Alloying and heat treatment method for improving plasticity of cast aluminum-copper alloy at room temperature
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A heat treatment method and technology for aluminum-copper alloys are applied in the field of alloying and heat treatment to improve the room temperature plasticity of cast aluminum-copper alloys, which can solve the problem that the room temperature plasticity cannot meet the requirements of orthopedic treatment, and ensure the manufacturability and high-temperature service safety. Good room temperature plasticity and the effect of increasing the free path of dislocation motion
Active Publication Date: 2021-11-23
CENT SOUTH UNIV +1
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Problems solved by technology
Compared with ZL206, ZL207 and ZL208, the performance of these two technologies has been greatly improved, but the improvement of plasticity at room temperature cannot meet the requirements of orthopedic treatment after solution quenching of castings.
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Embodiment 1
[0036] The alloy composition is: 7.50% Cu, 0.26% Mg, 1.30% Ag, 0.35% Mn, 0.25% Ti, 0.25% V, 0.25% Cd, 0.05% Ce, 0.003% Be, 0.02% Fe, 0.02% Si, the balance Al, and the sum of each component is 100%.
[0037] The alloy is firstly subjected to solution heat treatment at 520°C / 16h, then subjected to natural aging for 18h, and finally artificially aged at 160°C / 13h. The room temperature and high temperature tensile properties of the alloy are shown in Table 1.
Embodiment 2
[0039] The alloy composition is: 7.0% Cu, 0.18% Mg, 1.20% Ag, 0.45% Mn, 0.20% Ti, 0.18% V, 0.15% Cd, 0.05% Ce, 0.003% Be, 0.04% Fe, 0.05% Si, the balance Al, and the sum of each component is 100%.
[0040] The alloy is firstly subjected to solution heat treatment at 490°C / 24h, then to natural aging for 4h, and finally to artificial aging heat treatment at 185°C / 8h. The room temperature and high temperature tensile properties of the alloy are shown in Table 1.
Embodiment 3
[0042] The alloy composition is: 6.90% Cu, 0.14% Mg, 1.00% Ag, 0.30% Mn, 0.15% Ti, 0.15% V, 0.15% Cd, 0.05% Ce, 0.003% Be, 0.02% Fe, 0.02% Si, the balance Al, and the sum of each component is 100%.
[0043] The alloy is firstly subjected to solution heat treatment at 540°C / 8h, then to natural aging for 24h, and finally to artificial aging heat treatment at 190°C / 5h. The room temperature and high temperature tensile properties of the alloy are shown in Table 1.
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Abstract
The invention discloses an alloying and heat treatment method for improving room-temperature plasticity of cast aluminum-copper alloys. Ag and Cd elements are added at the same time to form Ag-Cd particles after aging, which can be cut by dislocations during the deformation process and improve dislocations. The free path of motion improves the plasticity of the alloy at room temperature. The addition of Cd element can not only refine the θ′ phase in the alloy grain, but also make the θ′ phase that was bypassed by dislocations can be cut through, greatly improving the free path of dislocation movement, and also significantly promoting the high-Cu aluminum alloy. The non-network discontinuous distribution of the grain boundary equilibrium phase θ reduces the brittleness of the alloy, which can improve the room temperature plasticity of the alloy. The Ag-Cd particles and the dispersed and precipitated θ′ phase can make up for the strength loss caused by the reduction of the Ω phase, improve the strength and toughness of the alloy, and greatly improve the processability of alloy casting and the service safety of castings. The introduction of natural aging after solid solution can promote the formation of GP regions, increase the number density of θ′ phases that are coherent with the matrix and can be cut by dislocations, and the free path of dislocation movement, thereby improving the plasticity of the alloy at room temperature.
Description
technical field [0001] The invention relates to the field of non-ferrous metal materials, in particular to an alloying and heat treatment method for improving room-temperature plasticity of cast aluminum-copper alloys. Background technique [0002] As a widely used metal material, cast aluminum alloy has the characteristics of low specific gravity, high specific strength, short preparation process and low cost, and is widely used in aviation, aerospace, automobile and other industries. In terms of aerospace equipment, cast aluminum alloys require not only high high-temperature strength to ensure excellent service performance of equipment components, but also good room temperature plasticity to ensure that the alloy has good processing technology and components can be processed smoothly. [0003] The current Al-Cu based cast aluminum alloys are divided into two categories. One type is an alloy with high room temperature strength and plasticity, but its high temperature perfo...
Claims
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