CN114262824A - Medium-strength die-casting alloy material for middle plate of 5G mobile phone and preparation method thereof - Google Patents
Medium-strength die-casting alloy material for middle plate of 5G mobile phone and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a medium-strength die-casting alloy material for a 5G mobile phone middle plate and a preparation method thereof, wherein the alloy material comprises Si: 9-10 wt%, Mg: 0.6 wt% -1.1 wt%, Mn: 0.2 wt% -1.0 wt%, Cu<1.0％，Fe<0.7wt％，Ti：0.01wt％‑0.15wt％，Sr：0.005wt％‑0.1wt％，Zn<1.0wt％，Mo<0.2 wt%, the sum of the weight percentages of the other impurities is controlled below 1.0 wt%, and the balance is Al. Compared with the prior art, the invention introduces three strengthening phases of Mg by adding Si, Mn, Cu and Mg into the aluminum alloy2Si、MnAl6And Al2The Cu binary precipitated phase obviously improves the yield strength of the material, and simultaneously, Mo element is doped into the aluminum alloy, and is dissolved into Chinese character-shaped Al-Si-Mn-Fe phase and needle-shaped Al-Si-Fe, so that the Mo element is converted into fine and dispersedly distributed granular Al-Si-Mn-Fe-Mo and Al-Si-Fe-Mo multi-component phases to block the movement of dislocation,has certain pinning strengthening effect on the alloy matrix, thereby improving the mechanical property of the alloy.
Description
Technical Field
The invention relates to an aluminum alloy, in particular to a medium-strength die-casting alloy material for a 5G mobile phone middle plate and a preparation method thereof.
Background
4G changes life, and 5G changes society. The 5G is the next generation (fifth generation) mobile communication, which can provide faster uploading and downloading speed, wider coverage and more stable connection. Compared with the 4G, the 5G has the technical characteristics of ultra-high speed, ultra-low time delay and ultra-large connection, not only can the network experience of a user be further improved, but also the application requirement of future interconnection of everything can be met while the faster transmission speed is brought to the mobile terminal, and the online connection capability of everything is given.
The 5G handset, which is the most important terminal of 5G, does not have a chip to integrate the computation and the 5G baseband. This means that the handset will have one more baseband chip, which takes up a lot of space. The most advanced way is that 5G is realized by matching a barton 5000 baseband with an own kylin 980. The same is true for other manufacturers, and the 5G baseband is basically arranged outside. In addition, the antenna of the 5G mobile phone is more complex, 2G, 3G, 4G, 5G, NFC, Bluetooth and wifi are supported, the number of the antennas is multiple, and the use shielding is prevented. Certainly, to implement dual-card dual-standby dual-pass, more and more complicated antenna designs are required, and the antenna occupies more positions. The iPhone XS is the problem of current break and poor signal when dual card dual standby occurs because the antenna is not well processed. Another important reason is that the battery is larger. 5G mobile phones consume more power than 4G mobile phones, consume more power, and need to be large batteries. The larger the battery capacity, the larger the volume of the battery at the same level. This range of specifications results in a 5G handset that is thicker and heavier.
The 4G mobile phone middle plate is generally made of die-casting aluminum alloy ADC12, has excellent casting performance such as low shrinkage rate, good fluidity and small hot cracking tendency, and is one of alloy series with the largest consumption in casting aluminum alloy. The yield strength is 160-180 MPa, and the elongation is 1.5%. The yield strength and the elongation rate can not meet the design requirements of the 5G era that the mobile phone middle plate material is complex in structure and thin (0.3-0.6mm) in thickness. Meanwhile, with the use and the size of the OLED full screen becoming larger and larger, the requirement on the flatness of the middle plate becomes higher and higher. The use performance of the mobile phone middle plate requires that the material has higher yield strength and elongation rate so as to ensure the strength required by the supporting circuit board, the screen and the mobile phone structure.
