Liquid forging Al-Cu-Zn aluminum alloy and preparation method thereof

Abstract

Belonging to the light alloy design and preparation field, the invention relates to a moderately strong high toughness aluminum alloy material for liquid forging, in particular to a liquid forging Al-Cu-Zn aluminum alloy and a preparation method thereof. The alloy comprises the following main components by mass: 3.2-4.8% of Cu, 1.8-3.0% of Zn, 0.3-0.8% of Mn, 0.08-0.22% of Cd, 0.06-0.24% of Ti, 0.05-0.15% of V, 0.07-0.16% of Zr, 0.005-0.06% of B, 0.002-0.006% of Be, less than or equal to 0.15% of impurity element Fe, less than or equal to 0.1% of Mg, less than or equal to 0.06% of Si, less than or equal to 0.05% of other single impurity element, less than or equal to 0.3% of total impurities, and the balance Al. The Al-Cu-Zn system moderately strong high toughness aluminum alloy mentioned in the invention has the advantages of excellent formability during liquid forging forming, no hot cracking tendency, low porosity and low segregation. After heat treatment, the components prepared from the alloy have excellent strength and plasticity, superiority unmatched by other active alloys, and have broad application prospects.

Description

technical field [0001] The invention belongs to the field of light alloy design and preparation, and relates to a medium-strength and high-toughness aluminum alloy material for liquid die forging, in particular to a liquid die forging Al-Cu-Zn aluminum alloy and a preparation method thereof. Background technique [0002] In recent years, the development of my country's large transport aircraft has progressed smoothly and will soon be assembled in the army. Therefore, high requirements have been put forward for the lightweight of combat armored vehicles. The weight reduction of road wheels and hubs is one of the important technologies. In order to ensure high production efficiency and high product quality, the current road wheel hub is mainly prepared by liquid die forging technology. Due to high performance requirements, Al-Cu alloys are selected. Commonly used alloys include LD5 wrought aluminum alloy and ZL205A cast aluminum alloy. There is no medium-strength and high-toug...

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Problems solved by technology

Due to high performance requirements, Al-Cu alloys are selected. Commonly used alloys include LD5 wrought aluminum alloy and ZL205A cast aluminum alloy. There is no medium-strength and high-toughness aluminum alloy for liquid die forging.

[0003] These two alloys have the following problems in the liquid die forging process: (1) LD5 is a deformed alloy with a Cu content of 1.8-2.6% and a Mg content of 0.4-0.8%, and there is looseness inside the hub during the liquid die forging process. Due to the presence of Mg element, oxides are easily involved in the melt during pressure solidification, resulting in poor metallurgical quality inside the hub and unqualified tensile strength; (2) ZL205A is a high-strength cast aluminum alloy with Cu content It is 4.6-5.3%, but its crystallization range is wide, and there are serious warm tendencies, porosity and segregation phenomena in the process of liquid forging

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