Dense nanostructured nickel produced by SPS from mechanically activated powders: enhancement of mechanical properties
Dense nanostructured nickel produced by SPS from mechanically activated powders: enhancement of mechanical properties
复制标题
利用机械活化粉末通过 SPS 生产致密纳米结构镍：增强机械性能
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
F. Bernard
中科院分区：
文献类型：
--
作者：
F. Naimi;L. Minier;S. L. Gallet;H. Couque;F. Bernard
进行了一项调查，以评估放电等离子烧结工艺在生产致密的纳米结构材料的潜力。采用高能球磨机械活化后，以镍粉（APS 3-7 μm）为原料，通过SPS烧结制备了微结构和纳米结构镍。首先，进行烧结研究，以确定SPS处理条件，以达到完全致密化的试样直径为50毫米，高度为10毫米。在第二步中，用致密镍盘进行实验研究以产生拉伸性能。拉伸试验在应变速率为10-3 s-1下进行，试样标距长度为16 mm，标距直径为4 mm。用微结构化镍达到超过40%的拉伸延展性。对于纳米结构的镍，超过600 MPa的高屈服应力被测量为具有30%的拉伸延展性。这些结果进行了分析，通过致密化和微观结构的测量。
An investigation was performed to evaluate the potential of the spark plasma sintering process in producing dense nanostructured materials. Microstructured and nanostructured nickel was sintered by SPS starting from nickel powder (APS 3-7 µm) in the asreceived state and after a mechanical activation using a high-energy ball mill. First, a sintering study to determine SPS processing conditions to reach full densification was carried out with specimens 50mm in diameter and 10mm in height. In a second step, an experimental investigation was undertaken with dense nickel disks to generate tensile properties. The tensile tests were performed at a strain rate of 10-3 s-1 with specimens 16mm in gage length and 4mm in gage diameter. Tensile ductility in excess of 40% was reached with the microstructured nickel. For the nanostructured nickel, high yield stresses in excess of 600 MPa were measured with a tensile ductility of 30%. These results were analyzed through densification and microstructure measurements.