Extrusion deformation damping aluminum-magnesium alloy and preparation method
A magnesium alloy and damping technology, which is used in metal extrusion control equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of the same composition or invention and no patent disclosure, etc. The effect of low air permeability
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Embodiment 1
[0039] Example 1: With Al ingot and Mg ingot with a purity of 99.95%, Mg-La master alloy ingot as raw materials, Al ingot, Mg ingot and master alloy ingot are divided, degreased, dried and descaled to obtain block material, wherein In the Mg-La master alloy ingot containing rare earth lanthanum, La accounts for 13.5wt%, the total amount of impurity elements Fe, Ni, Cu and Si is less than 0.02wt%, and the aluminum balance; according to the general formula Al-10wt% Mg-0.8wt% La ratio for weighing and batching; the prepared charge is loaded into the graphite crucible, and when the furnace temperature of the resistance furnace reaches 790°C, put the graphite crucible with the charge into the resistance furnace to heat until all the charge is melted, and the crucible is put into Resistance furnace, then immediately pour KCl molten salt accounting for 10% of the weight of the metal charge on the surface of the metal charge in the crucible to cover the upper surface of the metal charg...
Embodiment 2
[0046] Example 2: The difference from Example 1 is that: 1. Weighing and batching are carried out according to the formula Al-10wt%Mg-0.3wt%La; 2. The preheating temperature of the extrusion blank is 370°C; 430 ° C; ④ extrusion ratio of 28.3. All the other steps and conditions are the same as in Example 1.
[0047] At room temperature and resonance frequencies of 20Hz, 40Hz, 60Hz, 80Hz and 100Hz, the damping coefficients (tanδ) of extrusion blanks are: 0.0001, 0.0067, 0.0059, 0.0049 and 0.0013, respectively.
[0048] At room temperature and resonance frequencies of 20Hz, 80Hz and 100Hz, the damping coefficients (tanδ) of extruded strips obtained directly from industrial extruders are: 0.0129, 0.0051 and 0.0044.
[0049] At room temperature, the main mechanical index of Al-10wt%Mg-0.3wt%La extrusion blank is: tensile strength (σ b ) is 180MPa, the elongation is 1.7%, and the Brinell hardness is 74HB.
[0050] At room temperature, Al-10wt%Mg-0.3wt%La is directly extruded by a...
Embodiment 3
[0051] Embodiment 3: The difference from Example 1 is: 1. Weighing and batching according to the formula Al-10wt%Mg-0.02wt%La proportioning; 2. The preheating temperature of the extrusion blank is 350 ° C; 420 ℃; ④ extrusion ratio of 18.1; ⑤ extruded industrial strip. All the other steps and conditions are the same as in Example 1.
[0052] At room temperature and resonance frequencies of 20Hz, 40Hz, 60Hz, 80Hz and 100Hz, the damping coefficients (tanδ) of Al-10wt%Mg-0.02wt%La extrusion blanks are: 0.0084, 0.0137, 0.0089, 0.0060 and 0.0051, respectively.
[0053] At room temperature and resonance frequency of 20Hz, 60Hz and 100Hz, the damping coefficients (tanδ) of Al-10wt%Mg-0.02wt%La extruded strips obtained by direct extrusion of industrial extruders are: 0.0012, 0.0002 and 0.0001.
[0054] At room temperature, the main mechanical index of Al-10wt%Mg-0.02wt%La extrusion blank is: tensile strength (σ b ) is 178MPa, the elongation is 2.2%, and the Brinell hardness is 64HB....
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