A kind of rare earth oxide modified copper-nickel-silicon alloy material and its preparation method and application

Abstract

The invention belongs to the technical field of high-performance copper alloy materials, and discloses a rare earth oxide modified copper-nickel-silicon alloy material and a preparation method and application thereof. All the components include, by weight percentage, 1.1%-4.1% of nickel, 0.1%-2.1% of silicon, 0.01%-1.2% of rare earth oxide, and the balance copper and unavoidable impurities, wherein the rare earth oxide is strontium lanthanum manganese oxide (the atomic ratio of strontium is 0.01-0.29, and the atomic ratio of lanthanum is 0.01-0.59), and a vacuum induction smelting method is adopted. Part of the rare earth oxide in the rare earth oxide modified copper-nickel-silicon alloy material focuses in front of a solid-liquid interface, constitutional supercooling is caused, the cast structure is refined, and the dendrite arm spacing is reduced. Part of fine rare earth oxide particles enter grains to serve as heterogeneous nucleation points, and formation of isometric crystal is promoted. The rare earth oxide has a doping effect, thereby playing a role as modificator and affecting the separating-out number and distribution of a second phase. Finally, on the premise of guaranteeing the tensile strength of the cast alloy, the elongation is greatly improved, and the cast alloy has good plasticity.

Description

technical field [0001] The invention belongs to the technical field of high-performance copper alloy materials, and in particular relates to a rare earth oxide modified copper-nickel-silicon alloy and its preparation method and application. Background technique [0002] Cu-Ni-Si alloy is a precipitation-strengthened alloy, which has high strength and medium electrical conductivity after aging. Because it does not contain toxic elements such as Co and Be, and its cost is low, it is widely used in generator rotor wedges. Different from pure copper materials, as-cast Cu-Ni-Si alloys have high tensile strength but insufficient toughness, and cracking often occurs during ingot rolling or extrusion. [0003] Rare earths are often referred to as the "vitamins" of metal materials. Because of their active chemical properties, adding trace amounts of rare earth elements can significantly improve the performance of materials. At present, the addition of rare earth elements to prepare...

AI Technical Summary

Problems solved by technology

In the process of realizing the present invention, the inventors found that the strontium lanthanum manganate used in the present invention is a kind of perovskite rare earth oxide, which is currently widely used in magnetic sensors or heating elements, but its application in metal materials but rarely reported

Moreover, when rare earths or intermediate alloys are used to smelt alloys, they often only pay attention to the improvement of their strength, hardness, and electrical conductivity, while ignoring the influence of rare earths on the plasticity and toughness of the alloy.

Copper-nickel-silicon alloy has high strength in the as-cast condition, but its plasticity is low, and cracking often occurs in the subsequent extrusion or rolling process, which increases the scrap rate and increases the production cost

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