High-strength, high-toughness and heat-resistant aluminum alloy material for internal combustion engine and preparation method of aluminum alloy material

Abstract

The invention discloses a high-strength, high-toughness and heat-resistant aluminum alloy material for an internal combustion engine. The aluminum alloy material is prepared from alloy elements in percentage by weight as follows: 9.0%-17.0% of Si, 2.0%-7.0% of Cu, 1.5%-5.5% of Ni, 0.6%-1.5% of Mg, 0.2%-1.1% of Fe, 0.2%-1.1% of Cr, 0.1%-0.3% of Ti, 0.15%-0.5% of B, 0.1%-0.3% of C, 0.08%-0.12% of P,0.4%-0.6% of RE (rare earth) elements, less than or equal to 0.3% of Zr, less than or equal to 0.3% of Sc and the balance Al. The invention further provides a preparation method of the aluminum alloymaterial, wherein briquettes containing B, Ti and Al mixed salt and briquettes containing Ti, Al and C mixed salt directly react in aluminum alloy melt to produce a micro-nano strengthening phase, and then the aluminum alloy material can be prepared.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and in particular relates to a high-strength and tough heat-resistant aluminum alloy material for an internal combustion engine and a preparation method thereof. Background technique [0002] As the power density of the internal combustion engine increases, the temperature and explosion pressure of the combustion chamber increase, so that the key components of the diesel engine combustion chamber need to withstand high temperature, high pressure and high operating frequency, especially the piston. Reaching 425°C, 22MPa and 70Hz, it is required that the key component materials of the combustion chamber must have excellent casting properties, high strength and toughness, high thermal fatigue resistance, high thermal stability and low thermal expansion coefficient. [0003] The key components of conventional combustion chambers currently used are prone to cracking, ablation, cylin...

AI Technical Summary

Problems solved by technology

[0003] The key components of conventional combustion chambers currently used are prone to cracking, ablation, cylinder scuffing and fragmentation under power density conditions, mainly because the aluminum alloy material of the key components has a coarse structure, more harmful phases, and less high-temperature strengthening phases , resulting in poor creep and fatigue performance of the material at high temperature

Therefore, the existing aluminum alloy materials for the key components of the combustion chamber can no longer meet the current use requirements, so it is urgent to prepare a new high-strength and heat-resistant aluminum alloy material for internal combustion engines to solve the above problems

Images