南京理工大学学报（自然科学版）2012，Vol.36Issue(1)：152-157,6.
热压烧结块体纳米晶镍的微观组织及力学性能
Microstructures and Mechanical Properties of Hot-press Sintered Bulk Nanocrystalline Nickel
摘要
Abstract
In order to explore the practical preparation method of bulk nanocrystalline nickels, direct current arc plasma evaporation method and hot-press sintering are used to prepare the bulk nanocrystalline nickels under lower temperatures. The crystal structures, surface micrographs and porosities of nickels are studied by employing the X-ray diffraction (XRD) , transmission electron microscope (TEM), scanning electron microscope (SEM) and Archimedes method. The compressive properties of the specimens at ambient temperature are also investigated by using the digital image correlation method (DIC). The results show that the bulk nanocrystalline nickel with an average grain size of 62.1 nm can be prepared by sintering under 2.5 Gpa and 500 X.. This sample has a relative density of 95. 8% ,an ultimate tensile strength of 905 Mpa,an elongation to failure of 11.5% and no obvious yield. However, its plasticity decreases due to narrow grain size distribution and the holes in the bulk nanocrystalline nickels.关键词
块体纳米晶镍/热压烧结/微观组织/力学性能Key words
bulk nanocrystalline nickels/ hot-press sintering/ microstructures/ mechanical property分类
矿业与冶金引用本文复制引用
巴志新,张振忠,戴玉明,周剑秋,张少明..热压烧结块体纳米晶镍的微观组织及力学性能[J].南京理工大学学报（自然科学版）,2012,36(1):152-157,6.基金项目
国家自然科学基金(10502025,10872087) （10502025,10872087）
南京工程学院青年基金(QKJA2009003) （QKJA2009003）
