简介:Reerystallizafionofcold-roUeddiscontinuousprecipitationmicrostructurewhichhasfinelaminarstructureinanAl-40%7m(atomfraction)binaryalloyisinvestigatedbyopticalmicroscopy,SEMandTEM.Itisfoundthattherearetwokindsofrecrystallizationmechanisms:continuouscoarsening(CC)anddiscontinuouscoarsening(DC).Thelattercanbedividedintocoarseningmainlydrivenbystoreddeformationenergyatcolonyboundariesandslipbandsandtheonemainlydrivenbyboundaryenergyintheareawithlittledeformation.ItisshownthattheadditionofCucanretardthenucleationofcoarseningcellsandtheirgrowth.X-RaydiffractionanalysisindicatedthemetastablephaseCuZn4transformedintoequilibriumphaseAl4Cu3Znduringtheheatingprocess.
简介:ThemicrostructuresandcrystallizationbehaviorofTi–47at%Ni–3at%Feshapememoryalloywireundertheconditionofseverecolddrawingatroomtemperatureanddifferentpost-deformationannealingprocesseswereintensivelyinvestigatedusingtransmissionelectronmicroscope(TEM)anddifferentialscanningcalorimetry(DSC).ItisindicatedthattheamorphousphaseisdominantintheTi50Ni47Fe3wireafterthecolddrawingof78%arealreduction.Thecriticaltemperatureforrecrystalizationisdeterminedatabout300°C.Theaveragegrainsizegrowsfrom7upto125nmwhenannealingtemperaturerisesfrom300to500°C.Post-deformationannealingprocessexertssignificantinfluenceonthecrystallizationtemperaturewhichclimbsupwiththeincreaseofannealingtemperature.
简介:为在水样品的踪迹水银的分析的一个新方法被开发,基于用象由冷蒸汽的稳固的阶段提炼之物和决心的修改dithizone的纳米钛二氧化物(TiO2)的preconcentration/separation的联合原子吸附spectrometry(CVAAS)。Dithizone与酒精被溶解并且在缩放nano的TiO2粉末的表面上装载了由激动人心。修改dithizone的nanoparticles上的Hg2+的静态的吸附行为详细被调查。为Hg2+的优秀吸附比率能与15min,和3.5摩尔的5mL的一摆动时间在78的pH范围被获得,这被发现