Quasicrystal-strengthened Mg-6Zn-3Y alloy with ultrafine solidification texture and preparation method thereof

Abstract

The invention discloses a quasicrystal-strengthened Mg-6Zn-3Y alloy with an ultrafine solidification texture and a preparation method thereof. The quasicrystal-strengthened Mg-6Zn-3Y alloy consists of the following chemical components in percentage by weight: 87.0 to 93.0 percent of Mg, 3.0 to 10.0 percent of Zn and 0.5 to 3.0 percent of Y. The Mg-6Zn-3Y alloy with the ultrafine solidification texture, which contains nanoscale granular quasicrystals, is prepared from normal-pressure as-cast Mg-Zn-Y alloy material under GPa-level ultrahigh pressure as solidification pressure, temperature and solidification cooling rate are controlled. The as-cast texture is characterized in that: the granular quasicrystals are evenly and dispersely distributed on the ultrafine Alpha-Mg matrix, wherein the secondary dendrite arm spacing between Alpha-Mg dendrites is 7Mu m to 10Mu m, the diameter of the granular quasicrystal is 50nm to 100nm, and the volume of the granular quasicrystals accounts for 25 to 35 percent of the total volume of the alloy. The invention adopts a cubic press, solidification process parameters are controlled, i.e., the solidification pressure is 6GPa, the solidification temperature is 1300DEG C, and the solidification rate is 300K / S. Theultrafin quasicrystal-strengthened Mg-6Zn-3Y alloy has high mechanical properties and good thermal stability.

Description

technical field [0001] The invention relates to an autogenous quasi-crystal reinforced alloy with superfine solidification structure and a preparation method thereof, in particular to a quasi-crystal reinforced Mg-6Zn-3Y alloy with superfine solidification structure and a preparation method thereof. Background technique [0002] Magnesium alloy has the characteristics of excellent electrical conductivity, thermal conductivity, electromagnetic shielding performance, high specific strength, specific stiffness, and shock absorption. It is currently the lightest metal structural material in practical application. and consumer electronics) and other industries have broad application prospects. However, due to the low strength, poor toughness, difficult plastic processing and poor high temperature creep performance of magnesium alloys, its further application in industry is limited. Therefore, improving the mechanical properties of magnesium alloys through various preparation tec...

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Problems solved by technology

[0008] To sum up, the technical content of the patent disclosed above is mainly about the magnesium-based spherical quasicrystalline master alloy prepared under ordinary solidification and rapid solidification conditions. There are few reports on the level of quasicrystalline scale, especially for the preparation of quasicrystalline reinforced Mg-6Zn-3Y alloys with ultra-fine solidified structure under ultra-high pressure.

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