Tin-aluminum-calcium heat-resisting magnesium alloy

Abstract

The invention discloses a tin-aluminum-calcium heat-resisting magnesium alloy comprising the following components in percentage by weight: 2-5% of tin, 1-3% of aluminum, 0.5-2% of calcium and the balance of magnesium. The heat-resisting magnesium alloy uses metallic elements such as tin, aluminum and calcium having relatively lower price to be alloyed with magnesium, and takes advantages of the characteristic that the tin element and the calcium element are molten in the magnesium at high temperature while forming high melting point dispersion strengthening phase at relatively low temperatureto strengthen the matrix and the crystal boundary of the magnesium alloy. The aluminum element is utilized to strengthen the matrix and improve the corrosion resisting property of the magnesium alloymaterial, the mechanical property of the magnesium alloy is equal to AZ91 at normal temperature and equal to AE42 at 150-200 DEG C, and the cost of production is low, therefore, the material is quitesuitable for being used as the processing material of automobile components, especially suitable for processing automobile power train parts.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a tin-aluminum-calcium heat-resistant magnesium alloy. Background technique [0002] Magnesium is very suitable as a processing material for automotive components because of its low density, high specific strength and good vibration damping; however, its creep strength and yield strength will drop sharply in a high temperature environment, losing its original high strength. In response to this situation, various types of magnesium alloy materials have been developed in the prior art to make them have good heat resistance. [0003] However, the yield strength of commonly used cast magnesium alloys (such as AZ91) will decrease significantly with the increase of temperature, especially when the service temperature exceeds 120°C, the yield strength will drop sharply, so it can only be used in environments below 120°C. The AS41 of the AS series has no significant improvement in hi...

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Problems solved by technology

[0003] The commonly used cast magnesium alloy (such as AZ91), its yield strength will decrease significantly with the increase of temperature, especially when the service temperature exceeds 120 ℃, the yield strength will drop sharply, so it can only be used in the environment below 120 ℃

The AS41 of the AS series has no significant improvement in high temperature resistance compared with AZ91, and its mechanical properties at room temperature are poor, and it is easy to form thick Chinese character Mg 2 Si structure, and the casting process is complicated, and the corrosion resistance is not good; other types of tin-aluminum-calcium heat-resistant magnesium alloys mostly contain rare and precious metal elements and even radioactive elements (such as thorium), such as AE42-containing about 2% Rare earth, Mg-Sc series contains scandium, WE series WE43 contains 4% yttrium and 3% rare earth, QE series QE22 contains 2.5% silver and 2% rare earth, Mg-Th series HK31 contains 3.3% thorium and 0.7% zirconium, these Although the heat-resistant magnesium alloys of tin-aluminum-calcium alloys have good heat resistance, they require high manufacturing processes and high production costs, and their use in the production of automotive components will greatly increase the manufacturing costs