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The Preparation And Friction Wear Behaviors Of Fe3Al-ZA27Composites

Posted on:2013-10-31Degree:MasterType:Thesis
Country:ChinaCandidate:F XuFull Text:PDF
GTID:2231330374987234Subject:Materials science
Abstract/Summary:PDF Full Text Request
The zincaluminium alloy has become a kind of very good wear-resisting material owing to its soft foundation and hard phase structure,but the high temperature strength is poor. Fe3Al intermetallic has a superlattice crystal structure, the strength is increasing with the rise of temperature under600℃.The environmental plasticity is poor, but in the friction and wear applications, because material force is more for pressure, so its plasticity requirements are not very demanding, so making it as matrix component of the friction materials, joining up the zincaluminium alloy as the function of wear-resisting, we can get a new kind of composite friction material with optimal general properties.In this study, the zincaluminium alloy was prepared by means of melting and casting process. The mechanical properties and friction wear properties of caststate ZA27alloy with different Fe content were investigated by scanning electron microscopy(SEM), X-ray diffractometry(XRD), UMT-3friction testing machine and tensile tests. According to the comprehensive performances, the appropriate iron addition amount was selected. The selected ZA27-x alloy was made into powders by gas atomization process. Fe3Al powder was prepared by mechanical alloying. The mechanical properties and friction wear properties of the Fe3Al-ZA27composite materials with different ZA27-x alloy powder content were investigated,the conclusions were as following:1)With the increase of the content of Fe, the tensile strength of the Zn aluminum alloy decreased; hardness improved; the coefficient of thermal conductivity presented a descending trend. At150℃,the strength was obviously improved when Fe content was1.5%.2)The wear mechanism of the zinc aluminum alloy were particle attrition and oxidative wear, and accompanied by adhesion wear. With the increase of the content of iron, volume wear was decreased. When iron content was1.5%, a smooth enamel layer was formed on the friction surface, help to reduce wear.3)The hardness and strength, and the coefficient of thermal conductivity of the Fe3A1-ZA27composite materials firstly increased and then decreased along with the increase of the content of ZA27-3. When the content of ZA27-3was50%, the hardness and coefficient of thermal conductivity achieved maximum.4)The wear mechanism of Fe3Al-ZA27composite materials were abrasive wear, oxidative wear and adhesion wear. With the increase of the content of ZA27-3, volume wear reduced, when the content of ZA27-3was50%, a smooth oxidation film formed on the friction surface, help to reduce wear.
Keywords/Search Tags:Zincaluminium alloy, Fe3Al intermetallic, mechanicalproperty, friction wear property
PDF Full Text Request
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