the aluminium content may preferably be 18.5-19.5 wt %. the gold/aluminium ratio is preferably higher than 3.66. the amount of palladium when used as the additional element is in the range 0.5 wt % to 4.0 wt %; the amount of nickel when used as the additional element is in the range 1.0 wt % to 2.0 wt %. a jewellery alloy containing 16.5-21.5 wt % aluminium, 0-4.0 wt % palladium, 0-2 wt % nickel and balance gold (except for impurities and incidental elements). the jewellery alloy may optionally contain small or trace amounts of elements, (eg oxygen) either constituting incidental constituents added in accordance with established practice or present as impurities. the jewellery alloy may be a binary alloy containing at least 16.5 wt % up to (but not including) 21.5% aluminium, and balance

%, with the balance being aluminium. In this way, the requisite toughness is achieved by producing a gamma-phase gold aluminium structure. In another embodiment, the jewellery alloy may have a gold content of less than 78.5 wt % and further comprise an additional element selected from the group consisting of palladium and nickel. The aluminium content may preferably be 18.5-19.5 wt %. The gold/aluminium ratio is preferably higher than 3.66. In preferred alloys, the amount of palladium when used as the additional element is in the range 0.5 wt % to 4.0 wt %; the amount of nickel when used as the additional element is in the range 1.0 wt % to 2.0 wt %. There is also provided an article comprising a metal component, wherein the metal component is fabricated from a jewellery alloy in accordance with the present invention. In accordance with a second aspect of the present invention, there is provided a jewellery alloy containing 16.5-21.5 wt % aluminium, 0-4.0 wt % palladium, 0-2 wt % nickel and balance gold (except for impurities and incidental elements). The jewellery alloy may optionally contain small or trace amounts of elements, (eg oxygen) either constituting incidental constituents added in accordance with established practice or present as impurities. In one embodiment, the jewellery alloy may be a binary alloy containing at least 16.5 wt % up to (but not including) 21.5% aluminium, and balance gold. In a second embodiment, the jewellery alloy may contain 0.5-4.0 wt % palladium, with nickel substantially

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