【作者】 秦湘阁； 李长瑜； 李清臣；

【Author】 Qin Xiangge,Li Changyu,Li Qingchen School of Materials Science and Engineering,Jiamusi University,154007

【机构】 佳木斯大学材料科学与工程学院；

【摘要】 粉末烧结是纳米材料一种重要的加工工艺,它决定了材料的致密度、显微结构和力学性能和物理性能。计算机模拟对于理解烧结机制和工艺优化具有重要意义。本文用大规模并行分子动力学软件LAMMPS首次进行了铜纳米晶的烧结模拟,建立了纳米颗粒和纳米线的初始结构,研究了纳米尺度的烧结机制和烧结动力学。结果表明,随着纳米晶尺寸减小,其熔点降低,烧结工艺温度也随之降低;在纳米晶烧结过程中,纳米晶之间容易产生无定形结构,加速了孔洞的致密化过程。更多还原

【Abstract】 Powder sintering is an important process for nanomaterials,which significantly affect the material density,microstructure and physical properties.The computer simulation is of great significance for understanding the sintering mechanism and process optimization.In this paper,the large-scale parallel molecular dynamics software,LAMMPS,was used in sintering simulation of copper nanocrystallines with the initial structure of the nanoparticles and nanowires and the nanoscale sintering mechanism and sintering dynamics were also studied.The results show that the smaller size of nanocrystalline,the lower its melting point and the sintering temperature is also reduced.In the sintering process of the nanocrystalline,the region between nanoparticles or nanowires is easy to form an amorphous structure,accelerating the densification process of the pore.更多还原