Several rapid solidification technologies, including atomization, centrifugal casting and plane melt casting, have been used to develop a series of high-temperature aluminum alloy forgings, which have greatly improved high-temperature properties compared with the existing ingot metallurgical forged aluminum alloys (such as 2219 and 2618 alloys) and A201 cast aluminum alloys. These alloys are developed to provide forgings with enhanced properties in the temperature range of 205-345°C, which cannot be achieved by existing aluminum alloys.

The high temperature characteristics of these alloys make it difficult to process them into forgings with twice the flow stress of 7075 alloy. The recommended forging temperature of aluminum alloy box has not been completely determined, and it is usually forged below 370℃ to maintain the microstructure characteristics of the alloy. All these high-temperature aluminum alloys are non-heat-treatable, and their mechanical properties can be improved by dispersion strengthening, intermediate compounds and work hardening.

What kinds of aluminum alloy forgings can be divided into?

Aluminum alloy forgings are mainly classified according to forming methods and deformation temperatures. According to the forming method, forging can be divided into two categories: forging and stamping; According to deformation temperature, forging can be divided into hot forging, cold forging, warm forging and isothermal forging.

Hot forging is forging above the recrystallization temperature of metal. Increasing the temperature can improve the plasticity of metal, which is beneficial to improve the internal quality of forgings and is not easy to crack. High temperature will also reduce the deformation resistance of metal and reduce the tonnage of forging machinery. However, there are many hot forging processes, the workpiece precision is poor, the surface is not smooth, and the forgings are easy to oxidize, decarburize and burn.

Cold forging is forging below the recrystallization temperature of metal. The so-called cold forging mostly refers to normal temperature forging. Warm forging is forging at a temperature higher than normal temperature but not higher than recrystallization temperature.

Warm forging has higher precision, smoother surface and less deformation resistance. The workpiece formed by cold forging at room temperature has high accuracy in shape and size, smooth surface and machining. ? Has few steps and is convenient for automatic production. Many cold forgings and cold stamping parts can be directly used as parts or products without cutting. However, in cold forging, due to the low plasticity of metal, easy cracking during deformation and great deformation resistance, a large-tonnage forging press is needed.

Isothermal forging is to keep the blank temperature at a constant value during the whole forming process of forgings. Isothermal forging is to make full use of the high plasticity of some metals at the same temperature, or to obtain specific structures and properties. Isothermal forging needs to keep the die and blank at a constant temperature, which is costly and only used in forging processes such as superplastic forming.

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