High-strength die-casting aluminum alloy material for mobile phone middle plate and preparation method of high-strength die-casting aluminum alloy material

Abstract

The invention relates to a high-strength die-casting aluminum alloy material for a mobile phone middle plate and a preparation method of the high-strength die-casting aluminum alloy material. An alloycomprises, by weight, 6%-8% of Si, 1.5%-3.0% of Mg, 0.2%-1.8% of Mn, less than 2.5% of Cu, less than 0.5% of Fe, 0.01%-0.2% of Ti, 0.005%-0.1% of Sr, less than 1.0% of Zn, less than 0.8% of Y, less than 0.5% of Ce and the balance Al, wherein the weight percentage sum of remaining impurities is controlled to be less than 1.0%. Compared with the prior art, according to the high-strength die-castingaluminum alloy material and the preparation method thereof, the elements of Si, Mn, Cu and Mg are added to the aluminum alloy, three strengthening phases, namely Mg2Si, MnAl6 and Al2Cu, and a binaryprecipitated phase are introduced, and the yield strength of the material is remarkably improved; meanwhile, the elements Y and Ce are doped into the aluminum alloy, and the elongation of the die-casting alloy is increased; meanwhile, stable hydride can be formed, the hydrogen fixation effect is achieved, the hydrogen content of a substrate of the aluminum alloy is decreased, and the pinhole degree of the substrate of the aluminum alloy is lowered; and elongation of the die-casting alloy is further increased.

Description

technical field [0001] The invention belongs to the field of aluminum alloys, and relates to a preparation method of a high-strength die-casting aluminum alloy material for a middle plate of a mobile phone. Background technique [0002] With the advent of the 5G era, smartphones are being updated at an accelerated pace, and their requirements for mobile phone mid-boards are changing day by day. In the 5G era, antenna design is the biggest challenge. Generally speaking, the antenna in the mobile phone radiates 360° in all directions, so it is necessary to avoid metal in a certain range near it. This range is the "clearance area". 5G is divided into two frequency bands, low frequency and high frequency. The low-frequency frequency band is 3-5Ghz, which is similar to the current 4G frequency band, and the antenna can continue to use the current design. However, in order to meet the transmission rate requirements of 5G, the number of antennas must be increased. Therefore, th...

AI Technical Summary

Problems solved by technology

In the 5G era, antenna design is the biggest challenge

Such yield strength and elongation can no longer meet the requirements of mid-plate materials for mobile phones in the 5G era

[0004] Patent application CN108754250A discloses a high-strength die-casting aluminum alloy and its manufacturing method. The yield strength of the alloy reaches 250-270 MPa and the elongation is 2-3%. Large, affecting the fluidity of molten aluminum, its yield strength and fluidity are more suitable for die-casting mobile phone middle plates with wall thickness greater than 0.5mm

Images