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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第19卷    第10期    总第127期    2009年10月

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文章编号:1004-0609(2009)10-1815-07
电沉积微纳米镍的组织结构与力学性能
许伟长,戴品强

(福州大学 材料科学与工程学院,福州 350108)

摘 要: 在氨基磺酸镍体系的镀液中通过直流、脉冲电沉积分别制备了不同晶粒尺寸的块体镍。通过室温单向拉伸实验比较了这些镍的力学性能。 结果表明:拓宽电沉积纳米镍的晶粒尺寸分布可显著提高其塑性,同时,保留较高的强度。所制备的具有宽晶粒尺寸分布(5~120 nm)的平均晶粒尺寸为27.2 nm的纳米镍,抗拉强度为1 162~   1 211 MPa,断裂伸长率为10.4%~11.4%。与平均晶粒尺寸为22.4 nm的窄晶粒尺寸分布(5~60 nm)的纳米镍相比,抗拉强度降低约200 MPa,但断裂伸长率提高了3.4%。通过对纳米镍微观组织的TEM观察,揭示了宽晶粒尺寸分布纳米镍中塑性的显著提高源于塑性变形中大晶粒(100 nm以上)内存在类似传统粗晶材料中的晶内位错滑移。
附件:17-p1815-07-17895关键词:纳米镍;力学性能;变形机制;电沉积

 

关键词: 纳米镍;力学性能;变形机制;电沉积

Microstructures and mechanical properties of
electrodeposited microcrystalline and nanocrystalline Ni
XU Wei-chang, DAI Pin-qiang

College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China

Abstract:The bulk Ni with various grain sizes were prepared by direct current or pulse electrodeposition, respectively, in the nickel sulfamate electrolyte. The uniaxial tensile tests were performed at room temperature to compare the mechanical properties among these Ni samples. The results show that the ductility in electrodeposited nanocrystalline (NC) Ni can be significantly enhanced with a higher strength by extending the grain size distribution. The NC Ni samples with a broad grain size distribution (5−120 nm) and an average grain size of 27.2 nm have an ultimate tensile strength (σUTS) of      1 162−1211 MPa and an elongation to failure (δETF) of 10.4%−11.4%. Compared with the NC Ni samples that have a narrow grain size distribution (5−60 nm) and an average grain size of 22.4 nm, the σUTS of NC Ni with a broad grain size distribution decreases by 200 MPa, but the δETF increases by 3.4%. By the TEM observations of the microstructures in NC Ni, it is revealed that the apparent enhancement of ductility in NC Ni with a broad grain size distribution results from the presence of intragranular dislocation sliding in the large grains (above 100 nm) during plastic deformation, similar to that in conventional coarse-grained materials.

 

Key words: nanocrystalline Ni; mechanical property; deformation mechanism; electrodeposition

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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