电磁搅拌合成(Al2O3+Al3Zr)p/Al复合材料的净化机制与性能
Mechanism and Properties of Fabricating and Cleaning-up for (Al2O3+Al3Zr)p/Al Composites with Electromagnetic Stirring
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摘要: 在电磁搅拌条件下,通过Al-Zr(CO3)2熔体原位反应法,合成了Al2O3、Al3Zr颗粒增强铝基复合材料,对材料的组织和性能进行了研究.结果表明：由于电磁搅拌能促进铝热反应固液两相的传质和扩散,改善了原位合成动力学条件,采用电磁搅拌合成的复合材料中增强相颗粒在基体中的体积分数和弥散度都较未施加电磁搅拌时有了明显提高,浇注缺陷明显减少,铝基体得到净化;当Zr(CO3)2加入量为20％时,所获复合材料抗拉强度达202.6MPa,较未施加电磁搅拌的强度提高了34.8％.Abstract: Under the condition of electromagnetic stirring(EMS),the composites of Al2O3、Al3Zr particulates reinforced aluminum matrix was synthesized by Al-Zr(CO3)2 components through the direct melt in-situ reaction method.The microstructure and properties of composites were studied.The mass transfer and diffuseness in solid-liquid phases could be accelerated by EMS and in-situ reactions were improved largely.The fraction volume of particulates in aluminum matrix was enhanced and the particulates were well distributed in the matrix.Casting defects were dramatically decreased,which led to a high cleanness of aluminum matrix.When the added amount of Zr(CO3)2 was 20%,the tensile strength was 202.6MPa,which was increased by 34.8％ compared to that of samples fabricated without electromagnetic stirring.
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