High conductivity copper-magnesium alloy for automobile electrical equipment

Abstract

The invention discloses a high-conductive Cu-Mg alloy of automobile, which is characterized by the following: adding 0.001-0.1% phosphor, 0.4-0.8% magnesium and copper; making the stretch-proofing strength Ra at 460MPa-520Mpa and extending rate A50mm not less than 6%; obtaining the product with Hv at 140-165 and conductive rate not less than 62%IACS.

Description

Technical field: [0001] The invention relates to a copper alloy, in particular to a high-conductivity copper-magnesium alloy for automobile electrical appliances. Background technique: [0002] Copper has long been used to increase strength by alloying it with different elements. With few exceptions, additives increase strength while disproportionately reducing conductivity. The peak tensile strength is about 421.86×10 5 kg / m 2 (60 ksi) pure copper has a conductivity of 100% IACS. Therefore, the coefficient of strength×conductivity of pure copper is 6,000 (60×100) units. As an ancient copper alloy, brass has a strength of up to 731.22×10 5 kg / m 2 (104ksi), but the conductivity drops sharply. Cartridge brass, the most commonly used brass, has a strength x conductivity coefficient of less than 3,000 units. Other alloys such as bronze and copper-nickel alloys have much lower strength x conductivity coefficients than pure copper. [0003] Japanese Patent No. 53-19920 re...

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Problems solved by technology

Therefore, the alloy has poor ductility, formability, softening resistance, and low strength × conductivity coefficient