Authigenic Al3Ni and Si mixed particle aluminium alloy piston for local enhancement and preparation method thereof

Abstract

The invention relates to an authigenic Al3Ni and Si mixed particle aluminium alloy piston for local enhancement and a preparation method thereof. The aluminium alloy piston comprises a head, a skirt and a pin hole, wherein the head comprises a piston top and a ring slot; the piston top and the ring slot are arranged in an enhancement area formed by authigenic and separated primary Al3Ni and primary Si in the solidification process of alloy; the volume fraction of the primary particles in the enhancement area is gradually decreased from the piston top to the ring slot; and the piston skirt and the pin hole are arranged in the non-enhancement area with no particles. The piston realizes the continuous transition of organization structure and performance of the enhancement area and the non-enhancement area. The piston head has excellent high-temperature resistance and wear resistance, and the skirt has good comprehensive mechanical property, so as to be applicable to high-emission engines. The molten primary enhanced particles in the homogeneous aluminum matrix composite are collected at the piston top and the ring slot by means of a centrifugal casting method, the process is simple, and the service life of the piston is long.

Description

technical field [0001] The present invention relates to a kind of engine cylinder part, especially a kind of self-generated Al 3 Ni and Si mixed particle locally reinforced aluminum alloy piston and its preparation method. Background technique [0002] The piston bears alternating mechanical and thermal loads during engine operation, and its working environment is very harsh, which requires the piston to have excellent mechanical properties and high temperature resistance. With the continuous development of society, the requirements for energy saving and environmental protection of the automobile industry are becoming more and more stringent, which provides conditions for the development and mass application of aluminum alloy pistons. However, with the continuous development of high-power engines, the strength of engine pistons , high temperature wear resistance and weight and other aspects put forward further requirements. In order to enhance the strength and high tempera...

AI Technical Summary

Problems solved by technology

Therefore, the hardness and wear resistance of the material need to be improved

[0005] However, the preparation of Al-Si-Ni ternary alloy gradient functional materials by centrifugal casting method has not been reported yet.

Images