Uses: Magnesium alloys are widely used in portable equipment and automobile industry to achieve the purpose of lightweight.
Although the specific gravity of magnesium alloy is heavier than that of plastic, the strength and elasticity per unit weight are higher than that of plastic, so magnesium alloy parts can be made thinner and lighter than plastic under the same strength. In addition, because the specific strength of magnesium alloy is higher than that of aluminum alloy and iron, the weight of aluminum or iron parts can be reduced without reducing the strength of parts.
Magnesium alloy has the highest relative specific strength (the ratio of strength to mass). The specific stiffness (the ratio of stiffness to mass) is close to that of aluminum alloy and steel, and much higher than that of engineering plastics.
In the elastic range, when magnesium alloy is subjected to impact load, the energy absorbed is half that of aluminum alloy, so magnesium alloy has good seismic and noise reduction performance.
The melting point of magnesium alloy is lower than that of aluminum alloy, and its die-casting formability is good. The tensile strength of magnesium alloy castings is equivalent to that of aluminum alloy castings, which can generally reach 250MPA and the highest can reach more than 600 Mpa. The yield strength and elongation are similar to those of aluminum alloy.
Magnesium alloy also has good corrosion resistance, electromagnetic shielding performance and radiation protection performance, and can be recycled at 100%.
Magnesium alloy parts have high stability, high precision of casting line dimensions of die-casting parts, and can be processed with high precision.
Magnesium alloy has good die casting formability, and the minimum wall thickness of die casting can reach 0.5 mm. Suitable for manufacturing all kinds of automobile die castings.
However, the linear expansion coefficient of magnesium alloy is very large, reaching 25 ~ 26 μ m/m℃, while that of aluminum alloy is 23 μ m/m℃, that of brass is about 20 μ m/m℃, that of structural steel is 12 μ m/m℃, that of cast iron is about 10 μm/ m℃, and that of rocks (granite, marble, etc. ) is only 5 ~ 9 microns/meter.
Magnesium alloy is an alloy composed of magnesium and other elements. It is characterized by low density, high specific strength, large elastic modulus, good shock absorption, greater impact load bearing capacity than aluminum alloy and good corrosion resistance. The main alloying elements are aluminum, zinc, manganese, cerium, thorium and a small amount of zirconium or cadmium. At present, magnesium-aluminum alloy is widely used, followed by magnesium-manganese alloy and magnesium-zinc-zirconium alloy.
Magnesium alloy has the lightest specific gravity among all structural alloys, so it can reduce the weight of aluminum or iron parts without reducing the strength of parts. The specific strength of magnesium alloy is obviously higher than that of aluminum alloy and steel, and the specific stiffness is equivalent to that of aluminum alloy and steel. In the elastic range, magnesium alloy absorbs more energy than aluminum alloy when subjected to impact load, so magnesium alloy has good seismic and noise reduction performance. Under the same load, the vibration reduction is 100 times of aluminum and 300 ~ 500 times of titanium alloy. Good electromagnetic shielding performance. The casings of 3C products (mobile phones and computers) should provide superior electromagnetic protection, while the magnesium alloy casings can completely absorb electromagnetic interference with frequency exceeding 100db. Good texture, magnesium alloy has excellent appearance and touch texture, making the product more luxurious and not easy to corrode in the air.
Compared with alloys, magnesium alloys have absolute advantages in heat dissipation: according to the formula: Q=dvC△t, where q-heat; D= specific gravity; V= volume; C= specific heat capacity; △t =(t 1-t2) changing temperature; When magnesium alloy and aluminum alloy with the same volume and shape receive the same heat Q, the temperature ratio between them is △ T/△ T = 2.74x0.23/1.81x1.05 =1/3; That is, the magnesium alloy is aluminum alloy1/3; The thermal conductivity of magnesium alloy is 54 W/MK; ; The thermal conductivity of aluminum alloy is100 w/MK; The difference is twice. It means that for radiators made of magnesium alloy and aluminum alloy with the same volume and shape, the heat (temperature) generated by a heat source is more easily transferred from the root to the top of the radiator by magnesium alloy than by aluminum alloy, and the top is more likely to reach high temperature. That is to say, the temperature difference between the root and the top of the radiator made of aluminum alloy is smaller than that made of magnesium alloy. This means that the temperature difference between the air temperature at the root and the air temperature at the top of the heat sink made of magnesium alloy is greater than that of the heat sink made of aluminum alloy, which accelerates the diffusion and convection of air inside the heat sink and improves the heat dissipation efficiency. So at the same temperature, the heat dissipation time of magnesium alloy is less than half that of aluminum alloy.
