以自悬浮定向流技术制备的纳米Al粉末为原料,采用真空热压技术制得了平均晶粒尺寸为90 ～ 123 nm的纳米晶Al块体.通过XRD、SEM和显微硬度测试研究了热压温度和热压压力对纳米晶Al的微观结构和显微硬度的影响.结果表明:各纳米晶Al块体的显微硬度分布在0.8～1.98 GPa范围内.不同的热压温度和热压压力范围内,不同的固结机理主导着纳米晶Al的致密化过程.由于受致密度、晶粒尺寸、微观应变、杂质氧化铝结构等因素的共同影响,纳米晶Al的显微硬度随热压温度的升高先增大后减小,随热压压力的增大表现出先快后慢的增长.低密度块体表现出明显的压痕尺寸效应,而高密度块体并没有表现出这种现象.
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