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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第1期    总第245期    2015年1月

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文章编号:1672-7207(2015)01-0088-06
NiAl-2.5Ta-7.5Cr合金的室温摩擦磨损性能
张孟恩1,王振生1, 2,郭源君1,郭建亭3,周兰章3,杨双双1

(1. 湖南科技大学 机械设备健康维护湖南省重点实验室,湖南 湘潭,411201;
2. 湖南科技大学 高温耐磨材料及制备技术湖南省国防科技重点实验室,湖南 湘潭,411201;
3. 中国科学院金属研究所,辽宁 沈阳,110016
)

摘 要: 采用SEM和XRD分析NiAl-2.5Ta-7.5Cr合金的微观组织,用万能力学试验机测试合金的力学性能,用高速往复摩擦磨损试验机研究合金的室温摩擦磨损特性。研究结果表明:NiAl-2.5Ta-7.5Cr合金由NiAl相、NiAl-Cr共晶和Cr2Ta相组成,其强度和塑性良好。在低P1/2·v (P为载荷,v为速度)下,合金的磨损机制为磨粒磨损,随着P1/2·v的增加,摩擦热效应增强,合金的磨损机制逐渐转变为黏着磨损,摩擦因数和磨损率增加;当P1/2·v>0.54 N1/2·m/s时,摩擦热效应逐渐导致摩擦表面形成了无定形层,无定形层具有自修复特性,部分或全部隔离了摩擦副的直接接触,磨损机制逐渐转变为氧化磨损,磨损率快速降低后保持稳定,摩擦因数逐渐降低;当P1/2·v≥4.02 N1/2·m/s时,合金磨损表面开始出现疲劳磨损特征,表面剥落导致合金的磨损率升高。

 

关键字: NiAl-2.5Ta-7.5Cr合金;摩擦磨损性能;磨损机制;无定形层

Friction and wear behavior of NiAl-2.5Ta-7.5Cr alloy at room temperature
ZHANG Mengen1, WANG Zhensheng1, 2, GUO Yuanjun1, GUO Jianting3, ZHOU Lanzhang3, YANG Shuangshuang1

1. Hunan Provincial Key Laboratory for Health Maintaining of Mechanical Equipment,
Hunan University of Science and Technology, Xiangtan 411201, China;
2. Hunan Provincial Key Defense Laboratory of High Temperature Wear-resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan 411201, China;
3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Abstract:The microstructure and properties of NiAl-2.5Ta-7.5Cr alloy were investigated. The microstructure was analyzed by SEM and XRD, the mechanical properties were conducted by a universal mechanical testing machine, and the friction and wear features at room temperature were studied using a friction and wear tester of high speed reciprocating. The results show that the NiAl-2.5Ta-7.5Cr alloy consists of NiAl, NiAl-Cr eutectic and Cr2Ta, and that makes the alloy have good strength and plasticity. The wear mechanism of alloy is abrasive wear in low P1/2·v. With the increase of P1/2·v, the wear mechanism of NiAl-2.5Ta-7.5Cr alloy gradually transforms itself into the adhesive wear, and at the same time both the wear rate and friction coefficient increase. When P1/2·v is greater than 0.54 N1/2·m/s, the wear mechanism gradually turns into the oxidation wear mechanism. The friction pairs are divided with the amorphous layer formed on the wearing surface. The wear rate keeps stable after decreasing rapidly, and the friction coefficient gradually decreases under the condition. Fatigue wear characteristics appear when P1/2·v is greater than 4.02 N1/2·m/s, and the surface spalling leads to high wear rate.

 

Key words: NiAl-2.5Ta-7.5Cr alloy; friction and wear properties; wear mechanism; amorphous layer

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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