A method to control the mechanical properties of magnesium alloys by using grain boundary stability
A magnesium alloy, stability technology, applied in the field of magnesium alloy manufacturing, can solve the problems of low strength at room temperature, poor plastic deformation ability, etc., and achieve the effect of stable mechanical properties, high uniformity of structure, and less material consumption
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Embodiment 1
[0031] Step 1: Alloy Melting
[0032] Commercially purchased pure magnesium (purity 99.9%) was directly used for subsequent heat treatment without smelting.
[0033] The second step: solution treatment
[0034] Put pure magnesium into a box-type resistance furnace with a temperature of 500°C, keep it warm for 30 minutes, then take it out and put it in water for rapid cooling.
[0035] The third step: severe plastic deformation treatment
[0036] Process pure magnesium into sheet samples with a diameter of 30mm and a thickness of 0.80-0.85mm, put them between the upper and lower chucks of a high-pressure torsion machine, and perform high-pressure torsion treatment at room temperature. During the high-pressure torsion process, the pressure applied to the sample is 2GPa, the torsion speed is 0.2r / min, and the number of torsion circles is 5. Through high-pressure torsion treatment, an ultra-fine grain structure with an average grain size of 0.5 μm was obtained in the sample. T...
Embodiment 2
[0039] Step 1: Alloy Melting
[0040] Put the commercially purchased pure magnesium (purity 99.9%) dried and preheated at 150°C into a resistance furnace and heat it up to 720°C for melting. After the pure magnesium is completely melted, add Mg-Y master alloy and raise the temperature to 750°C , after the Mg-Y intermediate alloy is completely melted, stir evenly, cool down to 720°C and let it stand for 20 minutes, and finally cast it into a steel mold preheated to 200°C to obtain a low-alloyed Mg-Y binary alloy, in which Y element The content is 0.3 atomic %. In particular, during the smelting process, a mixed gas of nitrogen and sulfur hexafluoride is injected into the melt to prevent oxidation and combustion of the alloy.
[0041] The second step: solution treatment
[0042] Put the cast alloy into a box-type resistance furnace at a temperature of 500°C, keep it warm for 30 minutes, and then take it out and put it into water for rapid cooling.
[0043] The third step: sev...
Embodiment 3
[0047] Step 1: Alloy Melting
[0048] Put the commercially purchased pure magnesium (purity 99.9%) dried and preheated at 150°C into a resistance furnace and heat it up to 720°C for melting. After the pure magnesium is completely melted, add Mg-Y master alloy and raise the temperature to 750°C , after the Mg-Y intermediate alloy is completely melted, stir evenly, cool down to 720°C and let it stand for 20 minutes, and finally cast it into a steel mold preheated to 200°C to obtain a low-alloyed Mg-Y binary alloy, in which Y element The content is 0.3 atomic %. In particular, during the smelting process, a mixed gas of nitrogen and sulfur hexafluoride is injected into the melt to prevent oxidation and combustion of the alloy.
[0049] The second step: solution treatment
[0050] Put the cast alloy into a box-type resistance furnace at a temperature of 500°C, keep it warm for 30 minutes, and then take it out and put it into water for rapid cooling.
[0051] The third step: sev...
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