采用机械合金化及热压方法制备了纳米晶Mg2Si块体材料,利用X射线衍射(XRD)、X射线能谱(EDS)分析、场发射扫描电镜(FE-SEM)及宏观密度测定对合成粉体及块体样品的微结构进行了表征.结果表明:正己烷作为合金化过程控制剂能有效避免粉体板结、团聚及防止合成粉体的氧化;合适的工艺参数(如配球、球料比及球磨转速)可有效促进合金化和降低杂质含量;配镁量对获得纯相Mg2Si块体至关重要;热压压力增大能显著提高Mg2Si块体的致密度;在1.5 GPa压力热压获得了相对密度大于98%、晶粒度为69 nm的纯相纳米晶Mg2Si块体.
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