研究了纳米晶体铜材料的压制工艺条件对其相对密度和显微硬度的影响,并用正电子湮没寿命谱、扫描电镜和热重分析仪对其微观结构进行了表征.结果表明:压制压力越大,保压时间越长,样品的缺陷尺寸及数量减少,相对密度增加,显微硬度显著提高.随着压制压力的增大,缺陷类型的相对含量发生变化.而且纳米铜粉表面吸附的气体是纳米晶体铜样品内部缺陷的一个主要来源.
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