Therefore, magnesium alloy is an ideal material for LED and other lighting, automobile parts and other accessories that require high quality, high strength and high toughness. Application in aerospace field
Magnesium alloy is the lightest metal structural material used in aircraft, spacecraft and rocket missile manufacturing. Magnesium is lighter than aluminum, its specific gravity is 1.8, and its strength is low, only 200 ~ 300 MPa (20 ~ 30 kg/mm2), which is mainly used to manufacture parts with low bearing capacity. Magnesium alloy is easy to be oxidized and corroded in humid air, and the surface of the parts needs to be chemically treated or painted before use. Germany first produced and used aluminum-containing magnesium alloys on airplanes. Magnesium alloy has high vibration resistance, can absorb large energy under impact load and good heat absorption performance, and is an ideal material for manufacturing aircraft wheels. Magnesium alloy is very stable in gasoline, kerosene and lubricating oil, and is suitable for manufacturing engine gearbox, oil pump and oil pipe. Because of its small inertia force in rotation and reciprocating motion, it is also used to manufacture moving parts such as rocker arms, flaps, hatches and rudder surfaces. Magnesium alloy products are widely used in civil aircraft and military aircraft, especially bombers. For example, the fuselage of the B-52 bomber used 635 kilograms of magnesium alloy plates, 90 kilograms of extruded parts and more than 200 kilograms of castings. Magnesium alloys are also used in some parts of missiles and satellites, such as the instrument cabin, tail cabin and engine support of China's "Hongqi" surface-to-air missile. China is rich in rare earth resources. In 1970s, magnesium alloy with yttrium added was developed, which improved the room temperature strength and can be used at 300℃ for a long time, and has been widely used in aerospace field.
At present, magnesium alloy parts used in automobiles can be divided into two categories.
(1) shell class. Such as clutch housing, valve cover, instrument panel, gearbox housing, crankcase, engine front cover, cylinder head, air conditioning housing, etc.
(2) brackets. Such as steering wheel, steering bracket, brake bracket, seat frame, rearview mirror bracket, power distribution bracket, etc.
According to relevant research, 60% of the fuel used by cars is consumed by their own weight. If the dead weight of the car is reduced by 65,438+00%, the fuel efficiency can be improved by more than 5%. When the vehicle weight is reduced by 100 kg, the fuel consumption per 100 kilometers can be reduced by about 0.7 L. When the fuel is saved by 1 L, the CO2 emission can be reduced by 2.5 g, and the annual emission can be reduced by more than 30%. Therefore, reducing the weight of the car has a great impact on the environment and energy, and the lightweight of the car has become an inevitable trend.
The LCD screen size of mobile phones and notebook computers is increasing year by year, and its supporting frame and back shell are made of magnesium alloy.
Although the thermal conductivity of magnesium alloy is not as good as that of aluminum alloy, it is several times higher than that of plastic. Therefore, magnesium alloy is used in electrical products, which can effectively dissipate the heat inside to the outside. Magnesium alloy is used in the shell and heat dissipation parts of computers and projectors that generate high temperature inside. Using magnesium alloy on TV shell can realize no heat dissipation holes.
Electromagnetic shielding: the electromagnetic shielding performance of magnesium alloy is better than that of electroplating shielding film on plastic, so the electroplating process of electromagnetic shielding film can be omitted when magnesium alloy is used.
Magnesium alloys are used for components close to vibration sources, such as reading devices of hard disk drives. If magnesium alloy is used in fan blades, vibration can be reduced and low noise can be achieved. In addition, in order to improve the absorption of impact force and reduce the weight of the car after being hit, the steering wheel and seat are made of magnesium alloy.
Application scope of alloy name characteristics
The housing of AZ9 1D electrical products has high strength and good corrosion resistance.
AM60B: Automobile steering wheel and seat, with high elongation and impact resistance.
AM50A: Steering wheel and seat in automobile, with high elongation and impact resistance.
AS4 1B has good creep resistance, such as the gearbox in the car.
machining property
Compared with other metals, magnesium alloy has smaller cutting resistance and faster machining speed.
Table: Cutting resistance of various metals (cutting resistance of magnesium alloy is 1)
Metal cutting resistance
Magnesium alloy 1.0
Aluminum alloy 1.8
Brass 2.3
Cast iron 3.5
Good sag resistance: Compared with other metals, magnesium alloy has greater deformation resistance, and sag caused by collision is smaller than other metals.
Absorbability of vibration and impact: Because magnesium alloy has good vibration energy absorption performance, it can reduce vibration when used in driving and transmission parts. In addition, magnesium alloy has good impact energy absorption performance and better elongation than aluminum alloy, and can absorb impact energy without breaking after impact.
