High elasticity modulus magnesium based composite with high strontium content and high aluminum content and preparation method for high elasticity modulus magnesium based composite

Abstract

The invention discloses a high elasticity modulus magnesium based composite with high strontium content and high aluminum content. The high elasticity modulus magnesium based composite is prepared from the following components in percentage by mass: 2.00-35.00 percent of Sr, 3.00-25.00 percent of Al, 0.00-3.00 percent of Ca, 0.00-8.00 percent of Nd, 0.00-8.00 percent of Y, 0.00-8.00 percent of Gd,0.00-8.00 percent of Er and the balance of Mg and impurities. A preparation method comprises the following steps of (1) preparation of materials; and (2) smelting of a casting iron. The high elasticity modulus magnesium based composite with high strontium content and high aluminum content and the preparation method have the beneficial effects that 1, compared with the conventional magnesium-aluminum-strontium magnesium alloy, the high elasticity modulus magnesium based composite more concerns the elasticity modulus of the material while concerning the strength, the composition of eutectic structure phases is an alpha-Mg phase as well as a Mg17Sr2 phase, an Al2Sr phase and an Al4Sr phase with high elasticity modulus, the eutectic structure content is relatively high, and the whole elasticity modulus of the material is further controlled by effectively controlling the components; and 2, ordinary casting is adopted, the technological process is simple, and the high elasticity modulus magnesium based composite with strength and toughness is prepared by controlling the components to control the morphology of the eutectic structure.

Description

technical field [0001] The invention belongs to the field of magnesium alloys and magnesium-based composite materials, and in particular relates to a high-elastic-modulus magnesium-based composite material with high strontium and high aluminum content and a preparation method. Background technique [0002] In recent years, the energy crisis, resource depletion and environmental degradation have put forward higher requirements for aerospace and automotive industry's lightweight, energy saving and emission reduction and low-carbon environmental protection. Magnesium alloys have attracted increasing attention due to their excellent properties such as low density, high specific strength, and high specific stiffness, and have become an important research direction for metal structural materials in recent years. Most of the relevant research work in the early stage focused on the strength and toughness of magnesium alloys: solid solution strengthening and precipitation strengtheni...

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Problems solved by technology

At present, the alloying elements added to non-rare earth magnesium alloys generally do not exceed 10% (mass percentage), and the strengthening design ideas of magnesium alloy materials are mostly imitated by aluminum alloy materials, that is, the heat treatment process of microalloying + solid solution-aging is obtained. Fine second phases with high density precipitation, such as in Mg-Zn alloys, the size and morphology of precipitates are controlled by microalloying elements such as Ag, Ca, Zr and solid solution-aging heat treatment process, but for a large number of eutectic There are few reports on the design of magnesium alloy materials with microstructure or even complete eutectic microstructure

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