Microstructure and mechanical properties of in situ NiAl-Mo2C nanocomposites prepared by hot-pressing sintering | |
Department | 固体润滑国家重点实验室 |
Liu EY(刘二勇)1,2; Gao YM(高义民)1; Jia JH(贾均红)2; Bai YP(白亚平)1; Wang WZ(王文珍)2; Gao YM(高义民) | |
2014 | |
Source Publication | Materials Science & Engineering A |
ISSN | 0921-5093 |
Volume | 592Pages:201-206 |
Abstract | NiAl-based nanocomposites reinforced by in situ Mo2C ceramic precipitates were investigated. The results showed that the nanostructured powder particles with the average size below 30 nm were successfully obtained by mechanical alloying. After sintering, the composites were constituted of B2-ordered NiAl and in situ Mo2C ceramic precipitates, and the crystallite size of NiAl phase was below 200 nm and Mo2C ceramic precipitates were evenly dispersed in the NiAl-matrix. Mo2C precipitates were formed by the solid-state reaction of C and metallic Mo element during the hot-pressing sintering process. The relative density, hardness and compressive strength of high-density nanostructured NiAl materials increased with increasing Mo content, which can be attributed to the second phase hardening effect of Mo2C ceramic particulates and fine grain strengthening of nanocrystalline NiAl phase. The wear test results showed that the friction coefficient of NiAl–Mo2C nanocomposites at 700 ℃ (0.35) was significantly lower than that of NiAl alloy (0.48). The improvement of high temperature tribological properties could be attributed to the formation of molybdenum trioxide tribofilm and the second phase hardening effect of Mo2C ceramic particulates. |
Keyword | Nial-based Nanocomposites Mo2c Ceramic Precipitates Microstructure Mechanical Properties Tribofilm |
Subject Area | 材料科学与物理化学 |
DOI | 10.1016/j.msea.2013.06.078 |
Funding Organization | the National Natural Science Foundation of China (Grant nos. 51175490;51101166);the “Hundred Talents Program” of Chinese Academy of Sciences (Grant no. KGCX2-YW-804) |
Indexed By | SCI |
If | 2.567 |
Language | 英语 |
Funding Project | 高温抗磨材料组 |
compositor | 第二作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/5007 |
Collection | 固体润滑国家重点实验室(LSL) |
Corresponding Author | Gao YM(高义民) |
Affiliation | 1.Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China 2.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China |
Recommended Citation GB/T 7714 | Liu EY,Gao YM,Jia JH,et al. Microstructure and mechanical properties of in situ NiAl-Mo2C nanocomposites prepared by hot-pressing sintering[J]. Materials Science & Engineering A,2014,592:201-206. |
APA | Liu EY,Gao YM,Jia JH,Bai YP,Wang WZ,&高义民.(2014).Microstructure and mechanical properties of in situ NiAl-Mo2C nanocomposites prepared by hot-pressing sintering.Materials Science & Engineering A,592,201-206. |
MLA | Liu EY,et al."Microstructure and mechanical properties of in situ NiAl-Mo2C nanocomposites prepared by hot-pressing sintering".Materials Science & Engineering A 592(2014):201-206. |
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