Rare earth element lanthanum alloyed aluminum-silicon alloy and preparation method thereof
A technology for alloying aluminum and rare earth elements, applied in the field of aluminum-silicon alloys and preparation, can solve the problems of poor heat resistance and machinability, low mechanical properties, etc., and achieve the effects of dispersed distribution, no three waste pollution, and convenient operation
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Embodiment 1
[0014] Add the Al-Si alloy containing 9.0% (weight percentage) of silicon into the graphite crucible and heat until it is completely melted, add the Al-La master alloy at 780 ° C and keep it warm for 5 minutes, wherein the rare earth element La accounts for 0.08% of the total weight of the alloy; Then extend the ultrasonic horn into the above alloy melt for intermittent ultrasonic treatment with an ultrasonic intensity of 10w / cm 2 , the total ultrasonic treatment time is 3 minutes, each ultrasonic time is 25 seconds, and the intermittent time is 25 seconds; finally, the alloy melt is lowered to 720 ° C and kept for 31 minutes, and then cast in a metal mold.
Embodiment 2
[0016] Add the Al-Si alloy containing 9.8% (weight percent) of silicon into the graphite crucible and heat it until it is completely melted, add the rare earth element La metal at 790 ° C and keep it warm for 6 minutes, wherein the rare earth element La accounts for 0.09% of the total weight of the alloy; then Extend the ultrasonic horn into the above alloy melt for intermittent ultrasonic treatment with an ultrasonic intensity of 20w / cm 2 , the total ultrasonic treatment time is 4 minutes, each ultrasonic time is 30 seconds, and the intermittent time is 20 seconds; finally, the alloy melt is lowered to 720 ° C for 61 minutes, and then cast in a metal mold.
Embodiment 3
[0018] Add the Al-Si alloy with silicon content of 12.0% (weight percentage) into the graphite crucible and heat until it is completely melted, add the rare earth element La metal at 780°C and keep it warm for 8 minutes, wherein the rare earth element La accounts for 0.14% of the total weight of the alloy; then Extend the ultrasonic horn into the above alloy melt for intermittent ultrasonic treatment with an ultrasonic intensity of 25w / cm 2 , the total ultrasonic treatment time is 5 minutes, each ultrasonic time is 20 seconds, and the intermittent time is 20 seconds; finally, the alloy melt is lowered to 720 ° C and kept for 181 minutes, and then cast in a metal mold.
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