Sliding wear induced subsurface microstructural evolution in nanocrystalline Nb-Ag binary alloys and its impact on tribological performance

Chu, Kangjie1; Ren, Fuzeng1; Zhu, Weiwei1; Zhao, Cancan1; Bellon, Pascal2; Averback, Robert S.2

2017-12-15

10.1016/j.wear.2017.09.013

WEAR   影响因子和分区

0043-1648

1873-2577

Powders of Nb and Ag were first subjected to mechanical alloying to force the formation of supersaturated solid solutions and then compacted to near full density using spark plasma sintering. During the sintering process, Ag precipitated out from the Nb matrix along the Nb grain boundaries, with the size of the precipitates depending on the nominal chemical composition. Pin-on-disk wear tests show that the nanostructured Nb-Ag alloys show good wear resistance. A wear factor of 10(-5) mm(3)/(N.m) was observed upon sliding against stainless steel 440C. Ag concentration has a significant effect on the wear rate and wear modes of Nb-Ag alloys. For higher Ag concentration with larger initial Ag precipitate size and lower hardness, severe plastic deformation (SPD) during wear induced the spontaneous formation of alternating Nb and Ag nanolayers. These nanolayered structures remain stable up to the sliding surface, leading to a reduction in the wear rate. In contrast, for lower Ag concentration with smaller Ag precipitate size and higher hardness, SPD can dissolve the Ag precipitates and force the formation of supersaturated solid solutions with equiaxed nanograins below the sliding surface. This results in an increase in the wear rate.

Nb-Ag alloys Nanocrystalline Sliding wear Severe plastic deformation (SPD)

SCI ; EI

英语

第一 ; 通讯

Shenzhen Peacock Plan[KQTD2016053019134356]

Engineering ; Materials Science

Engineering, Mechanical ; Materials Science, Multidisciplinary

WOS:000415885200008

ELSEVIER SCIENCE SA

20174004229915

Binary alloys ; Grain boundaries ; Hardness ; Mechanical alloying ; Nanocrystalline alloys ; Nanocrystals ; Plastic deformation ; Powders ; Precipitates ; Silver alloys ; Solid solutions ; Spark plasma sintering ; Wear of materials ; Wear resistance

Metallurgy and Metallography:531 ; Precious Metals:547.1 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Solid State Physics:933 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
2.Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

Chu, Kangjie,Ren, Fuzeng,Zhu, Weiwei,et al. Sliding wear induced subsurface microstructural evolution in nanocrystalline Nb-Ag binary alloys and its impact on tribological performance[J]. WEAR,2017,392:69-76.

Chu, Kangjie,Ren, Fuzeng,Zhu, Weiwei,Zhao, Cancan,Bellon, Pascal,&Averback, Robert S..(2017).Sliding wear induced subsurface microstructural evolution in nanocrystalline Nb-Ag binary alloys and its impact on tribological performance.WEAR,392,69-76.

Chu, Kangjie,et al."Sliding wear induced subsurface microstructural evolution in nanocrystalline Nb-Ag binary alloys and its impact on tribological performance".WEAR 392(2017):69-76.