High-strength and high-thermal-conductivity aluminum alloy material and heat treatment process thereof

Abstract

The invention discloses a high-strength and high-thermal-conductivity aluminum alloy material and a heat treatment process thereof.The high-strength and high-thermal-conductivity aluminum alloy material comprises, by mass, 4.5%-6.5% of Si, 0.3%-0.6% of Mg, 0.7%-1.0% of Fe, 0%-0.03% of B, 0.01%-0.04% of Sr, 0%-0.02% of (Mn + Ti + V + Cr) and the balance aluminum. The strength is obviously improved during heat treatment; by adding the aluminum-boron intermediate alloy, the total amount of titanium, vanadium and chromium is effectively reduced; by adding the aluminum-strontium intermediate alloy, the silicon phase is changed, the modification effect is achieved, and meanwhile the conductivity is increased; by means of the iron additive with the content of 75%, the mucous membrane performance of the high-heat-conduction aluminum heat dissipation teeth is improved, and demolding is convenient; and through artificial aging, the strength can be improved, lattice distortion caused by rapid cooling of the die casting can be eliminated, and therefore the heat conductivity is improved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy material processing, in particular to a high-strength and high-thermal-conductivity aluminum alloy material and a heat treatment process thereof. Background technique [0002] The existing high thermal conductivity aluminum generally has low strength. For the commonly used aluminum silicon 6, in order to improve the thermal conductivity, the main elements are aluminum, silicon, iron, strontium, and no strengthening elements (such as magnesium, copper, etc.) are added. The post tensile strength is about 175MPa, the yield strength is about 80MPa, the Brinell hardness is about 56, and the thermal conductivity is about 150W / m.k. In order to eliminate the influence of the lattice distortion of the die casting on the thermal conductivity, and 320 degrees + 3 hours is an annealing treatment, which further reduces the strength and hardness of the casting, and is prone to serious deformation after h...

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Problems solved by technology

[0002] The existing high thermal conductivity aluminum is generally not high in strength. For the commonly used aluminum silicon 6, in order to improve the thermal conductivity, the main elements are aluminum, silicon, iron, strontium, without adding strengthening elements (such as magnesium, copper, etc.), die-casting The post tensile strength is about 175MPa, the yield strength is about 80MPa, the Brinell hardness is about 56, and the thermal conductivity is about 150W / m.k. In order to achieve a thermal conductivity above 175W / m.k, artificial aging at 320 degrees + 3 hours is generally used in the industry. In order to eliminate the influence of die-casting lattice distortion on thermal conductivity, and 320 degrees + 3 hours is an annealing treatment, which further reduces the strength and hardness of castings, and is prone to serious deformation after heat treatment. If machining is performed after heat treatment, the size is even more unacceptable Guaranteed, even the position of the screw must be pre-embedded with brass nuts during die-casting, which increases the cost of the enterprise. From the perspective of aluminum-silicon 8, the content of silicon and magnesium is higher than that of aluminum-silicon 6, and its strength is also higher than that of aluminum-silicon 6. , but the thermal conductivity is lower than that of Al-Si 6, which is difficult to apply in the field of high thermal conductivity. The die-casting industry urgently needs a high thermal conductivity and high strength (compared to high thermal conductivity materials), and its mechanical properties are similar to adc12 (yield strength ≥ 154MPa ) material and heat treatment process

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