An aluminum alloy having a density lower than 10% lower than that of a general aluminum alloy is called an ultra-light aluminum alloy. Adding 2% to 3% of Li in aluminum, the density can be reduced by 10%, and the elastic modulus can be increased by 25% to 30%. Therefore, the Al-Li alloy is a typical ultra-light aluminum alloy. At present, the Al-Li alloys developed by various countries mainly include Al-Mg-Li, A1-Cu-Mg-Li, Al-Mg-Li-Mn, Al-Li-Zn, Al-Li-Cu-Mg-Zr, Al- Li-Mg-Zr and other alloys. Al-Li alloys are characterized by low density, high modulus of elasticity and high strength. Therefore, in many cases, the 7XXX series ultra-high-strength aluminum alloy can be used to make important structural components such as aircraft and spacecraft.
What is a soft aluminum alloy?
An aluminum alloy having a tensile strength Rm < 294 MPa is called a soft aluminum alloy. Industrial pure aluminum, aluminum-manganese alloy (such as 3003, 3004, etc.), aluminum-magnesium alloy (such as 5AO1, 5AO2, 5A04, etc.), aluminum-silicon alloy (such as 4004, 4043, etc.) and other non-reinforced alloys after heat treatment are soft aluminum alloys. The semi-finished product is used in an annealed state and after cold work hardening. Some aluminum-magnesium-silicon alloys, such as 6063, 6063A, 6005, etc., are also soft aluminum alloys, but these alloys can be heat-treated and their semi-finished products are generally used in the T5 or T6 state. Soft aluminum alloys have good weldability and high corrosion resistance, and plasticity and workability are also very good.
What is a new high-strength heat-resistant aluminum alloy?
Different from ordinary Al-Cu-Mn heat-resistant aluminum alloys prepared by conventional casting method (I/M) (such as 2A16, 2A17, 2A70, 2219, 2021, 2618, etc.), new high-strength heat-resistant aluminum alloy (high- Strength&heat-resisting aluminium alloy) is produced by powder metallurgy (P/M) with higher strength (up to 700 MPa at normal temperature and Rm up to 300 MPa at high temperature). The new high-strength heat-resistant aluminum alloy is a new generation of aluminum alloy with high temperature (up to 300-500 °C). At present, methods for manufacturing high-strength heat-resistant aluminum alloys in various countries in the world include P/M method, rapid solidification milling method (RS method), and mechanical alloying powder production method (MA method). The new high-strength heat-resistant aluminum alloys developed mainly include Al-Mg-Ni, Al-Ni, Al-Fe-Co, Al-Ti, Al-Fe-Cr, Al-Mn-Co and other alloys. These alloys have high normal temperature and high temperature strength, high specific strength and specific stiffness, and high wear resistance. They can replace jet alloy engine pulleys, gas turbine blades, powerful engine pistons, piston rods, pinions, and aluminum probes. Tubes, as well as various parts on aerospace vehicles and automobiles.
What is a medium-strength weldable aluminum alloy?
Zn and Mg are alloying elements having the highest solubility in Al, and Al-Zn-Mg alloys have strong age hardening ability. The room temperature strength (Rm) after heat treatment can reach 450 MPa or more, belonging to medium-strength aluminum alloy, and it has excellent weldability, so it is called median strength weldable aluminum alloy. The total content of Zn and Mg in such alloys is between 4.5% and 7.6%, belonging to the α+ T type alloy. The addition of trace amounts of Cu, Mn, Cr, Zr, Ti, Ag and Sc can greatly improve the stress corrosion resistance. These alloys have medium strength, excellent plasticity, weldability, corrosion resistance and low temperature performance. They are widely used in the production of railway vehicles, sea boats, motorcycles and bicycle accessories. They can also weld large rocket fuel tanks. , ultra-low temperature pressure vessels, armor plates and general construction.
What is an explosion-proof aluminum alloy?
It does not generate sparks during friction and collision, and can be used in a flammable and explosive environment. The aluminum alloy material that does not burn and explode is called anti-explosionaluminium alloy. The main alloying elements in explosion-proof aluminum alloys are high melting point elements such as Cu, Zn, Fe, etc., and active elements such as Mg and Li should be strictly controlled, for example, the Mg content should be controlled to be 0.05% or less.
What is a porous aluminum alloy?
Porous aluminum alloy, also known as foam aluminum alloy, is a new multi-functional material with low porosity (hole) and low density. Foamed aluminum alloy is an aggregate composed of bubbles and aluminum diaphragm. The irregularity and three-dimensionality of the bubble make it have many excellent characteristics, such as low density, high porosity, large specific surface area, and selective fluid permeability. Structural features, thus high damping properties, excellent thermophysical properties, excellent flow properties and excellent acoustic and electromagnetic properties. The methods for preparing the porous aluminum alloy include powder metallurgy, casting, physical vapor deposition, chemical/electrochemical deposition, and gaseous eutectic transformation. The pore size of the porous aluminum alloy is mainly controlled by the particle size of the preform, and the porosity is related to the degree of compaction of the pellet and the addition amount of the binder when preparing the preform. Porous materials are used in filters, self-lubricating bearings, support materials for rockets and jet engines. The applications currently being developed include electromagnetic and neutron absorbers for solar and nuclear power generation, inner walls of nuclear reactors, filler materials for laminated panels for shipbuilding and aerospace, seals for turbojet engines, and storage for hydrogen energy processes. Hydrogen device, etc.
What is superplastic aluminum alloy?
Superplastic aluminum alloy refers to an aluminum alloy that has extremely abnormal plasticity under certain conditions, does not break or even shrinks, and has the ability to withstand strain deformation in a wide range of strain rates. Certain conditions refer to external conditions such as the internal structure of the aluminum material, grain size and morphology, and deformation temperature and deformation speed. At present, there are more than 100 kinds of aluminum alloys with superplasticity. Among them, there are five kinds of industrial aluminum alloys, including pure aluminum, aluminum-copper alloys, aluminum-magnesium alloys and aluminum alloys, but the metal does not “automatically” have superplasticity and must be under certain temperature conditions. Pre-treatment of the alloy can be achieved. The use of superplasticity of metals makes it possible to produce highly precise and extremely complex shapes that are not achievable by conventional forging or casting methods. Although the processing temperature range and deformation speed of superplastic metal are limited, it has a wide range of applications because of its fine grain structure and easy bonding with other alloys to form a composite material.
Superplastic aluminum alloys mainly include Al-Ca-Zn, Al-Cu-Zr, Al-Cu-Mg, Al-Mg, A1-Zn-Mg-Zr, A1-Zn-Mg-Cu, Al-Mg-Si system, Al-Li system and Al-Sc system superplastic alloy.