A kind of al-cu system casting alloy suitable for forging processing and preparation method thereof

Abstract

The present invention proposes an Al-Cu series casting alloy suitable for forging processing and a preparation method thereof. Aiming at the problem that the Al-Cu series casting alloy with high copper content is difficult to forge, the pouring process is shortened by adding various strengthening elements and inhibiting elements Medium solidification temperature range and increase the grain boundary dragging effect, reduce the generation of dendrites, etc., to achieve the effect of enhancing the forging performance of the material. The percentages of each component and weight in Al-Cu series casting alloy are: Cu: 4%~6%, Mn: 0.5%~1.0%, Si: 0.4%~0.8%, Mg: 0.3%~0.6%, Ti: 0.15% to 0.4%, the remaining impurities <0.5%, and the balance is aluminum. By increasing the content ratio of Mn element and Si element in Al-Cu-based casting alloys, the Si phase is refined and dispersed and the second phase particles (Al 2 Cu, ALCuFeMn compound equal) a large number of dispersed precipitation, the pinning effect is strengthened, which significantly improves the forging performance of Al-Cu series casting alloys. The mechanical properties after forging are tensile strength ≥ 500MPa, yield strength ≥ 350MPa, and elongation ≥ 15%.

Description

technical field [0001] The invention relates to a casting aluminum alloy, in particular to an Al-Cu series casting alloy suitable for forging processing and a preparation method thereof, which has excellent forging properties. Background technique [0002] Al-Cu cast aluminum alloy is a typical high-strength and high-toughness alloy with excellent comprehensive mechanical properties. It has high strength, good ductility and plasticity, and excellent high-temperature performance and machinability. It is currently mainly used as a military and Civilian structural materials have great application prospects in aviation, aerospace, and automotive wheel industries. [0003] However, since the Al-Cu cast aluminum alloy has a wide crystallization temperature range, and there is Al with poor plasticity in the eutectic structure during solidification 2 Cu phase, easy to crack. At the same time, due to the different solidification speeds of structural parts during the production proc...

AI Technical Summary

Problems solved by technology

However, during the thermal processing of aluminum alloys, the casting structure is transformed into a processed structure, accompanied by dynamic recovery and dynamic recrystallization phenomena. Dynamic recovery includes dislocation formation, migration and annihilation phenomena, which occur in all metal thermal processing processes, as High-level dislocation energy metals, dislocations in aluminum alloys are easy to move, so the traditional discontinuous dynamic recrystallization phenomenon of nucleation and grain growth is difficult to occur. Generally, the dynamic recrystallization mechanism in the thermal processing of aluminum alloys is continuous. Dynamic recrystallization, the formation of small-angle grain boundaries in the cast original grains, and then the transformation from small-angle grain boundaries to high-angle grain boundaries, resulting in deterioration of mechanical properties

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