High-strength duralumin alloy applied to mobile phone shell and preparation method of high-strength duralumin alloy

A technology of hard aluminum alloy and mobile phone case, applied in the field of metal materials, can solve problems such as low strength, streak structure or uneven color, achieve good elongation, inhibit recrystallization, improve mechanical properties and process plasticity.

Active Publication Date: 2018-04-20
中铝东南材料院(福建)科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the defects such as the low strength of Al-Mg-Si-Cu aluminum alloys and the stripe structure or uneven col

Method used

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  • High-strength duralumin alloy applied to mobile phone shell and preparation method of high-strength duralumin alloy
  • High-strength duralumin alloy applied to mobile phone shell and preparation method of high-strength duralumin alloy
  • High-strength duralumin alloy applied to mobile phone shell and preparation method of high-strength duralumin alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A high-strength and hard aluminum alloy used for mobile phone cases. The chemical composition (mass%) of the high-strength and hard aluminum alloy used is Zn: 6.35%, Mg: 1.94%, Mn: 0.05%, Cu: 1.15%, Zr: 0.08%, Cr: 0.03%, Ti: 0.02%, and the rest are Al and other unavoidable impurities.

[0027] Its preparation method comprises the following process steps:

[0028] (1) The crucible is placed in an intermediate frequency furnace and heated to 650°C, and the preheated Zn, Cu, Al-Mn, Al-Cr, Al-Zr, Al-Ti alloys are added;

[0029] (2) Raise the crucible to 740°C, add the preheated Mg alloy into the molten aluminum alloy melt until the Mg alloy is completely melted in the melt, and stir evenly;

[0030] (3) Lower the crucible to 720°C, keep it warm for 20 minutes, degas and remove slag with pretreated hexachloroethane, and pour it into a copper metal mold with a cooling device;

[0031] (4) Ingot homogenization process: primary homogenization temperature 420°C, time 8h, seco...

Embodiment 2

[0038] A high-strength and hard aluminum alloy used for mobile phone cases. The chemical composition (mass%) of the high-strength and hard aluminum alloy used is Zn: 5.89%, Mg: 1.81%, Mn: 0.10%, Cu: 2.00%, Zr: 0.01%, Cr: 0.01%, Ti: 0.04%, and the rest are Al and other unavoidable impurities.

[0039] Its preparation method comprises the following process steps:

[0040] (1) The crucible is placed in an intermediate frequency furnace and heated to 650°C, and the preheated Zn, Cu, Al-Mn, Al-Cr, Al-Zr, Al-Ti alloys are added;

[0041] (2) Raise the crucible to 740°C, add the preheated Mg alloy into the molten aluminum alloy melt until the Mg alloy is completely melted in the melt, and stir evenly;

[0042] (3) Lower the crucible to 720°C, keep it warm for 20 minutes, degas and remove slag with pretreated hexachloroethane, and pour it into a copper metal mold with a cooling device;

[0043] (4) Ingot homogenization process: primary homogenization temperature 410°C for 10 hours, ...

Embodiment 3

[0050] A high-strength and hard aluminum alloy used for mobile phone cases. The chemical composition (mass%) of the high-strength and hard aluminum alloy used is Zn: 6.85%, Mg: 2.15%, Mn: 0.10%, Cu: 1.30%, Zr: 0.05%, Cr: 0.02%, Ti: 0.02%, and the rest are Al and other unavoidable impurities.

[0051] Its preparation method comprises the following process steps:

[0052] (1) The crucible is placed in an intermediate frequency furnace and heated to 650°C, and the preheated Zn, Cu, Al-Mn, Al-Si, Al-Zr, Al-Ti alloys are added;

[0053] (2) Raise the crucible to 740°C, add the preheated Mg alloy into the molten aluminum alloy melt until the Mg alloy is completely melted in the melt, and stir evenly;

[0054] (3) Lower the crucible to 720°C, keep it warm for 20 minutes, degas and remove slag with pretreated hexachloroethane, and pour it into a copper metal mold with a cooling device;

[0055] (4) Ingot homogenization process: primary homogenization temperature 420°C for 10 hours, ...

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Abstract

The invention provides high-strength duralumin alloy applied to a mobile phone shell and a preparation method of the high-strength duralumin alloy. The used high-strength duralumin alloy comprises thefollowing components in percentage by mass: 5.00 to 10.00 percent of Zn, 1.20 to 6.00 percent of Mg, 0.03 to 0.50 percent of Mn, 0.03 to 4.00 percent of Cu, 0.01 to 0.25 percent of Zr, 0.01 to 0.30 percent of Cr, 0.01 to 0.20 percent of Ti and the balance of Al and other inevitable impurities. After thermal treatment, a plate made from the high-strength duralumin alloy provided by the invention has excellent comprehensive performances, namely the tensile strength is 400 MPa to 500 MPa, the yield strength is 380 MPa to 480 Mpa, the percent elongation is 11% to 18%, the conductivity is 25% to 44% IACS, and the rigidity is 175 HV to 220 HV.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a high-strength aluminum alloy used for a mobile phone case and a preparation method thereof. Background technique [0002] With the advancement of science and technology, mobile phones have become an inseparable communication tool for people, and the materials of mobile phone cases are also varied. Early mobile phone shell materials were mostly engineering plastics (PC+ABS), which were gradually eliminated due to their shortcomings such as heavy weight, inability to shield electromagnetic signals, low strength, and poor thermal conductivity. Therefore, metal mobile phone casings have become the innovation focus of many mobile phone manufacturers in consumer electronics. At present, many mobile phone manufacturers use metal shells. For example, in the smart phones produced by the world's three major mobile phone manufacturers (Apple, Samsung, Huawei), the mob...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22F1/053C22C1/03
Inventor 何立子付海朋江钟宇黄瑞银刘旺方小明
Owner 中铝东南材料院(福建)科技有限公司
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