Fabrication of bulk nanocrystalline Ni by spark plasma sintering

被引：0

作者：

Yu Z. ^{[1
,2
]}

Luo J. ^{[1
]}

Lei H. ^{[1
]}

Liu Y. ^{[2
]}

Han S. ^{[1
]}

Wu W. ^{[1
]}

Tang Y. ^{[1
]}

机构：

[1] Research Center of Laser Fusion, CAEP, Mianyang 621900

[2] College of Material Science and Engineering, Sichuan University

来源：

Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | 2010年 / 22卷 / 12期

关键词：

Bulk nanocrystalline Ni; Fractography; Microhardness; Spark plasma sintering;

D O I：

10.3788/HPLPB20102212.2989

中图分类号：

学科分类号：

摘要：

Ni nano-particles were prepared by flow-levitation method. And then, bulk nanocrystalline Ni samples, 10 mm in diameter and 2 mm in height with a relative density of 96.8 % and a microhardness of 4.17 GPa, were fabricated by spark plasma sintering using the nano-particles. The phase composition, grain size, microstructure and microhardness of the bulk samples were characterized by X-ray diffractometer, scanning electron microscope, and Vickers microhardness tester, respectively. The results indicate that the relative density and grain size increase with increasing sintering temperature. The optimal relative density has been obtained at the sintering temperature of 650°C, at which the average grain size is 44.8 nm. The microhardness first increases and then decreases with increasing sintering temperature. Its optimal value is 4.33 GPa obtained at the sintering temperature of 550°C. When the sintering temperature is high, the appearance of nano-dimples in fractography reveals the existence of ductile fracture morphology.

引用

页码：2989 / 2992

页数：3

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