Therefore, a die-casting aluminum alloy with good fluidity and excellent die-casting performance and medium yield strength and elongation (yield strength 200-, affecting the elongation of the diecast material. Therefore, a medium-strength die-casting alloy material suitable for the thin-wall mobile phone middle plate is urgently needed to be developed, and the influence of the improvement of the Fe content on the material performance is reduced, so that the 5G mobile phone middle plate can be rapidly produced and manufactured.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a medium-strength die-casting alloy material for a 5G mobile phone middle plate, which can be used for a 5G mobile phone middle plate with low cost and high raw material utilization rate and can be used for coping with a complex structure in the 5G mobile phone, and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme: the medium-strength die-casting alloy material for the middle plate of the 5G mobile phone is characterized by comprising the following components in percentage by weight: 9-10 wt%, Mg: 0.6 wt% -1.1 wt%, Mn: 0.2 wt% -1.0 wt%, Cu <1.0 wt%, Fe <0.7 wt%, Ti: 0.01 wt% -0.15 wt%, Sr: 0.005 wt% -0.1 wt%, Zn <1.0 wt%, Mo <0.2 wt%, the sum of the weight percentages of the other impurities is controlled below 1.0 wt%, and the balance is Al.
The Si, Mg, Mn, Fe and Cu are added in a simple substance form, wherein the simple substances of the Si, the Mg, the Mn, the Fe and the Cu are preprocessed into cubes with the side length of 10cm and then put into the aluminum liquid.
The Mo, Ti and Sr are added in the form of intermediate phase alloy, Al-Mo, Al-Ti and Al-Sr intermediate alloy is adopted, and the intermediate alloy is intermediate alloy nano powder with the average particle size of 30-50 nm.
The master alloy nanometer powder is obtained by the following method: taking Al-Mo, Al-Ti and Al-Sr intermediate alloys as anodes and a tungsten rod as a cathode, and reducing the pressure to 5 x 10 in a direct current arc plasma reaction chamber-2Pa, regulating current and distance between cathode and anode in hydrogen atmosphere to generate stable arcEvaporating the anode at high temperature, condensing and collecting to obtain Al-Mo, Al-Ti and Al-Sr intermediate alloy nano powder.
The hydrogen atmosphere is Ar and H2In which H is2The volume percentage of (A) is 30-50%.
The current is 50-100A, and the distance between the cathode and the anode is less than 2 mm.
The invention prepares Al-Mo, Al-Ti and Al-Sr intermediate alloy nano powder by a direct current arc plasma method, the basic principle of the direct current arc plasma method is that various atoms in an arc column are firstly ionized by utilizing the high temperature of an electric arc, on one hand, the generated heat causes direct thermal evaporation of metal, and more importantly, metal nano particles are prepared by a series of basic processes of metal atom evaporation, gas phase particle nucleation, crystal nucleus growth, condensation and the like under the action of plasmas of different active gases such as hydrogen and the like, and the average particle size is 30-50 nm. Mo, Ti and Sr can be distributed in the aluminum alloy more uniformly and dispersedly, and the modification and refinement effects are exerted more fully. Mo element is dissolved in Chinese character-shaped Al-Si-Mn-Fe phase, so that the Mo element is converted into fine and dispersedly distributed granular Al-Si-Cr-Mn-Fe-Mo multi-component phase, the movement of dislocation is hindered, and a certain pinning strengthening effect is provided for an alloy matrix, thereby improving the mechanical property of the alloy.
A preparation method of a medium-strength die-casting alloy material for a 5G mobile phone middle plate comprises the following steps:
1) putting high-purity aluminum element into a heating furnace, heating to 600 ℃, completely melting and preserving heat for 15 min;
2) heating to 780 ℃, and adding Si, Mn, Fe and Cu elementary substance elements;
3) heating to 750 ℃, and adding Mo, Ti and Sr intermediate phase alloy nano powder;
4) heating to 750 ℃, and adding pure Mg metal material;
5) and after the raw materials are completely melted, casting to obtain the aluminum alloy casting.
