Al-Cu series casting alloy suitable for forging and preparation method thereof

Abstract

The invention discloses an Al-Cu series casting alloy suitable for forging and a preparation method thereof. According to the Al-Cu series casting alloy suitable for forging and the preparation methodthereof, aiming at the problem that the Al-Cu series casting alloy with the high copper content is difficult to forge, multiple strengthening elements and inhibiting elements are added, so that a solidification temperature interval in the pouring process is shortened, a grain boundary dragging effect is increased, dendritic crystals and the like are reduced, and therefore effects of enhancing material forging performance can be achieved. The Al-Cu series casting alloy comprises the following components of, in percentage by weight, 4%-6% of Cu, 0.5%-1.0% of Mn, 0.4%-0.8% of Si, 0.3%-0.6% of Mg, 0.15%-0.4% of Ti, less than 0.5% of other impurities and the balance aluminum element. By increasing the content proportion of the Mn element in the Al-Cu series casting alloy and increasing the content of the Si element, in the solid solution aging treatment process after forging, Si phase is refined and dispersed, a large number of second-phase particles (Al2Cu and ALCuFeMn are compositely equal) are dispersed and separated out, the pinning effect is enhanced, the forging performance of the Al-Cu series casting alloy is remarkably improved, the mechanical property tensile strength after forging is larger than or equal to 500 MPa, the yield strength is larger than or equal to 350 MPa, and the elongation is larger than or equal to 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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