Effect of nano Al2O3 addition on mechanical properties and wear behavior of NiTi intermetallic

被引:36
作者
Farvizi, M. [1 ]
Ebadzadeh, T. [2 ]
Vaezi, M. R. [1 ]
Kim, H. S. [3 ]
Simchi, A. [4 ,5 ]
机构
[1] Mat & Energy Res Ctr, Nanotechnol & Adv Mat Div, Tehran, Iran
[2] Mat & Energy Res Ctr, Div Ceram, Tehran, Iran
[3] Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Pohang 790784, South Korea
[4] Sharif Univ Technol, Dept Mat Sci & Engn, Tehran, Iran
[5] Sharif Univ Technol, Inst Nanosci & Nanotechnol, Tehran, Iran
来源
MATERIALS & DESIGN | 2013年 / 51卷
关键词
NiTi; Nano Al2O3; Phase stability; Nanoindentation; Wear; PSEUDOELASTIC TINI ALLOY; RESISTANT MATERIAL; COMPOSITES; TRANSFORMATION;
D O I
10.1016/j.matdes.2013.03.099
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
It has been found that the high wear resistance of NiTi alloy is mainly attributed to its pseudoelasticity which is only effective within a small temperature range. It is believed that pseudoelasticity becomes ineffective by applying high-load wear condition which yields plastic deformation and temperature increment during wear test. Therefore, the enhanced wear resistance can be obtained from the improvement of mechanical property of the alloy without much reduction of pseudoelasticity. In this study, a low weight percentage of hard Al2O3 nanoparticles were added to NiTi atomized powders. The resultant powder mixture was homogenized by ball milling and sintered in a vacuum furnace in order to improve the wear property of the composite in comparison with the NiTi alloy. The results demonstrated that the addition of nanoparticles increased the stability of martensite phase. Nanoindentation test results showed that both hardness and elastic modulus were considerably increased in the composite samples in comparison with pure NiTi, while the pseudoelasticity was not significantly reduced. The worn surfaces were investigated using a scanning electron microscope equipped with energy dispersive X-ray. The wear test results confirmed the improved wear performance of NiTi matrix after the addition of nanoparticles under both low and high loads can be mainly attributed to superior mechanical properties combined with pseudoelasticity effect of the composite samples. (c) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:375 / 382
页数:8
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