And (5) melting the aluminum alloy casting obtained in the step (5) again at 750 ℃, preserving heat, introducing nitrogen to isolate the nitrogen from air during heat preservation, then injecting a die-casting die, and carrying out die pressing to obtain the mobile phone middle plate.
The die-casting die is a die temperature machine, the temperature is kept at 250-350 ℃ in advance, the injection speed is 4m/s, and the molten aluminum alloy casting is rapidly cooled and formed under the pressure of 20-40 MPa.
The yield strength of the middle plate in the mobile phone reaches 200-240MPa, and the elongation is 2-4%.
Compared with the prior art, the invention has the following beneficial effects:
1) after the aluminum alloy casting is obtained by die pressing, the mobile phone middle plate only accounts for 20-30% of the whole die-casting blank, and the stub bar, the runner, the exhaust and the slag ladle account for 70-80% of the mass of the die-casting blank, and can be directly remelted and then made into an aluminum ingot for reuse, and other aluminum alloy materials can introduce Fe elements into the stub bar, the runner, the exhaust and the slag ladle due to the punch lubricating granular oil used in the die-casting process, so that the Fe content in the remelted aluminum ingot is increased, Chinese character-shaped Al-Si-Mn-Fe phases and needle-shaped Al-Si-Fe phases are formed, and the elongation of the die-casting material is influenced. The invention adopts a direct current arc plasma method to prepare Al-Mo, Al-Ti and Al-Sr intermediate alloy nano powder as raw materials, Mo element of the prepared aluminum alloy casting is dissolved into Chinese character-shaped Al-Si-Mn-Fe phase and needle-shaped Al-Si-Fe phase, so that the Mo element of the aluminum alloy casting is converted into fine and dispersedly distributed granular Al-Si-Mn-Fe-Mo and Al-Si-Fe-Mo multi-component phase, the movement of dislocation is blocked, and a certain pinning strengthening effect is provided for the alloy matrix, therefore, the Fe element is not caused to be aggregated to form needle-shaped phase, the yield strength of the aluminum alloy die casting prepared by recovering the die casting blank can be maintained at 200-240MPa, and the elongation is maintained at 2-4%.
2) Adding Si, Mn, Fe, Cu to the aluminum alloy to form a strengthening phase Mg2Si、MnAl6、Al3Fe、Al2And Cu, which obviously improves the yield strength of the material. By MnAl6The compound dispersoid acts as a barrier to the growth of recrystallized grains, increases the recrystallization temperature, can obviously refine the recrystallized grains, and simultaneously, MnAl6Can dissolve impurity iron to form (Fe, Mn) Al6The harmful effect of iron is reduced, and the elongation of Al-Si-Mg is improved.
3) Height ofExcessive and coarse Al is easily generated in the aluminum alloy with Si and Mg contents8Mg5、Mg2The coarse Si phase and the lamellar eutectic Si phase are unevenly distributed, and the aluminum matrix is cracked, so that the elongation is reduced. Sr is by Al8Mg5、Mg2The coarse Si phase and the eutectic Si phase provide heterogeneous nucleation and segregate to Al8Mg5、Mg2Si and eutectic Si interface prevents further growth of Al8Mg5、Mg2The coarse phase and the eutectic phase of Si are transformed into round, broken blocks and spheres, and are distributed in the aluminum matrix more uniformly, so that the aluminum matrix is reduced from cracking, and the elongation of the aluminum matrix is effectively improved.
4) According to the invention, by controlling the composition and the adding sequence of the alloy, the elemental elements of Si, Mg, Mn, Fe and Cu are added in the forming process of the alloy, and then Mo, Ti and Sr intermediate phase alloy nano powder is added to form the complex phase reinforced material with the yield strength of 200-240MPa and the elongation of 2-4%, so that the complex phase reinforced material is suitable for a mobile phone middle plate with the wall thickness of less than 0.5mm, and has good fluidity and excellent die casting performance.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Examples 1 to 8:
a low-cost, medium-yield-strength and elongation die-cast aluminum alloy material comprises the following components in percentage by mass as shown in the following table 1, and the balance of aluminum and inevitable impurities.
