合金的名义成分为Mg-8.0Gd-4.5Y- Zn-0.4Zr（ =0

The nominal composition of the alloy of Mg-8.0Gd-4.5Y- Zn-0.4Zr (= 0,0.7,1.5,3%), melting the alloy in the intermediate frequency induction melting furnace, first pure Mg and pure Zn was added in a crucible, and treated with # 2 solvent protection, to be pure Mg with the pure Zn completely melted, added Mg-30Y at 780 ℃, Mg-30Gd intermediate alloy, continues to rise added Mg-30Zr intermediate alloy temperature to 800 deg.] C until completely melted after an Ar gas refining 20min, after semi-continuous casting was allowed to stand 60min, Φ160mm obtained ingot in a lathe to the outer skin, the final size of the ingot Φ155mm, the specific composition of the alloy as shown in table 1, according to the content of Zn small to large, labeled 0Zn, 0.7Zn, 1.5Zn and 3.3Zn alloy. <br>Using Carl Zeiss Axiovet 2000MAT metallographic microstructure observation microscope, etchant 4% nital, using spectra with Carl Zeiss EVO 18 scanning electron microscope phase analysis using Bruker D8 DISCOVER X-ray diffraction analysis of alloy phase composition, using a transmission electron microscope JEM-2000 transmission for histological analysis.

The nominal component of the alloy is Mg-8.0Gd-4.5Y-Zn-0.4Zr (-0,0.7,1.5,3%), alloy smelting is carried out on the medium frequency induction furnace, first adding pure Mg and pure Zn to the crucible, and protecting it with a solvent of 2 s, after pure Mg and pure Zn are completely melted, at 7 Add Mg-30Y, Mg-30Gd intermediate alloy, continue to raise the temperature to 800 degrees C when adding Mg-30Zr intermediate alloy, to be completely melted, using Ar gas refining 20min, set 60min after semi-continuous casting, get 160mm ingots, in the car car to peel off the skin, The final size of the ingot is 155mm, the specific composition of the alloy as shown in Table 1, according to the Zn content from small to large, marked as 0Zn, 0.7Zn, 1.5Zn and 3.3Zn alloys, respectively.<br>Tissue observation using Carl Zeiss Axiovet 2000MAT gold phase microscope, corrosion agent 4% nitric acid alcohol solution, photo analysis using Carl Zeiss EVO 18 scanning electron mirror with energy spectrum, use of Brook D8 DISCOVER X-ray diffraction instrument to analyze the composition of the alloy, using JEM-2000 electron electron microscope for transmission tissue analysis.

The nominal composition of the alloy is mg-8.0gd-4.5y-zn-0.4zr (= 0, 0.7, 1.5, 3%). The melting of the alloy is carried out in the medium frequency induction melting furnace. First, pure Mg and pure Zn are added into the crucible and protected by 2 × 3 solvent. After the pure Mg and pure Zn are completely melted, mg-30y and mg-30gd intermediate alloys are added at 780 ℃, mg-30zr intermediate alloy is added when the temperature continues to rise to 800 ℃, and mg-30zr intermediate alloy is added when the temperature is completely melted After that, Ar gas refining is used for 20min, and the semi continuous casting is carried out after standing for 60min to obtain the Φ 160mm ingot. The outer surface is removed on the lathe. The final size of the ingot is Φ 155mm. The specific composition of the alloy is shown in Table 1. According to the small to large content of Zn, it is respectively marked as 0zn, 0.7zn, 1.5zn and 3.3zn alloy.<br>The microstructure of the alloy was observed by Carl Zeiss axiovet 2000 mat metallographic microscope. The corrosion agent was 4% nitric acid alcohol solution. The phase analysis was carried out by Carl Zeiss Evo 18 scanning electron microscope equipped with energy spectrum. The phase composition of the alloy was analyzed by D8 discover X-ray diffractometer of Brooke company. The transmission structure was analyzed by jem-2000 transmission electron microscope.<br>