Electromagnetic/ultrasonic preparation method of in-situ particle reinforced magnesium-based composite material
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A composite material and particle reinforcement technology, which is applied in the field of metallurgy, can solve the problems of easy segregation, high cost, and low strength of the magnesium alloy matrix, and achieve the effects of simple preparation process, improved reinforcement effect, and low production cost
Inactive Publication Date: 2009-12-23
DALIAN UNIV OF TECH
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[0006] The invention provides an electromagnetic/ultrasonic preparation method for in-situ particle reinforced magnesium-based composite materials, which aims to solve the problem of low strength of the magnesium alloy matrix, poor
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Embodiment 1
[0014] Step 1. Smelting ZK60 magnesium alloy, heating up to 780°C, adding 1% rare earth Y element, keeping the temperature for 20 minutes, cooling down to 680°C, adding 1% Ca element, keeping the temperature for 20 minutes, and raising the temperature to 720°C.
[0015] Step 2. Select Al-Ti-C reinforcement system. The Al content is 50%, and the molar ratio of Ti and C is Ti:C=1:1. After vacuum ball milling for 8 hours, it is pressed into a prefabricated block, and preheated at 550° C. for 3 hours. The prefabricated block was added to the ZK60 magnesium alloy melt at 750 °C to cause a self-propagating high-temperature reaction, and TiC reinforced particles were synthesized in situ. When the alloy melt was cooled to 680°C, a 5kW, 15Hz electromagnetic field and a 300W, 20kHz ultrasonic field were applied to stir the melt for 30 minutes, and a magnesium-based composite melt with a relatively uniform distribution of reinforcement phase was obtained.
[0016] Step 3, using a semi-c...
Embodiment 2
[0018] Step 1. Melt AZ31 magnesium alloy, heat up to 780°C, add 1% rare earth Y element, keep warm for 20 minutes, cool down to 680°C, add 1% Ca element, keep warm for 20 minutes, and heat up to 760°C.
[0019] Step 2. Select Al-Ti-C reinforcement system. The Al content is 50%, and the molar ratio of Ti and C is Ti:C=1:1. After vacuum ball milling for 8 hours, it is pressed into a prefabricated block, and preheated at 550° C. for 3 hours. The prefabricated block was added to the AZ31 magnesium alloy melt at 760°C to cause a self-propagating high-temperature reaction, and TiC reinforced particles were synthesized in situ. When the alloy melt was cooled to 720°C, a 15kW, 50Hz electromagnetic field and 800W, 20kHz ultrasonic field were applied to the melt for 15min to stir, and a magnesium matrix composite melt with a relatively uniform distribution of reinforcement phase was obtained.
[0020] Step 3, using a semi-continuous casting method to prepare a continuous casting slab o...
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Abstract
An electromagnetic/ultrasonic preparation method of an in-situ particle reinforced magnesium-based composite material belongs to the technical field of metallurgy. The invention discloses a method for preparing the magnesium-based composite material with an electromagnetic continuous casting method, which is characterized by comprising the following steps of: melting a magnesium-based melt added with micro-alloying elements of Ca, rare earth Y, rare earth Ce; selecting an Al-Ti-C or Al-Ti-B reinforced system, adopting a self-propagating high-temperature synthesis method to synthesize a magnesium-based composite material melt containing reinforced particles in situ, and implementing electromagnetic/ultrasonic combined stirring to the magnesium-based composite material melt; and finally adopting a continuous casting process to form the magnesium-based composite material by continuous casting, and applying an electromagnetic field and an ultrasonic field within the range of a crystallizer so as to obtain a multi-phase reinforced magnesium-based composite material continuous-casting billet. The electromagnetic/ultrasonic preparation method has the effects and advantages of organically combining the self-propagating reaction method with the electromagnetic continuous casting technology and the ultrasonic technology, obtaining the magnesium-based composite material continuous-casting billet with smooth surface, uniform distribution of particle reinforcement phases in the basal body and good combination of the reinforced bodies and the basal body, and having simple preparation process.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for preparing magnesium-based composite materials, in particular to a method for preparing magnesium-based composite materials by continuous casting technology. Background technique [0002] Magnesium-based composites are multiphase materials that introduce reinforcements into the magnesium alloy matrix to play a reinforcing role. The introduction of reinforcement not only significantly improves the specific modulus, specific strength and creep properties of the matrix material, but also increases the service temperature of the magnesium alloy, which can meet the needs of the continuous development of aerospace structural materials. [0003] Magnesium matrix composites are mainly divided into two categories: continuous fiber reinforced magnesium matrix composites and discontinuous particle reinforced magnesium matrix composites. Continuous fiber-reinforced magnesium-ba...
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