摘要
采用自悬浮定向流法制备纳米铜粉末,利用不同的工艺参数在真空热压炉中压制成直径一定厚度不同的纳米晶体铜圆柱体。通过XRD、SEM、分析天平、硬度仪等分析测试手段,研究了块体硬度与晶粒大小、密度、晶体结构的关系。结果表明:较薄块体硬度随晶粒长大而降低,两者关系基本符合Hall-Petch经验公式;较厚块体各区域密度差异不明显,受表面缺陷状态及晶粒大小影响,其各处硬度差异较大(1.4～2.2GPa)。
The nanocrystalline copper bulk materials with different thickness were prepared by hot pressing method under different technological parameters and the used Cu nano-powders were obtained by flow-levitation method.The correlations between the grain size,density and structure with rigidity properties of nanocrystalline copper bulk were investigated by using XRD,SEM,balance and sclerometer.The results show that the hardness of thin nanocrystalline copper decreases as its grain size increasing,the relationship of which is accorded with Hall-Petch formula.The hardness value has a large difference at different parts of thick nanocrystalline copper bulk,which is mainly influenced by surface defect and the difference of grain size.The diversity of density is neglectable at the different parts of it.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2010年第8期995-998,共4页
Atomic Energy Science and Technology
基金
国家高技术研究发展计划资助项目(2007AA804415)
国家自然科学基金资助项目(10804101)
作者简介
作者简介：李恺（1977-），男，四川仁寿人，工程师，从事纳米金属固体材料研究
