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1、?46?8?Vol.46No.82010?8?979983?ACTA METALLURGICA SINICAAug.2010 pp.979983Bi2O3?Al18B4O33?1)?2)?1)?1)1)?,?1500012)?,?264006?Bi2O3?Al18B4O33?.?Bi2O3?.?.?,?80?285?2?.?,?.?P2?.?P1?Bi?.?P2?Al?.?,Al18B4O33?,Bi2O3?,?,?TG142.7?A?04121961(2010)08097905DAMPING CAPACITY OF Bi2O3COATED Al18B4O33WHISKER REINFORCE
2、D Al MATRIX COMPOSITESLIU Gang1),SUN Yali2),HU Jin1),ZHOU Ke1)1)School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 1500012)Department of Mechanical Technology,Yantai Engineering&Technology College,Yantai 264006Correspondent:HU Jin,professor,Tel:(0451)86415894,E-mail:Ma
3、nuscript received 20100202,in revised form 20100409ABSTRACTIn metal matrix composites(MMCs),the reinforcement/matrix interface has a pro-found effect on its overall properties.The proper selection or design of the interfacial phase plays avital role in optimizing the final properties of MMCs,in whic
4、h high damping capacity is one of the mostimportant properties of materials used in engineering structure.Although the damping mechanism ofdiscontinuously reinforced aluminum composites has been extensively studied,only a few of researcheshave been reported on the effect of whisker coatings on the d
5、amping capacity of MMCs.In this paper,the pure aluminum matrix composites reinforced by alumina borate(Al18B4O33)whisker with andwithout Bi2O3coatings were separately fabricated by squeeze and the volume fraction of Al18B4O33whisker in these composites is about 20%.The mass ratios between Al18B4O33w
6、hisker and Bi2O3were set as 6?1,10?1 and 20?1,respectively.The effects of coating contents and strain amplitudeson the damping properties of the coated composites at various temperatures and frequencies were ex-amined.Two damping peaks(P1 and P2)in the coated composites at around 80 and 285?wereobse
7、rved.The results of damping characterization indicate that the damping capacity of the coatedcomposites strongly depends on the content of coatings and strain amplitudes.Moreover,P2 increasesmore rapidly with increasing the coating content and strain amplitude.P1 is related to dislocationmotion and
8、interfacial slip between the whisker and Bi phase.The damping mechanism of P2 changeswith the increase of stain amplitude.KEY WORDS Al matrix composite material,Al18B4O33whisker,Bi2O3coating,interface,damping capacity?13,?.*?:20100202,?:20100409?:?,?,1980?,?DOI:10.3724/SP.J.1037.2010.00067?,?,?.?,?/
9、?,?.?980?46?,?,?49.?10?(CVD)?,?.Gu?9,11?Cu?,?.?12?,SnO2?Al18B4O33?Al?.?,?,?.?Al18B4O33?Bi2O3,?Bi2O3?Al?Bi?,?,?.1?0.51.5 m,?1030 mAl18B4O33?,?Al.?Al18B4O33?Bi2O3.?,?30 min?,?,Bi(OH)3?.?830?Bi(OH)3?,?Bi2O3?.?20%?,?Bi2O3?Al18B4O33?0,1?20,1?10?1?6.?ABOw/Al,20ABOw/BiO/Al,10ABOw/BiO/Al,6ABOw/BiO/Al.?Phili
10、ps?XPert?(XRD)?,?Cu?,?40 kV,?35 mA.?S4700?(SEM)?.?FEI?TECNAI G2?(TEM)?,?300 kV.?TAQ800?,?.?36 mm6 mm1 mm.?20400?,?5?/min.?0.520 Hz,?4105,4104?8104.2?1?SEM?.?1a?,?.?1b1d?1?Bi2O3?Al18B4O33?Fig.1SEM morphologies of Al18B4O33whiskers before(a)and after chemically depositing Bi2O3withBi2O3/ABOw mass rati
11、os of 1?20(b),1?10(c)and 1?6(d)?8?:Bi2O3?Al18B4O33?981?SEM?(?1?20,1?10?1?6),?,?.XRD?Bi2O3,?Bi2O3?.?2?10ABOw/BiO/Al?SEM?.?,?Al18B4O33?Al?.?.?3?XRD?.?,?Al?Al18B4O33?,?Al?Al18B4O33?,?Bi?.?,Bi2O3?Al?,?Bi?Al2O3(?)13.?4?TEM?.?4a?,ABOw/Al?,?210ABOw/BiO/Al?Fig.2Morphologyof10ABOw/BiO/Al(Bi2O3/ABOwmass ratio
12、s 1?10)composite prepared by squeezingmethod?3ABOw/Al?10ABOw/BiO/Al?XRD?Fig.3XRD patterns of ABOw/Al and 10ABOw/BiO/Alcomposites?,?.?10ABOw/BiO/Al?,?,?,?(?4b).?5?10ABOw/BiO/Al?(4105)?.?,?,?,?5 Hz?,?,?(Q1)?;?,?,?,?80?285?2?(P1?P2),?2?.?6?10ABOw/BiO/Al?,?,?.?200?,?.?200?,?.?,?P2?,?,?4 ABOw/Al?10ABOw/B
13、iO/Al?Fig.4Morphologies of interfaces in ABOw/Al composite(a)and 10ABOw/BiO/Al composite(b)?982?46?510ABOw/BiO/Al?Fig.5Dampingtemperature curves of 10ABOw/BiO/Alcomposite at various frequencies?610ABOw/BiO/Al?Fig.6Dampingtemperature curves of 10ABOw/BiO/Alcomposite at different strains?7 ABOw/Al?ABO
14、w/BiO/Al?Fig.7Damping capacities of ABOw/Al composite andABOw/BiO/Al composites with different Bi2O3con-tents?,?.?7?.?,?.?,?.?,?P1?.?.3?10,14?,?,?/?.?ABOw/Al?,?,?.?P1?ABOw/BiO/Al?,?ABOw/Al?15,?P1?ABOw/Al?.?,?,?ABOw/Al?P1?15.?/?.?ABOw/BiO/Al?,ABOw/BiO/Al?.?2?.?,?Bi?Al?,?.?.?ABOw/Al?,?,?,?,?P1?ABOw/Al
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