Study on the relationship between pore morphology and casting properties of alloy aluminum plate

It is reported that some scholars have done unidirectional solidification experiments of Al-Si alloy aluminum plate, and discussed the relationship between solidification transition layer and porosity during solidification. In addition, the specimen was cut every 10mm along the height direction of the ingot, and the bending test was carried out on each specimen, and the relationship between the pore shape and the casting performance was discussed, so the following conclusions were drawn:

1. During non-equilibrium unidirectional solidification, 3%Si alloy develops in the form of solidification transition layer with wider width of Q layer than P layer, while 1%Si alloy solidifies in the form of transition layer with wider width of P layer than Q layer.

2. Observing the cross section of the bending specimen cut from the unidirectional solidified 3%Si alloy ingot, we can see that the shape of the fine pore defects is spherical with depth and some volume, while the 1%Si alloy aluminum plate is planar, and even the specimen with less porosity can see more dendrite separation surfaces in the cross section. The difference of these pore shapes is the reason for the difference of solid transition layer shape.

3. In 3%Si alloy ingot, the bending strength and absorbed energy of unidirectional solidified materials decrease with the increase of porosity, while in 1%Si alloy ingot, the bending strength and absorbed energy increase. If porosity is used to identify the characteristics of materials, the results will be contradictory. If the dendrite separation defect rate is used to identify, both 1%Si alloy and 3%Si alloy aluminum plates show a proportional relationship consistent with the bending test results.

What are the characteristics of applying alloy aluminum plate in engineering?

The application of alloy aluminum formwork in engineering has the characteristic that concrete can be completed only by a single pouring. The reason is that the alloy aluminum formwork system can organically combine several separate systems such as top formwork and wall formwork, thus assembling into a whole frame.

In addition to aluminum profiles and supporting systems, architectural alloy aluminum formwork also needs to have fastening systems and accessory systems. In the construction of concrete structure, it is necessary to use formwork system to construct the closed surface, so as to shape the building structure.

The supporting system and top die system of aluminum alloy formwork can be designed as a whole. In the supporting system, the application of early dismantling technology can greatly improve the turnover rate and construction efficiency of formwork, and also reduce the related costs.

The application of aluminum alloy formwork technology can realize factory construction and greatly improve the construction speed. Through the in-depth design of construction drawings, the aluminum alloy formwork is assembled in the factory, and then it can be transported to the construction site. Because the possible problems in the construction were solved in the factory, the construction technology of alloy aluminum plate not only greatly improved the construction speed, but also greatly improved the construction accuracy.

Alloy aluminum template not only has a long service life, but also can be recycled. In addition, the alloy aluminum template also has high recycling value. Therefore, the use of alloy aluminum formwork technology can reduce the construction cost and material cost, and bring higher economic benefits to construction enterprises.

The self-weight of aluminum alloy formwork is relatively light, and the mass of aluminum alloy formwork for building is less than 19 kg per m2. Because the alloy aluminum formwork has high strength and precision, it greatly reduces the flat seam on the board, which is convenient for construction and high in efficiency. When assembling the formwork, it can be completed with the help of manpower without any mechanical equipment. In addition, there is basically no technical requirement for workers to install aluminum alloy formwork. As long as these workers are trained simply, they can assemble the formwork.

Using alloy aluminum plate can make the construction site achieve the environmental protection function of no construction waste. Building aluminum formwork is a kind of green formwork. After the formwork is dismantled, no garbage will be produced. Using this kind of building formwork will make the construction environment cleaner and cleaner.

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