A die-casting aluminum alloy material for mobile phone middle board and preparation method thereof

Abstract

The invention provides a die-casting aluminum alloy material for a mobile phone middle plate. The aluminum alloy material includes the following components by mass percentage: Si: 9.0-13.0%, Mg: 0.6-1.5%, Mn: 0.3-0.8%, Re: 0.1 ‑1.0%, Cr: 0.01‑0.35%, Fe≤0.5%, Ti: 0.01‑0.25%, Zn: 0.5‑1.5%, Sr: 0.008‑0.06%, and the balance is aluminum. The invention adds strengthening elements Mg and Zn; adding Cr is used to control the grain structure, prevent the grain growth of the aluminum-magnesium alloy, and prevent the thermal shaping process of the aluminum-magnesium-silicon alloy or the aluminum-magnesium-zinc alloy in the process of processing the middle plate of the mobile phone Or recrystallization occurs during heat treatment, and the Cr in the solid solution is a finely dispersed phase, which can improve the structural strength and toughness; the added Ti and Sr play a role in refining the grain and modifying the quality; the composition of Si is in the eutectic range, which makes the material have excellent Excellent casting performance, Sr makes Si change from needle flakes to short rods and spheres, and the electrical and thermal conductivity are improved. When the material is used for die-casting the middle plate of a mobile phone, the yield strength is ≥250MPa, the elongation is ≥3%, and the thermal conductivity is ≥130W / (m·K).

Description

technical field [0001] The invention relates to a die-casting aluminum alloy material for a mobile phone middle plate and a preparation method thereof. Background technique [0002] The existing mobile phone middle board generally adopts ADC12 or high-strength aluminum die-casting, which has low cost, but the elongation rate is not high, the thermal conductivity is low, and the performance is not good. The thermal conductivity of ADC12 is 96W / (m·K), the thermal conductivity of high-strength aluminum is 85W / (m·K), and the elongation of both is less than 2%. [0003] The high-end mobile phone middle plate is made of deformed aluminum alloy, such as 6061, 6013, etc. Although the performance is good, it needs to be heat treated and processed by CNC, resulting in long processing cycle and high cost. With the development of 5G communication, the frequency is getting higher and higher, and the calorific value of the CPU is increasing. A low-cost, high-performance, and easy-to-cast...

AI Technical Summary

Problems solved by technology

[0003] The middle plate of high-end mobile phones is made of deformed aluminum alloy, such as 6061, 6013, etc. Although the performance is good, it needs to be heat treated and processed by CNC, resulting in long processing cycle and high cost.

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