A Method for Improving the High Temperature Creep Resistance of Rare Earth Magnesium Alloys Using High Density Precipitation Free Zones
A rare-earth magnesium and high-density technology is applied in the field of improving the high-temperature creep resistance of rare-earth magnesium alloys. It can solve the problems that the creep resistance cannot be significantly improved, the no-precipitation zone cannot be effectively avoided, and the effect is minimal, and a breakthrough anti-corrosion Creep performance improvement effect, beneficial to environmental protection, and wide application range
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Embodiment 1
[0032] In this embodiment, the raw material is a hot-rolled Mg-6Y-2Nd-0.4Zr alloy, and the mass percentage of the Y element is 52% of its solid solution limit in the Mg matrix. After solid solution, its average grain size is about 100μm. A sample of the alloy was subjected to aging treatment and water quenching at 230° C. for 20 h. For comparison, another sample was not subjected to aging treatment. Subsequently, the two samples were heated to the creep temperature of 280°C and held for 20 minutes.
[0033] The sample structure after heat preservation is as follows: figure 1 As shown, among them, figure 1 (a) is the structure of the aging sample after heat preservation, and more than 90% of the crystal grains contain no precipitation zone at the grain boundary; figure 1 (b) is the microstructure of the unaged sample after heat preservation, the non-precipitation zone is unevenly distributed in some grains, and the percentage of the number of grains containing the non-preci...
Embodiment 2
[0036]In this embodiment, the raw material is a hot-rolled Mg-13Gd-3Y-0.1Zn-0.2Zr alloy, and the mass percentage of Gd element is 57% of its solid solution limit in the Mg matrix. After solid solution, its average grain size is about 100μm. The alloy was subjected to aging treatment at 220°C for 20h, water quenching, and then heated to a creep temperature of 250°C, and one sample of the alloy was kept warm for 20min, and the other was kept warm for 50min.
[0037] The sample structure after heat preservation is as follows: image 3 As shown, among them, image 3 (a) is the structure of the sample kept at 20min, more than 90% of the crystal grains contain no precipitation zone, image 3 (b) is the microstructure of the sample kept at 50min, only 10% of the crystal grains contain non-precipitation zones, and the distribution of non-precipitation zones is uneven.
[0038] The tensile creep properties of the two samples were tested at 250°C and 80MPa, and the results are as fol...
Embodiment 3
[0040] The raw materials used in this embodiment are hot-rolled Mg-14Gd-0.3Zn alloy and hot-rolled Mg-8Gd-8Er-4Y-0.3Zn alloy. Among them, the mass percentage of the former Gd element is 62% of its solid solution limit in the Mg matrix, while the latter's rare earth element mass percentage is below 40% of the solid solution limit. After solid solution, the average grain size of both alloys is about 100 μm. The two alloys were subjected to aging treatment and water quenching at 220°C for 24h, and then heated to a creep temperature of 250°C and kept for 30min.
[0041] The sample structure after heat preservation is as follows: Figure 5 As shown, among them, Figure 5 (a) is the structure of the Mg-14Gd-0.3Zn sample, more than 85% of the crystal grains contain no precipitation zone, Figure 5 (b) is the structure of the Mg-10Gd-10Er-5Y-0.3Zn sample, only 60% of the crystal grains contain no precipitation bands, and the distribution of the no precipitation bands is uneven.
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