Magnesium-aluminum alloy with continuous eutectic structure and preparation method thereof

Abstract

The invention discloses a magnesium-aluminum alloy with continuous eutectic structure and a preparation method thereof, and the alloy is composed of a magnesium-aluminum alloy matrix and a continuouseutectic phase distributed at the grain edge of the matrix. The preparation method comprises the following steps that (1) nano-sized titanium powder and the magnesium-aluminum alloy powder are placedin a ball mill, and ball milling is conducted under protective atmosphere to obtain the mixed powder; and (2) the mixed powder is used as a raw material, and the magnesium-aluminum alloy with the continuous eutectic structure is prepared through selective laser melting under the protective atmosphere. According to the preparation method, the titanium is introduced in the magnesium-aluminum alloy preparation process, aluminum atoms in a molten pool are attracted to migrate, and eutectic reaction is generated on the edge of the crystal grain to generate the continuous eutectic phase; meanwhile,the characteristic that the selective laser melting solidification speed is high is utilized, the formation of the continuous eutectic phase is promoted while the content of a second phase Mg17Al12 isreduced, so that galvanic corrosion effect of the magnesium aluminum alloy is effectively weakened, and the corrosion resistance of the magnesium-aluminum alloy is improved; and meanwhile, better interface combination is achieved, so that the mechanical property of the magnesium-aluminum alloy is improved.

Description

technical field

[0001] The invention belongs to the technical field of alloy preparation and relates to an aluminum-magnesium alloy, in particular to a magnesium-aluminum alloy with a continuous eutectic structure and a preparation method thereof. Background technique

[0002] As a potential biomedical implant material, magnesium and its alloys can overcome the disadvantages of poor mechanical compatibility and non-degradability of metals such as stainless steel and cobalt alloys, and the magnesium ions produced by its degradation are not only important cations in the human body, but also A cofactor for several enzymes that has been shown to promote bone formation. Therefore, how to design and develop metal implants that meet the requirements of tissue repair by using the characteristics of magnesium alloys that can be corroded and degraded in vivo has become a research hotspot in this field. Among the many types of magnesium alloys, magnesium-aluminum alloys have relativel...

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