Recycling: Unlike plastics, magnesium alloys can be simply recycled without reducing their mechanical properties, while plastics are difficult to recycle without reducing their mechanical properties. Compared with other metals, magnesium alloy has low melting point and small specific heat, and the energy consumed in the process of regenerative melting is 4% of the energy consumed in manufacturing new materials.
Table: Comparison of physical properties of various materials
Nominal density (g/cm3) melting point (℃) thermal conductivity (W/Mk) tensile strength (MPa) yield point (MPa) elongation (%) specific strength Young's modulus (GPa)
Magnesium alloy (thixoforming)
az 9 1 1.82 596 72 280 160 8 154 45
AM60 1.79 6 15 62 270 140 15 15 1 45
aluminium alloy
(die casting) 380 2.70 595100315160311771
Carbon steel 7.861520 42517 400 22 66 200
Plastic ABS1.0390 (TG) 0.235 * 40342.1
Pc1.23160 (TG) 0.2104 * 3 856.7 types of magnesium alloys
Application in digital SLR camera
Magnesium alloy is often used as the skeleton of SLR cameras because of its low density, high strength and certain corrosion resistance. Generally, high-end and professional digital SLR cameras use magnesium alloy as the skeleton, which is durable and feels good.
Digital SLR camera with magnesium alloy body is not only a symbol of quasi-professional expertise, but also expensive.
According to the forming method, it can be divided into wrought magnesium alloy and cast magnesium alloy.
1, alloy name
The alloy name of magnesium alloy is named after the main alloy elements and their percentages.
2. Composition of main alloy (ASTM specification)
Alloy name Mg, Al, Zn, Mn, Si, Cu, Ni and Fe
AZ9 1D balance. 8.5-9.5 0.45-0.90 0. 17-0.4 & lt； = 0.05 & lt= 0.025 & lt= 0.00 1 & lt； =0.004
AM60B balance. 5.6-6.4 & lt； = 0.20 0.26-0.5 & lt； = 0.05 & lt= 0.008 & lt= 0.00 1 & lt； =0.004
AM50A bal。 4.5-5.3 & lt； = 0.20 0.28-0.5 & lt； = 0.0 1 & lt； = 0.008 & lt= 0.00 1 & lt； =0.004
AS4 1B balance. 3.7-4.8 & lt； = 0. 10 0.35-0.60 0.6- 1.4 & lt； = 0.0 15 & lt； = 0.00 1 & lt； =0.0035 1.
2, aluminum, magnesium alloy solution or homogenization heat treatment method
3. Surface treatment method of magnesium alloy
4. Special die for magnesium alloy processing
5. Application of magnesium alloy in sprinkler irrigation equipment
6. Application of magnesium alloy in making alloy doors and windows and their profiles.
7. Heat-resistant and flame-retardant die-casting magnesium alloy and its melting and casting process
8. New forging process of magnesium alloy
9. Melting method of magnesium alloy
10, aluminum-containing magnesium alloy chemical treatment liquid, magnesium alloy products with high corrosion resistance and their manufacturing methods.
1 1, surface-treated magnesium alloy product with high corrosion resistance and its manufacturing method
12, aluminum-magnesium alloy cable trough profile
13, aluminum-magnesium alloy cable tray
14, magnesium alloy products coated with color film
15, aluminum-magnesium alloy cable trough profile
16, manufacturing method of reinforced carbon fiber for aluminum-magnesium alloy shell of notebook computer
17 high-strength magnesium alloy and preparation method thereof
18, special horizontal continuous casting machine for magnesium alloy
19 production process of magnesium alloy
20. Flame retardant protection method for magnesium alloy melting.
2 1, magnesium alloy surface treatment technology
22, magnesium alloy surface treatment method
23, magnesium alloy surface treatment method and magnesium alloy components
24, magnesium and magnesium alloy environment-friendly anodic oxidation electrolyte and its application.
25. A method for preparing magnesium alloy ingots.
26. A preparation method of magnesium alloy particles and products thereof.
27, magnesium alloy thin-walled casting die casting method
28, magnesium alloy containing mg2si strengthening phase refining melting and casting process
29, automotive multi-element heat-resistant magnesium alloy and its casting process.
30. A method for preparing ultra-fine grained wrought magnesium alloy.
3 1, low-cost heat-resistant magnesium alloy
32. Surface alloying process of magnesium alloy during solidification
33, die-casting magnesium alloy
34, low thermal cracking tendency solution strengthening high strength cast magnesium alloy
35. High-strength die-casting magnesium alloy with low thermal cracking tendency
36. Magnesium alloy molded product and its manufacturing method. Method of treating magnesium alloy surface with wet sandblasting machine.
