Rare-earth element samarium alloying 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, machinability, low mechanical properties, etc.

Active Publication Date: 2013-12-18
优标易站(苏州)电子商务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alloy has low mechanical proper

Method used

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  • Rare-earth element samarium alloying aluminum-silicon alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add the Al-Si alloy containing 9.0% (weight percentage) of silicon into the graphite crucible and heat it until it is completely melted. Add the Al-Sm master alloy at 780°C and keep it warm for 5 minutes, wherein the rare earth element Sm accounts for 0.05% 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 with a cooling rate of 40°C / min forming.

Embodiment 2

[0016] Add the Al-Si alloy with silicon content of 9.3% (weight percentage) into the graphite crucible and heat until it is completely melted, add the rare earth element Sm metal at 790°C and keep it warm for 6 minutes, wherein the rare earth element Sm 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 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 and kept for 61 minutes, and then cast in a metal mold with a cooling rate of 60°C / min forming.

Embodiment 3

[0018] Add the Al-Si alloy with silicon content of 9.6% (weight percentage) into the graphite crucible and heat until it is completely melted, add the rare earth element Sm metal at 780°C and keep it warm for 8 minutes, wherein the rare earth element Sm accounts for 0.12% 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 with a cooling rate of 40°C / min forming.

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Abstract

The invention relates to a rare-earth element samarium alloying aluminum-silicon alloy and a preparation method thereof. The alloy comprises the following components in percentage by weight: 9.0-9.8% of silicon, 0.05-0.4% of samarium and the balance of aluminum. The preparation method comprises the following steps: heating an Al-Si alloy in a graphite crucible to be molten, adding samarium or an aluminum-samarium intermediate alloy according to the weight percents at 770-790 DEG C, and keeping the temperature for 5-8 minutes; performing intermittent ultrasonic treatment on the molten alloy under the conditions that the ultrasonic strength is 10-38 w/cm<2>, the total ultrasonic treatment time is 3-8 minutes, the ultrasonic time of each time is 20-30 seconds and the intermittence time is 20-30 seconds; and cooling the molten alloy to 720-740 DEG C, keeping the temperature for 31-180 minutes, and solidifying at a cooling rate of 40-65 DEG C/min. According to the invention, the refinement and nodularization of an alpha-Al phase can be obviously accelerated; acicular eutectic silicon is changed into punctate or stick-like silicon, and the distribution is more disperse and uniform, thus ensuring that the microscopic structure and mechanical property of the aluminum alloy are obviously improved; the process is simple, safe, reliable and convenient to operate, and has no pollution caused by three wastes.

Description

technical field [0001] The invention belongs to the technical field of aluminum-silicon alloy and its preparation. Background technique [0002] Aluminum-silicon (Al-Si) alloy has excellent casting performance, no thermal cracking and looseness, and high air tightness. Its density is small, corrosion resistance is good, and it can withstand the atmosphere. Used in seawater corrosive environments, can withstand concentrated nitric acid in industrial atmospheres. The corrosion effect of oxygen peroxide, etc.; the welding performance is also good. However, the alloy has low mechanical properties, poor heat resistance and machinability. [0003] Rare earth elements have unique electronic layer structure and physical and chemical properties, unique 4f electronic structure, large atomic magnetic moment, and strong spin coupling characteristics, and their influence on aluminum alloys is also quite unique. The modification of rare earth elements has the characteristics of long-t...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22B9/02
CPCY02P10/20
Inventor 胡志闫洪阮先明华群魏仕勇
Owner 优标易站(苏州)电子商务有限公司
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