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

A magnesium-aluminum alloy and crystal structure technology, which is applied in the field of alloy preparation, can solve the problems of not considering the potential difference between titanium and magnesium, deterioration of magnesium-aluminum alloy corrosion resistance, galvanic corrosion, etc., to achieve coarse grain size, improve corrosion resistance, The effect of increasing content

Active Publication Date: 2018-12-07
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

At present, the relevant researches are mainly focused on the preparation of titanium-containing nanocrystalline magnesium alloys by cold pressing and sintering after mechanical alloying, in which titanium particles are dispersed as the second phase particles to strengthen the mechanical properties of magnesium alloys, but the content of titanium added by this method is relatively high , does not consider the large potential difference between titanium and magnesium, which will form a strong galvanic corrosion and deteriorate the corrosion resistance of magnesium and aluminum alloys

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

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Embodiment 1

[0026] Using titanium powder and AZ61 powder as raw materials, weigh 0.05g titanium metal powder (purity>99%, particle size 20-60nm) and 9.95g AZ61 powder (purity>99.9%, particle size 40- 80 μm), placed in a ball mill, and fed with high-purity argon, set the rotation speed at 300rad / min, and the ball milling time was 6h, to obtain uniformly dispersed titanium / AZ61 mixed powder. Under the protection of high-purity argon with a purity of 99.999%, under the parameters of laser power 90W, scanning speed 250mm / min, and spot diameter 90μm, the corrosion-resistant magnesium-aluminum alloy was prepared by SLM process.

[0027] Microstructure tests found that 0.5wt.% titanium refined the grain size of AZ61-Ti, and the Mg in the alloy 17 Al 12 phase was greatly reduced, a continuous eutectic phase was formed, and no aggregation of titanium was detected ( figure 1 ); XRD test found ( figure 2 ), Mg 17 Al 12 The corresponding characteristic peaks become weaker, indicating that Mg 1...

Embodiment 2

[0029] Using titanium metal powder and AZ61 powder as raw materials, weigh 0.1g titanium powder (purity>99%, particle size 20-60nm) and 9.9g AZ61 powder (purity>99.9%, particle size 40-60nm) according to the mass ratio of 0.01:0.99 80 μm), placed in a ball mill, and fed with high-purity argon, set the rotation speed at 300rad / min, and the ball milling time was 6h, to obtain uniformly dispersed titanium / AZ61 mixed powder. Under the protection of high-purity argon with a purity of 99.999%, under the parameters of laser power 90W, scanning speed 250mm / min, and spot diameter 90μm, the corrosion-resistant magnesium-aluminum alloy was prepared by SLM process.

[0030] Microstructural tests found that ( figure 1 ), 1.0wt.% titanium completely consumed the coarse Mg in AZ61 17 Al 12 Phase, a large number of eutectic phases were generated, and it was found that a new second phase containing titanium was generated at the grain boundary; XRD test found that ( figure 2 ), the titanium-c...

Embodiment 3

[0032] Using titanium powder and AZ61 powder as raw materials, weigh 0.05g titanium metal powder (purity>99%, particle size 20-60nm) and 9.95g AZ61 powder (purity>99.9%, particle size 40- 80 μm), placed in a ball mill, and fed with high-purity argon, set the rotation speed at 300rad / min, and the ball milling time was 6h, to obtain uniformly dispersed titanium / AZ61 mixed powder. Under the protection of high-purity argon with a purity of 99.999%, under the parameters of laser power 75W, scanning speed 250mm / min, and spot diameter 90μm, the corrosion-resistant magnesium-aluminum alloy was prepared by SLM process.

[0033] The microstructure test found that the corrosion-resistant magnesium-aluminum alloy prepared under 75W power had a small amount of pores, and a small amount of magnesium-aluminum alloy powder was not completely melted. Electrochemical tests found that the corrosion potential from -1.44mV SCE down to -1.24mV SCE , reduces its corrosion current, increases impeda...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/04
CPCC22C1/0408C22C23/02
Inventor 高成德帅词俊
Owner CENT SOUTH UNIV
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