A method for preparing needle-like second phases to improve the degradation resistance of medical magnesium alloys
A magnesium alloy and needle-like technology is applied in the field of preparing needle-like second phase to improve the degradation resistance of medical magnesium alloys, and can solve the problems of affecting the growth and healing of damaged bones, decreasing mechanical properties, and low potential.
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Embodiment 1
[0027] Weigh 9.88 grams of AZ61 powder (particle size 50-80 μm) and 0.12 grams of rare earth element Ce powder (particle size 1-5 μm), place the two in a ball mill, and ball mill them under a protective atmosphere to obtain a uniformly mixed powder. 350 rpm, ball milling time 3 hours. Using the above mixed powder as raw material, the acicular Al-containing 4 Ce-phase medical magnesium alloy; during the preparation process, the laser power is controlled to 90W, the scanning speed is 300mm / min, and the spot diameter is 80μm.
[0028] The test found that fine grains and needle-like Al were formed in the prepared alloy 4 Ce phase, Al 4 The Ce phase is distributed uniformly and dispersed inside the grains, and at the same time it refines and reduces the Mg 17 Al 12 The precipitation of the second phase ( figure 1 ). Electrochemical tests found that, compared with the AZ61 alloy, the needle-like Al 4 The corrosion current of Ce-phase magnesium alloy is 40.91μA / cm from AZ61 2...
Embodiment 2
[0030] Weigh 9.88 grams of AZ61 powder (particle size 50-80 μm) and 0.12 grams of rare earth element Ce powder (particle size 1-5 μm), place the two in a ball mill, and ball mill them under a protective atmosphere to obtain a uniformly mixed powder. 350 rpm, ball milling time 3 hours. Using the above mixed powder as raw material, the acicular Al-containing 4 Ce-phase medical magnesium alloy; during the preparation process, the laser power is controlled to 70W, the scanning speed is 300mm / min, and the spot diameter is 80μm.
[0031] The test found that fine grains and needle-like Al were formed in the prepared alloy 4 Ce phase, Al 4 The Ce phase is distributed uniformly and dispersed inside the grains, and at the same time it refines and reduces the Mg 17 Al 12 Precipitation of the second phase. Electrochemical tests found that, compared with the AZ61 alloy, the corrosion current of the magnesium alloy containing the needle-like Al4Ce phase increased from 40.91μA / cm 2 Red...
Embodiment 3
[0033] Weigh 9.76 grams of AZ61 powder (particle size 50-80 μm) and 0.24 grams of rare earth element Ce powder (particle size 1-5 μm), place the two in a ball mill, and ball mill them under a protective atmosphere to obtain a uniformly mixed powder. 350 rpm, ball milling time 3 hours. Using the above mixed powder as raw material, the acicular Al-containing 4 Ce-phase medical magnesium alloy; during the preparation process, the laser power is controlled to 90W, the scanning speed is 300mm / min, and the spot diameter is 80μm.
[0034] The test found that fine grains and needle-like Al were formed in the prepared alloy 4 Ce phase, Al 4 The Ce phase is distributed uniformly and dispersed inside the grains, and at the same time it refines and reduces the Mg 17 Al 12 Precipitation of the second phase. Electrochemical tests found that, compared with the AZ61 alloy, the needle-like Al 4 The corrosion current of Ce-phase magnesium alloy is 40.91μA / cm from AZ61 2 Reduced to 22.34μ...
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