MICROSTRUCTURE, MECHANICAL, FRICTION AND WEAR PROPERTIES OF NiAl－2.5Ta－7.5Cr－1B ALLOY

WANG Zhensheng; ZHANG Meng'en; YANG Shuangshuang; GUO Jianting; ZHOU Lanzhang; CHEN Zhigang

doi:10.3724/SP.J.1037.2013.00452

Acta Metall Sin >

2013 , Vol. 49 >Issue 11: 1325 - 1332

DOI: https://doi.org/10.3724/SP.J.1037.2013.00452

MICROSTRUCTURE, MECHANICAL, FRICTION AND WEAR PROPERTIES OF NiAl－2.5Ta－7.5Cr－1B ALLOY

WANG Zhensheng ,
ZHANG Meng'en ,
YANG Shuangshuang ,
GUO Jianting ,
ZHOU Lanzhang ,
CHEN Zhigang

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1) Engineering Research Center of Advanced Mining Equipment, Ministry of Education,Hunan University of Science and Technology, Xiangtan 411201
2) High Temperature Wear Resistance Materials and Preparation Technology of Hunan Province,the National Defense Science and Technology Key Laboratory, Hunan University of Science and Technology, Xiangtan 411201
3) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Received date: 2013-07-27

Revised date: 2013-08-28

Online published: 2013-11-11

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Abstract

The microstructure and properties of NiAl－2.5Ta－7.5Cr－1B alloy are investigated in this work. The microstructure is analyzed by SEM and XRD, the mechanical properties are conducted by a universal mechanical testing machine and the friction and wear features from room temperature to 600℃ are mainly studied using an elevated temperature friction and wear machine. The experimental results show that the NiAl－2.5Ta－7.5Cr－1B alloy consists of NiAl, eutectic (NiAl－Cr), Cr₂Ta, (Ta, Cr)₃B₂ and TaB. The addition of B into the NiAl－2.5Ta－7.5Cr alloy improves the plasticity by 50%. The NiAl－2.5Ta－7.5Cr－1B alloy exhibits excellent self－lubricating and wear－resistant properties from room temperature to 600℃ which could be mainly attributed to the co－existence of B₂O₃ liquid phase and Al₄B₂O₉ solid particles on the worn surface. The B₂O₃ liquid phase makes the friction and wear process conform to the mechanism of hydrodynamic lubrication and the Al₄B₂O₉ solid particles have a load－bearing function.

Key words： NiAl－2.5Ta－7.5Cr－1B alloy; microstructure; mechanical property; friction and wear property

Cite this article

WANG Zhensheng , ZHANG Meng'en , YANG Shuangshuang , GUO Jianting , ZHOU Lanzhang , CHEN Zhigang . MICROSTRUCTURE, MECHANICAL, FRICTION AND WEAR PROPERTIES OF NiAl－2.5Ta－7.5Cr－1B ALLOY[J]. Acta Metall Sin, 2013 , 49(11) : 1325 -1332 . DOI: 10.3724/SP.J.1037.2013.00452

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