Magnesium is a silvery white metal and one of the most abundant light metal elements in the earth's crust. Its density is 1.74 g/cm3, which is 2/3 of that of aluminum and 1/4 of that of steel. It is the lightest structural metal material. Magnesium, together with aluminum and zinc, can form a practical alloy with great industrial value. It has high specific strength and stiffness, high thermal and electrical conductivity, no magnetism, excellent dimensional stability, and good energy absorption characteristics. It is a good material for manufacturing anti-vibration parts. Because of these characteristics, magnesium alloy, as a structural material, is widely used in transportation industry, electronic communication, medical treatment, military industry, and other fields.
Application of magnesium alloy：
Magnesium alloy has good lightweight, machinability, corrosion resistance, shock absorption, dimensional stability, and impact resistance, far superior to other materials. These characteristics make magnesium alloys used in a wide range of fields, such as transportation, electronic industry, medical field, military industry, etc., and this trend is only increasing.
Application Field of Magnesium Alloy：
Since the 20th century, magnesium alloys have been applied in the aerospace field. Because magnesium alloy can greatly improve the aerodynamic performance of aircraft and obviously reduce its structural weight, many parts are made of it. Generally, magnesium alloys for aviation are mainly plates and extruded profiles, and a few of them are castings. At present, the application fields of magnesium alloys in aviation include civil and military aircraft parts, propellers, gearboxes, support structures, and some parts of rockets, missiles, and satellites.
Magnesium alloy has been widely used in developed countries in automobile instrument panels, seat brackets, gearbox housing, steering system components, engine hood, door, engine block, frame, and other parts. Using magnesium alloy to manufacture automobile parts can significantly reduce the weight, fuel consumption, exhaust emission, integration of parts and components, the flexibility of automobile design, etc.
The notebook computer uses magnesium alloy as the casing, which is based on almost all the advantages of magnesium alloy: the shockproof performance improves the reliable operation of computer components; Anti-electromagnetic interference and electromagnetic shielding performance ensure computer information security; Excellent thermal conductivity greatly improves the heat dissipation problem of the computer.
2. Mobile phone
The mobile phone makes use of the special functions of magnesium alloy, such as shock resistance, abrasion resistance, and electromagnetic wave shielding, and can meet the requirements of light, thin, short, and small. At the same time, the electromagnetic compatibility of the mobile phone with a magnesium alloy shell has been greatly improved, which reduces the loss of electromagnetic waves in the communication process and the harm of electromagnetic waves to the human body. According to statistics, 400 million mobile phones were produced worldwide in 2005, of which about 10% ~ 11% were made of magnesium alloy cases.
3. Digital camera
The skeleton of SLR cameras is usually made of magnesium alloy. Generally, high-end and professional digital SLR cameras are made of magnesium alloy, which makes them durable and feels good.
In the medical field, magnesium was first introduced as an orthopedic biomaterial, and its many features and properties make magnesium implants and similar applications a very attractive option. In the early days, stainless steel, titanium alloys, and cobalt-chromium alloys were used for medical implant metal materials. However, the implantation of these metallic materials causes many patients to suffer for a period of time. Because these materials cannot be fused with the body, the harmful metal ions are dissolved, causing human allergies. After recovery, they need to be removed through a second operation.
Therefore, biodegradable medical metal materials will become the future research and development direction of implant materials, and magnesium alloys, which are the closest in density to human bones, have unique advantages (the density of magnesium alloys is about 1.7g/cm³, and the density of human bones is about 1.7g/cm³. 1.75 g/cm³).
Magnesium alloy is easy to process and shape and has excellent comprehensive mechanical properties and unique biodegradability. Magnesium is one of the macro elements necessary for the human body, so magnesium alloy is the best choice for medical metal materials. The elastic modulus of magnesium alloy is about 45GPa, which is also close to that of human bones (10~40GPa), which can effectively relieve or even avoid the "stress shielding effect." Magnesium ions released from magnesium alloys can also promote the proliferation and differentiation of bone cells and promote the growth and healing of bones.
The use of magnesium alloy in military equipment can improve the strength of structural parts, reduce the weight of equipment and improve the hit rate of weapons. At the same time, magnesium alloy can meet the requirements of high-tech fields such as aeronautics and astronautics for noise absorption, shock absorption, and radiation protection, obviously improving the aerodynamic performance of aircraft and reducing the structural weight.
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