ã€China Aluminum Industry Net】 Pure aluminum has low mechanical properties and is not suitable for making structural parts that can withstand large loads. In order to improve the mechanical properties of aluminum, certain alloying elements are added to pure aluminum to make alloys. The alloying elements often added include copper, magnesium, chromium, zinc, silicon, manganese, nickel, cobalt, titanium, and tantalum. Add in some alloys. After these alloying elements are added, aluminum is strengthened by the following aspects. Test tubes, Pipette guns, Centrifuge Tubes, etc. in the laboratory need to be organized. Therefore, there is a need for laboratory table top racks that are easy to clean, store, and transport. laboratory rack plastic,rack for laboratory,storage rack for laboratory Yong Yue Medical Technology(Kunshan) Co.,Ltd , https://www.yongyuetube.com
1. Solid solution strengthening alloy elements added to pure aluminum to form infinite solid solution or limited solid solution not only can obtain high strength, but also can obtain excellent plasticity and good pressure processing performance. The commonly used alloying elements for solid solution strengthening in general aluminum alloys are copper, magnesium, manganese, zinc, silicon, nickel and other elements. The general alloying of Al forms limited solid solution, such as Al-Cu, Al-Mg, Al-Zn, Al-Si, Al-Mn and other binary alloys all form a finite solid solution, and all have a large limit of solubility Larger solid solution strengthening effect.
2. Aluminum-based solid solutions with supersaturation can be obtained by aging heat treatment of aluminum alloys. When the supersaturated aluminum-based solid solution is heated to a certain temperature at room temperature, its strength and hardness increase with time and elongation, but the plasticity decreases. This process is called aging. The phenomenon of increasing the strength and hardness of the alloy in the aging process is called aging strengthening or age hardening.
3. Excess phase strengthening When the water content of the alloying element added to the aluminum exceeds its limiting solubility, a second phase that does not dissolve into the solid solution when quenched and heated appears as an excess phase. The excess phase in the aluminum alloy is mostly a hard and brittle intermetallic compound. They play a role in impeding the slip and dislocation movement in the alloy, increasing the strength and hardness, and decreasing the plasticity and toughness. The more the amount of excess phase in the alloy, the better the strengthening effect, but when the excess phase is large, the strength and plasticity decrease due to the brittleness of the alloy.
4. Refinement of tissue reinforcement The addition of trace elements in the aluminum alloy to refine the microstructure is another important means to improve the mechanical properties of the aluminum alloy.
The addition of trace amounts of titanium, zirconium, niobium, tantalum, and rare earth elements to deformed aluminum alloys can form refractory compounds that act as non-spontaneous nucleation in the crystallization of the alloy, refine the grains, and increase the strength and ductility of the alloy.
Casting aluminum alloy often add trace elements for modification to refine the alloy structure, improve strength and plasticity. Deterioration treatment is of particular importance for cast aluminum alloys and deformed aluminum alloys, which cannot be heat-treated or hardened. For example, in the aluminum-silicon casting aluminum alloy, adding a trace amount of sodium or sodium salt or cerium as a modifier to modify the treatment, refining the structure can significantly improve the plasticity and strength. Similarly, adding a small amount of manganese, chromium, cobalt and other elements to the cast aluminum alloy can refine the plate-like or needle-like compound AlFeSi formed by the impurity iron, improve the plasticity, and add a small amount of niobium to eliminate or reduce the primary silicon and make the eutectic silicon. Refinement; particle gardens improve overall level.
5. Cold deformation strengthening Cold deformation hardening is also called cold hardening, that is, metal materials cold deformation below the recrystallization temperature, cold deformation, the dislocation density increases within the metal, and entangled with each other and form a cell structure, hinder dislocation movement . The greater the degree of deformation is, the more serious the dislocation tangles are, and the greater the deformation resistance is, the higher the strength is. The degree of hardening after cold deformation varies with the degree of deformation, deformation temperature, and the nature of the material itself. When the same material is cold-deformed at the same temperature, the greater the degree of deformation, the higher the strength. Plasticity decreases as the degree of deformation increases.
Five aspects of aluminum alloy strengthening