High-strength wrought magnesium alloy and preparation method thereof
A deformed magnesium alloy, high-strength technology, applied in the field of light metal materials, can solve the problems of high cost and insufficient strength, and achieve the effect of increasing strength, improving mechanical properties, and enhancing the effect of precipitation strengthening
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[0026] Example 1
[0027] A metal-type gravity casting is used to obtain a cube ingot with a side length of 200mm and a height of 150mm. After chemical analysis, its chemical composition is: Mg-2.0Zn-0.8Gd-0.7Ca-0.5Mn. Its as-cast structure is like figure 1 As shown in (a), the as-cast crystal grain size is 50-100 microns.
[0028] The alloy ingot was homogenized at 420°C for 16 hours; after the treatment, it was cut into billets for extrusion with a diameter of 50 mm. The extruding billet was kept at 380°C for 2 hours, and then put into an extrusion cylinder for extrusion to obtain an extruded rod with a diameter of 12 mm. The microstructure of the extruded rod is like figure 1 (b); The grains are refined to 2-5 microns after extrusion. According to the Hall-Petch relationship, the grain refinement will increase the strength of the alloy. The mechanical properties were tested according to the national standard GB / T228-2002, and the tensile strength was 418MPa, the yield strengt...
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[0029] Example 2
[0030] A metal-type gravity casting is used to obtain a cube ingot with a side length of 200mm and a height of 150mm. After chemical analysis, its chemical composition is: Mg-3.0Zn-0.2Gd-2.0Ca-0.2Mn-0.3Zr. Its as-cast structure is like figure 2 As shown in (a), the as-cast crystal grain size is 50-100 microns. As the Zn content increases, dendrites are formed and more second phases are produced.
[0031] The alloy ingots were homogenized at 400°C for 12 hours; after the treatment, they were cut into billets for extrusion with a diameter of 50 mm. The extruding billet was kept at 380°C for 2 hours, and then put into an extrusion cylinder for extrusion to obtain an extruded rod with a diameter of 12 mm. The microstructure of the extruded rod is like figure 2 (b); After extrusion, the grains are refined to 1-5 microns, and a lot of fine grain precipitated phases are produced, and the grain refinement and precipitation phase strengthening further improve the stre...
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[0032] Example 3
[0033] A metal-type gravity casting is used to obtain a cube ingot with a side length of 200mm and a height of 150mm. After chemical analysis, its chemical composition is: Mg-4.1Zn-3Y-0.2Ca-2.0Mn. Its as-cast structure is like image 3 As shown in (a), the as-cast crystal grain size is 50-100 microns. As the Zn content continues to increase, the number of dendrites increases and the number of second phases also increases.
[0034] The alloy ingots were homogenized at 380°C for 12 hours; after the treatment, they were cut into blanks for extrusion with a diameter of 50 mm. The extruding billet was kept at 380°C for 2 hours, and then put into an extrusion cylinder for extrusion to obtain an extruded rod with a diameter of 12 mm. The microstructure of the extruded rod is like image 3 (b); After extrusion, the grains are refined to 1-5 microns, and a lot of fine particle precipitation phases are produced, and there are also some coarse second phases. The grain ref...
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