會(huì)計(jì)學(xué)1DSC在新材料研究中磁性合金TheFe–Si–B–Cu–Nbamorphousalloywiththecompositions:Fe73.5Si13.5B9Nb3Cu1afterappropriateannealingexhibitsexcellentmagneticproperties,thesesuperiorpropertiesresultfromcrystallizationofaninitiallyamorphousmaterial,leadingtotheformationofnanocrystals(about10nminsize)oftheFe3Siphaseintheremainingamorphousmatrix第1頁/共23頁ThisalloyisnowavailablecommerciallyasFinemet.一個(gè)非常了不起的發(fā)明。YoshizawaY,OgumaS,YamauchiK(1988)第2頁/共23頁TheeffectofCopperalloyingadditionsonthecrystallizationofanamorphousFe–Si–BalloyY.R.Zhang，R.V.Ramanujan第3頁/共23頁第4頁/共23頁第5頁/共23頁ThefirstpeakcorrespondstotheformationoftheFe3SiphaseandthesecondpeakindicatestheappearanceoftheFe3Bcompound.第6頁/共23頁ItshowedthatCualloyingadditionmadeprimarycrystallizationeasiersuggestingthatitenhancesthekineticsofcrystallization.FortheFe–Si–B–CualloythemicrostructuralMicrostructuralevolutionwassignificantlydifferent:foraheattreatmenttemperatureof420C,insteadofadendriticmorphology,spheroidalcrystalslessthan100nminsizewereobservedasthefirstcrystallizationproducts第7頁/共23頁IntheFe–Si–Balloysystems,adendriticmorphologyiscommonlyobservedduetosoluterejectionduringcrystallizationresultinginconstitutionalsupercooling.反差多么強(qiáng)烈！第8頁/共23頁更復(fù)雜的合金第9頁/共23頁納米Al合金第10頁/共23頁第11頁/共23頁第12頁/共23頁第13頁/共23頁第14頁/共23頁第15頁/共23頁焊接釬料第16頁/共23頁第17頁/共23頁你選擇什么工藝制造釬料？第18頁/共23頁第19頁/共23頁第20頁/共23