High-strength heat-resisting aluminum alloy and preparation method thereof

Abstract

The invention discloses a high-strength heat-resisting aluminum alloy and a preparation method thereof. The element weight percentage of the alloy is AlCuMn<c>Ce<d>Ni<e>Zr<f>, wherein 83.75<=a<=89.9, 7.0<=b<=9.0, 0.5<=c<=2.0, 1.0<=d<=2. 5, 1.5<=e<=2.5, 0.1<=f<=0.25, and a+b+c+d+e+f=100. The preparation method comprises the steps that a heat-resisting aluminum alloy system is selected; alloycomposition is adjusted according to an alloy solidification path; an alloy ingot is prepared; free forging of the alloy ingot is carried out; a solid solution of a forged billet is carried out; agingheat treatment is carried out; and a heterogeneous cross-scale strengthened structural organization is obtained, namely, nano-scale intermetallic compound heat-resisting phases are uniformly separated out from the inner parts of grains to strengthen a matrix, micrometer-scale heat-resisting intermetallic compounds are continuously and uniformly distributed on the grain boundaries to stabilize thegrain boundaries, and materials with the excellent high-temperature tensile strength and elongation are obtained. According to the alloy materials, the tensile strength reaches 116 MPa and the elongation reaches 37.5% at 400 DEG C, compared with an existing ZL208 alloy (T6), the tensile strength is improved by 31.8%, and the elongation is improved by 2.5 times.

Description

technical field [0001] The invention belongs to heat-resistant aluminum alloy material technology, in particular to a high-strength heat-resistant aluminum alloy material and a preparation method thereof. Background technique [0002] Facing the severe challenges of resources, energy and environment, in order to reduce energy consumption, save resources and protect the environment, manufacturing industries such as aircraft and automobiles have increasingly urgent requirements for high performance and lightweight structural materials. Aluminum and aluminum alloys have many advantages such as low density, high strength, good processing performance, and corrosion resistance. As excellent structural materials, they have been widely used in many fields such as aerospace, building bridges, automobiles, ships, and mechanical equipment. Among them, the heat-resistant aluminum alloy has excellent high-temperature oxidation resistance and good plastic deformation resistance and yield ...

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Problems solved by technology

The ingot production method and widely used heat-resistant aluminum alloys such as ZL208 have a small volume fraction of heat-resistant phases, and the strengthening effect is insufficient, which can only be used at temperatures below 350 °C

Although the service temperature of the ZL207 alloy reaches 400°C, a large number of fine-network heat-resistant phases at the grain boundaries of the material cause brittleness, resulting in too low plasticity at 350°C~400°C, which cannot replace titanium in the temperature range of 350~400°C. Alloys cannot meet the development requirements of lightweight

In addition, composite materials often result in lower material plasticity due to limited interfacial bonding strength

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