High temperature self-lubricating Ti-Mo-Ag composites with exceptional high mechanical strength and wear resistance
作者机构：Shenyang National Laboratory for Materials ScienceNortheastern UniversityShenyang 110819China School of Mechanical EngineeringNingxia Institute of Science and TechnologyShizuishan 753000China Lingyun Science&Technology Group Co.LtdWuhan 430040China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2024年第180卷第13期
页 面：80-90页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：National Natural Science Foundation of China(No.51871051) Fourth Batch of Ningxia Youth Talents Supporting Program(No.TJGC2019028)
主 题：Titanium High-temperature oxidation Self-lubricating Mechanical properties
摘 要：Titanium alloys are of keen interest as lightweight structural materials for aerospace and automotive ***,a longstanding problem for these materials is their poor tribological ***,we designed and fabricated a multiphase Ti-Mo-Ag composite(TMA)with heterogeneous triple-phase precipitation(TPP)structure by spark plasma sintering.A lamellarα-phase(αL)precipitates from theβ-phase under furnace cooling conditions and maintains a Burgers orientation relationship(BOR)withβ-*** active eutectic transition also occurs in the titanium matrix,resulting in TiAg *** intersecting acicular TiAg and lamellarαL cutβgrains into fine blocks and the primary equiaxedαphase also provides many interfaces withβphase,which together effectively impede dislocation move-ment and increase *** with other titanium composites,TMA with TPP microstructure gets an excellent combination of strength(yield strength 1205 MPa)and toughness(fracture strain 27%).Furthermore,the TPP structure endows TMA with strong cracking resistance,which aids in reducing abra-sive debris at high temperatures during sliding and obtaining a low wear ***,Ag parti-cles distributed at grain boundaries will easily diffuse to the wear surface,in situ forming the necessary lubricating phase Ag_(2)MoO_(4) with Mo-rich matrix debris via *** possesses excellent tribologi-cal properties with especially low wear rate of 8.0 x 10^(-6)mm^(3)N^(-1)m^(-1) and friction coefficient(CoF)of merely 0.20 at 600℃.Unlike other self-lubricating composites with high volume fraction of soft ceramic lubricants,which inevitably sacrifice their mechanical strength and ductility,the composite TMA pos-sesses well-balanced strength,toughness and self-lubricating *** holds important implications to design other metal matrix self-lubricating composites(MMSCs)used for load-bearing moving parts.
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