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BN与LPSO相混杂增强的镁基复合材料制备及性能

Preparation and Properties of BN and LPSO Hybrid Reinforced Magnesium Matrix Composite
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摘要 研究了六方氮化硼(h-BN)颗粒增强镁基复合材料的制备工艺及其性能。通过化学镀法在h-BN颗粒表面包覆一层纯镍,镀镍处理能显著改善h-BN与镁合金熔体的润湿性,改善其与基体的界面结合。通过向基体合金中加入Y元素,利用镀镍层熔入熔体中的Ni获得了由Mg-Ni-Y组成的LPSO结构(长周期堆垛有序结构),制得了h-BN+LPSO混杂增强的镁基复合材料。超声处理后,hBN增强相体积分数为3%的镁基复合材料热导率为99.92W/(m·K),室温(RT)至100℃的平均热膨胀系数为18.36×10^(-6)K^(-1),抗拉强度为171MPa,伸长率为3.9%,获得了兼具较高力学性能和优异热物性能的镁合金材料。 The preparation process and properties of hexagonal boron nitride(h-BN)particle reinforced magnesium matrix composites were investigated.A thin layer of pure nickel was coated on the surface of h-BN particles by electroless plating,which can significantly improve the wettability between h-BN and magnesium alloy melt and strengthen the interface bonding with the matrix.By adding Y element to magnesium alloy and consume Ni element fused with the nickel-plating layer,the long period stacking ordered(LPSO)structure composed of Mg-NiY can be successfully formed,and the magnesium matrix composite reinforced by hybrid h-BN and LPSO structure is obtained.After ultrasonic treatment(UT),the thermal conductivity(TC)of the magnesium composite containing 3%h-BN reaches 99.92 W/(m·℃),and the average coefficient of thermal expansion(CTE)of the composite from room temperature(RT)to 100℃is 18.36×10^(-6)K^(-1).The tensile strength and elongation of the composites reach 171 MPa and 3.9%,respectively.The magnesium alloy material with both high mechanical properties and excellent thermal properties was obtained.
作者 夏岚清 吴树森 吕书林 郭威 李建宇 李成 Xia Lanqing;Wu Shusen;Lü Shulin;Guo Wei;Li Jianyu;Li Cheng(State Key Laboratory of Materials Processing and Die&Mould Technology\School of Materials Science and Engineering\Huazhong University of Science and Technology)
出处 《特种铸造及有色合金》 CAS 北大核心 2021年第2期214-218,共5页 Special Casting & Nonferrous Alloys
基金 国家自然科学基金资助项目(51771080) 基础科研计划资助项目(JCKY2016209A001)。
关键词 镁基复合材料 H-BN LPSO结构 热物性能 力学性能 Magnesium Matrix Composites h-BN LPSO Structure Thermal Properties Mechanical Properties
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