Mg-Si-Ca-Zn series magnesium alloy and preparation method and application thereof
A mg-si-ca-zn, magnesium alloy technology, applied in metal rolling, metal processing equipment, manufacturing tools, etc., can solve the problems of low mechanical properties, toxicity, etc.
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Embodiment 1
[0062] Embodiment 1, preparation cast state Mg-Si-Ca-Zn series magnesium alloy
[0063] Using pure Mg (99.99wt.%), pure Si (99.95wt.%), pure Ca (99.95%) and pure Zn (99.99wt.%) as raw materials, according to different mass ratios (Mg, Si, Ca, Zn The mass ratios are 96.8:0.2:1.0:2.0, 97.3:0.2:0.5:2.0, 95.8:0.2:1.0:3.0, 96.3:0.2:0.5:3.0, 96.6:0.4:1.0:2.0, 97.1:0.4:0.5: 2.0, 95.6:0.4:1.0:3.0, 96.1:0.4:0.5:3.0) mix, in CO 2 +SF 6 Under the protection of the atmosphere, smelt at 750°C. After the raw materials are fully melted and kept warm for 20 minutes, they are poured into graphite molds preheated to 250°C to obtain Mg-Si-Ca-Zn series magnesium alloy ingots. Among them, Mg-0.2Si- 1.0Ca-2.0Zn means that the mass ratios of Mg, Si, Ca, and Zn are 96.8:0.2:1.0:2.0, respectively. Cooling to room temperature was then carried out by furnace cooling.
Embodiment 2
[0064] Embodiment 2, preparation extruded state Mg-Si-Ca-Zn series magnesium alloy
[0065] First, the as-cast Mg-Si-Ca-Zn series magnesium alloy was prepared according to the steps in Example 1, and the Mg-Si-Ca-Zn series magnesium alloy rod was prepared by extrusion, and the radial extrusion was adopted to cast Mg-Si-Ca-Zn series magnesium alloy rods with a diameter of 10mm were prepared by holding the ingot for 4h before extrusion, holding temperature 280°C, extrusion temperature 300°C, extrusion ratio 36, extrusion speed 1mm / s.
Embodiment 3
[0066] Embodiment 3, Mg-Si-Ca-Zn series magnesium alloy microstructure analysis:
[0067] The Mg-Si-Ca-Zn series magnesium alloy in Example 1 was prepared by wire-cutting a φ10×2mm sample, which was sequentially ground and polished by 400#, 800#, 1200# and 2000# SiC sandpaper series. After ultrasonic cleaning in acetone, absolute ethanol and deionized water for 15 min, dry at 25 °C. The sample was subjected to X-ray diffraction analysis, etched with 4% nitric acid alcohol for 5-30 seconds, washed with deionized water, dried, and observed under a metallographic microscope.
[0068] figure 1 It is the metallographic phase of Mg-Si-Ca-Zn magnesium alloy. It can be seen from the figure that after extrusion treatment, the grain size is significantly reduced, and the second phase is evenly distributed. Among them, Mg-0.4Si-0.5Ca-2.0 The grains of Zn alloy and Mg-0.4Si-0.5Ca-3.0Zn alloy are larger than those of other alloys, and the content of the second phase is less. When the co...
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