PREDICTION OF MECHANICAL PROPERTY OF WHISKER REINFORCED METAL MATRIX COMPOSITE: PART-Ⅰ. MODEL AND FORMULATION

Based on study of strain distribution in whisker reinforced metal matrix composites, an explicit precise stiffness tensor is derived. In the present theory, the effect of whisker orientation on the macro property of composites is considered, but the effect of random whisker position and the complicated strain field at whisker ends are averaged. The derived formula is able to predict the stiffness modulus of composites with arbitrary whisker orientation under any loading condition. Compared with the models of micro-mechanics, the present theory is competent for modulus prediction of actual engineering composites. The verification and application of the present theory are given in a subsequent paper published in the same issue.     

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF PARTICULATE REINFORCED MATRIX COMPOSITE

Sprayatomizationandco-depositiontechnique,bywhichreinforcementparticulatesandmetalmatrixaremixedtopreparecomposite,belongstothecategoryofrapidsolidification[lj.Comparedwithsqueezecasting,stringcasting,powdermetallurgyandin-situmethod,sprayatomizationandco-depositiontechniquehasitsparticularadvantages["'J:Thestrengtheningfunctionofthereinforcementfineparticulateismadefulluseof;volumefractionofreinforce-mentparticulatecouldbeadjustedwithinacertainrange,andtheinterfacecohesionisgreatiyimprovedlha…     

PULSED Nd-YAG LASER WELDING OF AN AI-SiC_p METAL MATRIX COMPOSITE

SupportedbytheNationalNaturalScienceFoundationofChinaThefewweldingtechniques,includinggastungstenarcwelding,gasmetalarcweldingandelectronbeamwelding,whichhavebeenexploredforjoiningofMMCs,werefoundtobeunsatisfactorymainlyduetotheformationofexcessivebrittleAl-carbidephase["2'J.Never-theless,limitedsuccesshasbeenachievedinusingCO,laserstoweldcertaintypesofAl-Si/SiCMMCs[s'J.Themeritsoflaserweldingareapparent:theintrinsicfocusingabilityandtheca-pabilityofhavingprecisecontroloverthelaserpro…