Grain growth and thermal stability of nanocrystalline Ni-TiO2 composites

被引：12
|
作者：
Niu, Te [1 ]
Chen, Wei-wei [1 ]
Cheng, Huan-wu [1 ]
Wang, Lu [1 ]
机构：
[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2017年 / 27卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Ni; TiO2; nanocrystalline; grain growth; thermal stability; diffusion mechanism; activation energy; BEHAVIOR; NICKEL; MICROSTRUCTURE; ALLOYS;
D O I：
10.1016/S1003-6326(17)60256-5
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The grain growth and thermal stability of nanocrystalline Ni-TiO2 composites were systematically investigated. The nanocrystalline Ni-TiO2 composites with different contents of TiO2 were prepared via electroplating method with the variation of TiO2 nano-particles concentration. The effect of TiO2 content on the grain size, phase structure and microhardness was investigated in detail. The corresponding grain growth and diffusion mechanisms during the heating process were also discussed. The optimal microhardness of HV50 270 was achieved for the composite with addition of 20 g/L TiO2 nano-particles after annealing at 400 degrees C for 90 min. The calculation of the activation energy indicated that lattice diffusion dominated at high temperatures for the nanocrystalline Ni-TiO2 composites. It was indicated that the increase of TiO2 nano-particles content took effect on restricting the grain growth at high temperatures by increasing the grain growth activation energy.
引用
收藏
页码：2300 / 2309
页数：10
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