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简介:ThemechanismoftheinterfacialreactionofAl2O3/mediumMnsteelcontainingNbwasstudiedbymeansoftheobservationontheinterfacialreactionphenomenonofAl2O3/mediumMnsteel,andtheanalysesontheinterracialphases.TheresultsshowthatwhenT≥1550℃,theinterfacialreac-tionofAl2O3/mediumMnsteelcontainingNbhappened.InthemediumMnsteelmatrix,NbexistsintheformofNbC.NbCarethenucleatingbaseofCOgasbubbles.
简介:Thedeformationmechanismsandprocessingmapsoftheas-castAl-Zn-Mg-Cu(7075)aluminum(Al)alloywerestudiedandcomparedwiththoseofthehomogenized7075Alalloyinthetemperaturerangeof573–723Kandinthestrainraterangeof10~(-3)–10s~(-1)toexploreapossibilityfordirectlyusingtheascast7075Alalloyasabilletforhotworking.Theas-castandhomogenized7075Alalloyshadsimilargrainsizesandshowedsimilarhigh-temperaturedeformationbehaviors.Theas-cast7075Alalloy,however,exhibitedhigherpowerefficienciesandsmallerunstable?owregionscomparedtothehomogenized7075Alalloybecauseofthepresenceofsecondaryphases(MgZn_2)segregatedatthedendriticinterfacesintheas-castmicrostructure,whichwereformedduringnon-equilibriumsolidi?cation.Thesesegregatedphasesprovidednucleationsitesfordynamicrecoveryorcontinuousdynamicrecrystallization,andasaresulta?neandmorehomogeneous(sub)grainstructurecouldbeobtainedfromtheas-castmicrostructurecomparedtothehomogenizedmicrostructure.Thecurrentworksuggestedthepossibilityandadvantageofusingas-castmicrostructuresforhotworkingofaluminumalloyswithhighcontentofsolutes.
简介:在“设计”回到问题发现与解决的原点时,能够综合、整体的解决问题的设计团队构成及其工作的方式成为关注的焦点和学习的中心。在全球性跨学科交叉设计教育的背景下,我们也在为此做出尝试。通过课程关注具有社会责任感的设计命题、运用用户研究/交互设计方法、团队协作工作技巧挖掘问题,横跨艺术设计五大专业方向的设计团队成员各自发挥专业技能,共同解决设计命题。
简介:文章首先分析了中职学校开设Fedora课程的必要性与可行性,然后从中职网络技术专业学生就业岗位职业能力入手制定教学内容,最后重点探讨了Fedora课程的教学方法与手段。