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-2A1—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134C／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。
Alkaline solution treatment was used to purify B4C powder and enhance the wetting ability between the B4 C powder and the Mg - Li matrix. The results show that both of the specific surface and B2O3 decrease. Tensile strength and density of the pre-mixed alloy prepared by the B4C powder after alkaline treatment increase. Fewer agglomerates and uniform formation are proved in the metallographic structure of the B4 C/Mg- Li composite （Mg- 15Li- 2A1- 6B4 C）. The tensile strength of B4C/Mg- Li composite increases 21.53% compared with that prepared by B4 C without alkaline solution treatment. Results indicate that the alkaline solution treatment of B4 C powder can improve the strengthening effect of the boride in situ reacted in the B4C/Mg- Li composite.
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