Multi-component zinc-aluminium alloy capable of enhancing thermal fatigue property

Abstract

A multi-component zinc-aluminium alloy capable of enhancing thermal fatigue property belongs to the technical field of zinc-aluminium alloy preparation and is characterized in that No.A00 industrial aluminium ingots, No.0 zinc ingots, electrolytic copper, composite modifier (including 20 to 30 percent of Ni, 15 to 25 percent of Ti, 5 to 15 percent of Mn, 5 to 15 percent of Cr, 5 to 10 percent of Si, 5 to 10 percent of Ce, 5 to 10 percent of La, 1 to 6 percent of Y, 1 to 6 percent of Nb, 1 to 6 percent of V and the balance of aluminium) and pure magnesium are adopted as materials. Calculated according to percentage by weight, 27 to 29 percent of Al, 2 to 2.5 percent of Cu (added in the form of aluminium-copper master alloy containing 50 percent of copper), 0 to 1.2 percent of composite modifier, 0.01 to 0.02 percent of Mg and the balance of Zn are weighed and then smelted in a medium-frequency induction smelting furnace. An ordinary metal mold is adopted to cast round rod-shaped billets, the round bar-shaped billets are machined into test bars which come up to national standard, and thermal fatigue samples are then taken from the billets.

Description

technical field [0001] The invention belongs to the technical field of zinc-aluminum alloy preparation, in particular to a multi-element zinc-aluminum alloy capable of improving thermal fatigue performance. Background technique [0002] The application and development of aluminum-zinc alloy is one of the hot spots in the field of metal material research in the 1980s and 1990s. This is because as a substitute material for copper, tin and their alloys, aluminum-zinc alloys have the advantages of high tensile strength and hardness, good damping, good wear resistance, small friction coefficient, low friction temperature rise, and low material and manufacturing costs. . However, aluminum-zinc alloys also have disadvantages such as poor plasticity and toughness, low dimensional stability, low working temperature, poor creep resistance, and poor corrosion resistance. Over the years, people have made unremitting efforts to overcome these shortcomings in order to expand its applica...

AI Technical Summary

Problems solved by technology

Another defect of zinc-aluminum alloy is its poor thermal strength. The thermal strength of zinc-aluminum alloy is very poor. It is not easy to maintain the original strength at 120°C.

This is mainly due to the following reasons: First, the inherent reasons of the material itself, the melting point of zinc itself is low, only 419 ° C; second, the main strengthening effects of the alloy are solid solution strengthening and precipitation strengthening, and these strengthening effects are very good at room temperature , but it is not good at high temperatures. 150 ° C basically has no strengthening effect; the third is that the solidification temperature range of zinc-aluminum alloy is large, and the macro-segregation is serious under conventional casting conditions, so that there are many low melting points between dendrites, such as ZA27 The solidus line is at 433°C, but under actual casting conditions, the final solidus line is approximately 380°C due to the low melting point eutectic region caused by segregation

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