38, magnesium alloy refining agent and production method
39. The coating structure and method of magnesium alloy molded products, and the application of the coating structure as an outer package.
40, magnesium alloy chip milling machine
4 1, magnesium alloy low-pressure casting system with electromagnetic pump
42, magnesium alloy chip CNC milling machine
43. Long-span aluminum-magnesium alloy bridge profiles
44, aluminum magnesium alloy anticorrosive coating
45. Downflow crucible for smelting high-purity magnesium and magnesium alloys
46, pressure flow high purity magnesium and magnesium alloy melting crucible
47. Adding calcium magnesium alloy to remove bismuth from molten lead.
48. Amide-based antifreeze concentrates for protecting magnesium and magnesium alloys and coolant compositions containing these concentrates.
49. A method of manufacturing a component made of magnesium and/or magnesium alloy.
50, magnesium alloy die casting machine body structure
5 1. Structure and recovery system of melting-free magnesium alloy waste recovery furnace
52. Magnesium alloy chemical conversion reagent, surface treatment method and magnesium alloy matrix.
53, creep resistant magnesium alloy
54. Magnesium alloy radiator and its manufacturing method
55, magnesium alloy airbag steering wheel skeleton
56. A cast magnesium alloy containing neodymium and strontium and a preparation method thereof.
57. Magnesium alloy composite flame retardant modification process.
58, magnesium alloy surface multi-element composite oxide film oxidation treatment method
59, magnesium alloy lost foam casting flame retardant coating and its preparation method.
60. Zn-Al-Cu-Mg alloy wire
6 1. magnesium alloy surface composite ceramic film and its forming method
62, waste magnesium alloy vacuum recovery process and equipment
63, magnesium alloy solid state stamping process
64, furnace heating solid diffusion magnesium or magnesium alloy products surface alloying method.
65. A new corrosion-resistant zinc-based rare earth aluminum-magnesium alloy anode material.
66. Magnesium alloy safety helmet or helmet and its preparation method
67. Magnesium alloys and magnesium alloy components have high corrosion resistance.
68. A pouring device for an inclined magnesium alloy melting furnace.
69, high ductility magnesium alloy material manufacturing method
70, magnesium alloy chromium-free chemical conversion film preparation method and film-forming solution.
7 1, ductile flame retardant magnesium alloy
72, with magnesium and magnesium alloy granulation method
73. A preparation method of magnesium alloy.
74, magnesium alloy wheel hub pressure casting device and method.
75. A magnesium alloy for casting wheel hub and its melting forming method.
76. A magnesium alloy refiner and a preparation method thereof.
77, magnesium alloy permanent mold casting coating and preparation method
78, magnesium alloy iron flux and its production method
79, magnesium alloy smelting furnace
80, magnesium alloy waste recycling process
Ultrasonic anodizing method for 8 1 magnesium alloy
82. A manufacturing method of copper-magnesium alloy stranded wire.
83, high magnesium alloy cored wire core agent and core production process
84. Magnesium alloy with excellent fluidity and its materials.
85. Manufacturing method of magnesium alloy plate for hot rolling and hot rolling method of magnesium alloy
86, magnesium alloy plate processing method and special equipment
87, the method of electroless nickel plating on magnesium alloy
88. Preparation method of special foam ceramic filter for magnesium alloy
89. Preparation method of polyaniline film with uniform surface on magnesium alloy
90, large remelting magnesium and magnesium alloy products to prevent shrinkage cracks.
9 1, magnesium alloy desiliconizing flux and its production method
92. Magnesium alloy profile blank, its continuous casting method and continuous casting device.
93. A casting method of magnesium and magnesium alloy ingots.
94. Motorcycle engine magnesium alloy left rear cover.
95. Method for removing coating, method for preparing recycled magnesium alloy and method for recycling coating.
96, motorcycle engine magnesium alloy left front cover.
97. Motorcycle engine magnesium alloy right crankcase cover.
98, magnesium alloy plate hot stamping device
99. A magnesium and magnesium alloy ingot casting equipment.
100 horizontal cold chamber magnesium alloy die casting machine
At present, the construction of six magnesium alloy bases in China has begun to take shape, forming the layout of Chongqing-magnesium alloy automobile and motorcycle manufacturing, Qingdao-information and communication product development, Shanghai-automobile industry application, Shenzhen-magnesium alloy die-casting equipment, Liaoning-magnesium oxide and magnesium mine development, and Ningxia-salt lake magnesium resource development.