Die casting aluminum alloy, production method of die casting aluminum alloy, and communications product

Abstract

Embodiments of the present disclosure provide a die casting aluminum alloy, including constituents with the following mass percentages: silicon: 4.0% to 10.0%; magnesium: 0.2% to 1.0%; copper: ≤0.1%; manganese: ≤0.1%; zinc: ≤0.1%; ferrum: ≤1.3%; titanium: ≤0.2%; inevitable impurities: ≤0.15%; and the rest: aluminum. The die casting aluminum alloy has a high heat-conducting property, good formability, high corrosion resistance, and a good mechanical property. This can resolve a prior-art problem that forming and heat dissipation requirements of a communications product with a complex structure, high heat flux density, and large power cannot be met at the same time because it is difficult for a die casting aluminum alloy to have both a high heat-conducting property and good formability. The embodiments of the present disclosure further provide a production method of the die casting aluminum alloy and a communications product.

What is claimed is: 
     
         1 . A die casting aluminum alloy, consisting of constituents with the following mass percentages:
 silicon: 4.0% to 10.0%;   magnesium: 0.2% to 1.0%;   copper: ≤0.1%;   manganese: ≤0.1%;   zinc: ≤0.1%;   ferrum: ≤1.3%;   titanium: ≤0.2%;   impurities: ≤0.15%; and   remainder: aluminum.   
     
     
         2 . The die casting aluminum alloy according to  claim 1 , wherein a mass percentage of the silicon is 5.5% to 6.5%. 
     
     
         3 . The die casting aluminum alloy according to  claim 2 , wherein the mass percentage of the silicon is 5.8% to 6.3%. 
     
     
         4 . The die casting aluminum alloy according to  claim 2 , wherein the mass percentage of the silicon is 5.7%. 
     
     
         5 . The die casting aluminum alloy according to  claim 1 , wherein a mass percentage of the silicon is 4.3% to 5.0%. 
     
     
         6 . The die casting aluminum alloy according to  claim 5 , wherein the mass percentage of the silicon is 4.4% to 4.8%. 
     
     
         7 . The die casting aluminum alloy according to  claim 1 , wherein a mass percentage of the silicon is 6.5% to 7.5%. 
     
     
         8 . The die casting aluminum alloy according to  claim 1 , wherein a mass percentage of the magnesium is 0.3% to 0.8%. 
     
     
         9 . The die casting aluminum alloy according to  claim 8 , wherein the mass percentage of the magnesium is 0.4% to 0.7%. 
     
     
         10 . The die casting aluminum alloy according to  claim 9 , wherein the mass percentage of the magnesium is 0.5% to 0.6%. 
     
     
         11 . The die casting aluminum alloy according to  claim 1 , wherein a mass percentage of the copper is 0.001% to 0.05%. 
     
     
         12 . The die casting aluminum alloy according to  claim 11 , wherein the mass percentage of the copper is 0.01% to 0.03%. 
     
     
         13 . The die casting aluminum alloy according to  claim 1 , wherein a mass percentage of the manganese is 0.001% to 0.006%. 
     
     
         14 . The die casting aluminum alloy according to  claim 13 , wherein the mass percentage of the manganese is 0.002% to 0.004%. 
     
     
         15 . The die casting aluminum alloy according to  claim 1 , wherein a mass percentage of the zinc is 0.001% to 0.02%. 
     
     
         16 . The die casting aluminum alloy according to  claim 15 , wherein the mass percentage of the zinc is 0.001% to 0.008%. 
     
     
         17 . The die casting aluminum alloy according to  claim 1 , wherein a mass percentage of the ferrum is 0.3% to 1.0%. 
     
     
         18 . The die casting aluminum alloy according to  claim 17 , wherein the mass percentage of the ferrum is 0.5% to 0.7%. 
     
     
         19 . The die casting aluminum alloy according to  claim 1 , wherein a mass percentage of the titanium is 0.001% to 0.06%. 
     
     
         20 . The die casting aluminum alloy according to  claim 19 , wherein the mass percentage of the titanium is 0.01% to 0.03%. 
     
     
         21 . The die casting aluminum alloy according to  claim 1 , wherein a total mass percentage of elements other than the aluminum in the die casting aluminum alloy is less than 10%. 
     
     
         22 . The die casting aluminum alloy according to  claim 21 , wherein the total mass percentage of the elements other than the aluminum in the die casting aluminum alloy is 5.0% to 8.0%. 
     
     
         23 . The die casting aluminum alloy according to  claim 1 ,
 wherein phases inside an organization structure of the die casting aluminum alloy comprise a hypoeutectic α-Al phase, a eutectic α-Al phase, a eutectic Si phase, and an intermetallic compound,   wherein the intermetallic compound is distributed at a grain boundary location or is precipitated in the hypoeutectic α-Al phase and the eutectic α-Al phase, and   wherein the intermetallic compound comprises an Mg 2 Si phase.   
     
     
         24 . The die casting aluminum alloy according to  claim 1 , wherein a coefficient of thermal conductivity of the die casting aluminum alloy is 170 W/(m·K) to 195 W/(m·K). 
     
     
         25 . The die casting aluminum alloy according to  claim 1 , wherein a Brinell hardness of the die casting aluminum alloy is 60 HBW to 80 HBW, a tensile strength of the die casting aluminum alloy is 170 MPa to 220 MPa, a yield strength of the die casting aluminum alloy is greater than or equal to 100 MPa, and an elongation rate of the die casting aluminum alloy is greater than or equal to 2%. 
     
     
         26 . A method for producing a die casting aluminum alloy, the method comprising:
 providing raw materials based on constituents of a die casting aluminum alloy, and   performing heat treatment at any temperature within 180° C. to 375° C. after casting, to obtain a die casting aluminum alloy, the die casting aluminum alloy consisting of constituents with the following mass percentages:   silicon: 4.0% to 10.0%;   magnesium: 0.2% to 1.0%;   copper: ≤0.1%;   manganese: ≤0.1%;   zinc: ≤0.1%;   ferrum: ≤1.3%;   titanium: ≤0.2%;   impurities: ≤0.15%; and   remainder: aluminum.   
     
     
         27 . The method according to  claim 26 , wherein the casting is performed through liquid die casting, semi-solid die casting, vacuum die casting, investment casting, gravity casting, or squeeze casting. 
     
     
         28 . The method according to  claim 26 , wherein a time for the heat treatment is 0.2 hours to 8 hours. 
     
     
         29 . A communications product, comprising:
 a housing; and   a power supply circuit located in the housing;   a functional circuit located in the housing, wherein the power supply circuit supplies power to the functional circuit, and the housing is obtained through casting by using a die casting aluminum alloy consisting of constituents with the following mass percentages:   silicon: 4.0% to 10.0%;   magnesium: 0.2% to 1.0%;   copper: ≤0.1%;   manganese: ≤0.1%;   zinc: ≤0.1%;   ferrum: ≤1.3%;   titanium: ≤0.2%; and   impurities: ≤0.15%; and   remainder: aluminum.