High damping magnesium matrix composites containing bismuth stannate
A composite material and high damping technology, applied in the field of metal materials, can solve the problems of low damping of magnesium alloys, uneven distribution of reinforcement phases, etc., and achieve the effect of improving damping performance and uniform distribution
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Embodiment 1
[0015] The alloy composition (percentage by weight) of the present invention is: 8.55%Al, 0.48%Zn, 0.19%Mn, 5%Bi 2 o 3 2SnO 2 , the balance is Mg and unavoidable impurities. Prepare 40g of mixed powder according to the above ingredients, and the introduction of Al, Zn, and Mn is realized by adding AZ91 magnesium alloy powder. The weight percentages of Al, Zn, and Mn in AZ91 are 8.95%, 0.44%, and 0.21%, respectively. The magnesium-based composite material is prepared by powder metallurgy. The AZ91 powder with an average particle size of 105 μm is placed in a vacuum drying oven, and then the mixed powder is fully ball-milled and mixed by a high-energy ball mill under the protection of argon. The ball milling process is as follows: the rotating speed is 300r / min, the ball milling time is 6h, and the ball-to-material ratio is 5:1. Then, under the pressure of 20MPa, the ball-milled powder was hot-pressed and sintered at 550°C for 30min, and then cooled with the furnace, and arg...
Embodiment 2
[0018] The alloy composition (weight percentage) of the present invention is: 8.06%Al, 0.39%Zn, 0.17%Mn, 10%Bi 2 o 3 2SnO 2 , the balance is Mg and unavoidable impurities. Prepare 40g of mixed powder according to the above ingredients, and the introduction of Al, Zn, and Mn is realized by adding AZ91 magnesium alloy powder. The weight percentages of Al, Zn, and Mn in AZ91 are 8.95%, 0.44%, and 0.21%, respectively, and the manufacturing process is the same as in Example 1. When the composite material is at room temperature and the frequency is 1 Hz, the damping value of the material increases continuously with the increase of the amplitude, reaching a maximum of 0.072.
Embodiment 3
[0020] The alloy composition (weight percentage) of the present invention is: 8.32%Al, 0.43%Zn, 0.18%Mn, 8%Bi 2 o 3 2SnO 2 , the balance being Mg. Prepare 40g of mixed powder according to the above ingredients, and the introduction of Al, Zn, and Mn is realized by adding AZ91 magnesium alloy powder. The weight percentages of Al, Zn, and Mn in AZ91 are 8.95%, 0.44%, and 0.21%, respectively, and the manufacturing process is the same as in Example 1. When the composite material is at room temperature and the frequency is 1 Hz, the damping value of the material increases continuously with the increase of the amplitude, reaching a maximum of 0.078.
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