The alloy material comprises Si: 9-10 wt%; mg: 0.6 wt% -1.1 wt%; mn: 0.2 wt% -1.0 wt%; cu < 1.0%; fe <0.7 wt%; ti: 0.01 wt% -0.15 wt%; sr: 0.005-0.1 wt%; zn <0.5 wt%; mo <0.2 wt%; the sum of the weight percentages of the other impurities is controlled to be less than 1.0wt percent, and the balance is Al.
Table 1 shows the contents of the elements in the aluminum alloys of examples 1 to 8 and the performance of the cell phone middle plate made therefrom
The preparation method of the aluminum alloy in each embodiment comprises the following steps:
1) calculating the mass of the needed intermediate alloy, and preparing materials;
2) putting high-purity aluminum element into a heating furnace, heating to 600 ℃, completely melting and preserving heat for 15 min;
3) heating to 780 ℃, adding Si, Mg, Mn, Fe and Cu in a simple substance form, preprocessing the simple substances of Si, Mg, Mn, Fe and Cu into a cube with the side length of 10cm, and then putting into the aluminum liquid.
4) Heating to 750 ℃, adding Mo, Ti and Sr intermediate phase alloy nano powder, and preparing Al-Mo, Al-Ti and Al-Sr intermediate alloy nano powder by adopting a direct current arc plasma method. Is beneficial to the rapid and uniform melting of the material.
5) Heating to 720 ℃, and adding pure Mg metal material;
6) after the raw materials are completely melted, casting to obtain an aluminum alloy casting;
7) melting the obtained aluminum alloy casting again at 750 ℃ and preserving heat, wherein the material during heat preservation needs to be isolated from air, nitrogen is introduced to isolate from air during general heat preservation, then the aluminum alloy casting is injected into a die-casting die, and the mobile phone middle plate is obtained through die pressing. The die-casting die is a die temperature machine, the temperature is kept at 350 ℃ in advance, the injection speed is 4m/s, the molten aluminum alloy casting is rapidly cooled and formed to prepare a mobile phone middle plate with the wall thickness of 0.3mm, a stretching sheet is subjected to in-situ linear cutting on the mobile phone middle plate, a stretching sheet sample is subjected to tensile property (yield strength and elongation) test by adopting an electronic universal testing machine with the model of CMT5105 according to GBT 228.1-2010, wherein the gauge length is 20mm, and the loading rate is 2 mm/min. The yield strength is measured to be 200-240MPa, and the elongation is 2-4%.
8) And (3) recycling the residual aluminum alloy leftover materials of the mobile phone middle plate obtained by die pressing, heating to 780 ℃, refining, stirring, degassing, standing for 30min, die-casting, obtaining the mobile phone middle plate by die pressing of the obtained die-casting piece according to the step (7), and performing performance test.
After the mobile phone middle plate is molded by the aluminum alloy casting obtained in the embodiments 1 to 8, the obtained scrap materials are recast according to the step 8, and the mobile phone middle plate obtained by recasting has the following properties:
it can be seen that the properties after remelting are slightly reduced compared to before remelting, but are substantially unchanged, remaining at a level, in particular the elongation.
It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the invention, and not all of them. Obviously, all other embodiments obtained by persons of ordinary skill in the art based on the above-mentioned embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
Claims (10)
1. The medium-strength die-casting alloy material for the middle plate of the 5G mobile phone is characterized by comprising the following components in percentage by weight: 9-10 wt%, Mg: 0.6 wt% -1.1 wt%, Mn: 0.2 wt% -1.0 wt%, Cu <1.0 wt%, Fe <0.7 wt%, Ti: 0.01 wt% -0.15 wt%, Sr: 0.005 wt% -0.1 wt%, Zn <1.0 wt%, Mo <0.2 wt%, the sum of the weight percentages of the other impurities is controlled below 1.0 wt%, and the balance is Al.
