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通过碱液清洗粉末净化B4C颗粒,以改善其在Mg-Li基体中的分散特性。结果表明:经过预处理后粉末中超细颗粒明显减少,B2O3含量减少,B4C粉末颗粒表面更加洁净。采用经碱洗处理后的B4C粉末制备出的高锂低熔点预混合金拉伸强度与密度均有提高。最后按Mg-15Li-2Al-6B4C成分配比制备的B4C/Mg-Li复合材料金相组织中B4C粉末聚团明显减少,组织更加均匀,与用未处理B4C粉末制备的B4C/Mg-Li复合材料相比,其拉伸强度提高21.53%。对B4C粉末的碱洗预处理有效地提高了原位生成硼化物对B4C/Mg-Li复合材料的强化效果。
The B4C particles were cleaned with lye cleaning powder to improve their dispersion characteristics in the Mg-Li matrix. The results showed that after the pretreatment, the ultrafine particles in the powder decreased obviously and the content of B2O3 decreased. The surface of B4C powder particles was cleaner. The tensile strength and density of high-lithium, low-melting-point pre-mixed gold prepared by alkali-treated B4C powder all increased. Finally, the agglomeration of B4C powder in B4C / Mg-Li composites prepared by the Mg-15Li-2Al-6B4C composition ratio was significantly reduced and the microstructure was more uniform. Compared with the B4C / Mg-Li prepared by the untreated B4C powder Compared with the material, its tensile strength increased by 21.53%. The alkaline washing pretreatment of B4C powder effectively enhanced the strengthening effect of in situ boride formation on B4C / Mg-Li composites.