2. The medium-strength die-casting alloy material for the middle plate of the 5G mobile phone, as recited in claim 1, wherein the Si, Mg, Mn, Fe and Cu are added in the form of simple substances, and the simple substances of Si, Mg, Mn, Fe and Cu are preprocessed into cubes with the side length of 10cm and then put into the molten aluminum.
3. The medium strength die-casting alloy material for the middle plate of the 5G mobile phone as claimed in claim 1, wherein Mo, Ti and Sr are added in the form of intermediate phase alloy, Al-Mo, Al-Ti and Al-Sr intermediate alloy is adopted, and the intermediate alloy is intermediate alloy nano powder with the average particle size of 30-50 nm.
4. The medium-strength die-casting alloy material for the middle plate of the 5G mobile phone as claimed in claim 3, wherein the master alloy nano powder is obtained by the following method: taking Al-Mo, Al-Ti and Al-Sr intermediate alloys as anodes and a tungsten rod as a cathode, and reducing the pressure to 5 x 10 in a direct current arc plasma reaction chamber-2Pa, regulating the current and the distance between the cathode and the anode in the hydrogen atmosphere to generate stable electric arc, evaporating and condensing the anode at the high temperature generated by the electric arc, and collecting to obtain Al-Mo, Al-Ti and Al-Sr intermediate alloy nano powder.
5. The medium-strength die-casting alloy material for the middle plate of a 5G mobile phone as claimed in claim 4, wherein the hydrogen atmosphere is Ar and H2In which H is2The volume percentage of (A) is 30-50%.
6. The moderate strength die-casting alloy material for the middle plate of the 5G mobile phone as claimed in claim 4, wherein the current is 50-100A, and the distance between the cathode and the anode is less than 2 mm.
7. A preparation method of the medium-strength die-casting alloy material for the middle plate of the 5G mobile phone according to claims 1-6 is characterized by comprising the following steps:
1) putting high-purity aluminum element into a heating furnace, heating to 600 ℃, completely melting and preserving heat for 15 min;
2) heating to 780 ℃, and adding Si, Mn, Fe and Cu elementary substance elements;
3) heating to 750 ℃, and adding Mo, Ti and Sr intermediate phase alloy nano powder;
4) heating to 750 ℃, and adding pure Mg metal material;
5) and after the raw materials are completely melted, casting to obtain the aluminum alloy casting.
8. The preparation method of the medium-strength die-casting alloy material for the middle plate of the 5G mobile phone according to claim 7, wherein the aluminum alloy casting obtained in the step (5) is melted again at 750 ℃ and is subjected to heat preservation, nitrogen is introduced during heat preservation to isolate the nitrogen from air, then a die-casting die is injected, and the mobile phone middle plate is obtained through die pressing.
9. The method for preparing the medium-strength die-casting alloy material for the middle plate of the 5G mobile phone according to claim 8, wherein the die-casting mold is a mold temperature machine, the temperature is kept at 250-350 ℃ in advance, the injection speed is 4m/s, and the molten aluminum alloy casting is rapidly cooled and formed under the pressure of 20-40 MPa.
10. The method for preparing the medium-strength die-casting alloy material for the middle plate of the 5G mobile phone as claimed in claim 8, wherein the yield strength of the middle plate of the mobile phone reaches 200-240MPa, and the elongation is 2-4%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114774740A (en) * | 2022-06-22 | 2022-07-22 | 上海嘉朗实业南通智能科技有限公司 | High-strength high-plasticity die-casting aluminum alloy material and preparation method thereof |
| CN117821813A (en) * | 2024-03-04 | 2024-04-05 | 鸿劲新材料研究(南通)有限公司 | Aluminum alloy material for auxiliary frame of automobile and preparation method |
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| CN117821813B (en) * | 2024-03-04 | 2024-04-26 | 鸿劲新材料研究(南通)有限公司 | Aluminum alloy material for auxiliary frame of automobile and preparation method |
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