简介：基于成核底层被激活由的假设在冷却下面宪政在起始的团结期间由邻近的谷物生长和溶质分发产生了，为有谷物精炼的铝合金的谷物尺寸的计算的一个模型被开发，在成核被二个参数统治的地方，i.e.growth限制因素Q并且在使参数P.The生长凉下来下面，限制因素Q与起始的率成正比在使开发和罐头凉下来下面宪政与强壮的潜在的成核粒子在合金直接被用作谷物精炼的一个标准。undercoolingparameterP能被认为是最大值在使三角洲T_c.For弱潜在的成核粒子凉下来下面宪政，RGS的使用将是更精确的。纯铝和AISi7合金的谷物精炼的试验性的数据是重合的与模型一起预言了结果。

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简介：Theinfluenceofthegrainboundaryonthefatiguebehaviorwasstuiedbytwothree-point-bending(TPB)specimens.OneTPBspecimenwasnamedBicrystal1,whosepre-crackwasalongthegrainboundaryandtheappliedloadparalleledtopre-crackdirection,whiletheotherTPBspecimenwasnamedBicrystal2,whosethepre-crackwasperpendiculartothegrainboundaryandtheappliedloadparalleledalsotothepre-crack.ItwasfoundthattherateofthefatiguecrackgrowthofBicrystal1wasaboutatenfoldhigherthanthatofBicrystal2.ThefatiguebehaviorofBicrystal2specimenswasdependentonthedistancebetweenthecracktipandgrainboundary.Thecrackgrowthratewashighestwhenthecracktipwasatacriticaldistancetothegrainboundary,whiletheratewasthelowestwhenthecracktipreachedgrainboundary.Afterthecrackwasoverthegrainboundary,thecrackgrowthrateincreased.Thecrystallographicfiniteelementmethodwasappliedtoanalyzethestressandstrainstructureaheadofthecrack,inordertorevealtheabovecharacteristicsofthefatiguebehavior.Itisthegrainboundary-inducedredistributionofstressesnearthecracktipthatinducesthedifferenceoffatiguebehavior.

简介：阶段地水晶(陆军)模型被用来模仿premelting脱臼运动对称当系统温度在时，在紧张行动下面倾斜谷物边界(STGB)远非，到融化的融化的点和结束分别地指。结果证明当premelting温度被接近到，本地premelting发生包围脱臼从在温度下面。STGB的premelting脱臼能在紧张行动下面滑行，并且premelting区域是为脱臼滑行的一个同伴。STGB腐烂的过程以二个高温度条件是很类似的。当premelting介绍，它减少为脱臼的滑行抵抗并且导致脱臼的一个更快的运动，并且也在STGB的腐烂过程期间引起系统的更多的精力减小。尽管有把紧张用于这些，premelting在STGB的整个腐烂过程取样，premelting脱臼区域显然不发展并且延长。这显示外部紧张行动不在高温度支持premelting，并且不能导致更多的premelting脱臼，它能在脱臼展览附近被欠到premelting阶段像液体的性质并且到容易滑行并且放松紧张精力的premelting脱臼；这与实验和分子的动力学的结果一致。

简介：热处理完成，包括答案处理(圣)和老化处理(在)，在优先的奥氏体谷物(PAG)上尺寸，微观结构和变硬的猛冲的机械性质妈发怒不锈钢被调查。结果显示在PAG之间的关系在圣下面并且以条件缩放并且让步力量(sigma_y)服从theHall-Petch关系。而且，在在为1的1050degC的圣以后，h+cryogenic对待(CT)在为在为4h的535degC的8h+AT的-70degC，测试的钢分别地在1900MPa和1750MPa上显示出它的最终的张力的力量(sigma_b)和sigma_y。

简介：商业谷物面向的电的钢被十字做砍滚动(CSR)与选择失配加速比率1.1。0.75公里的原来的表厚，它被常规冷滚动并且中间的退火生产了，从0.35公里被卷到厚度到0.5公里，并且由退火的工业列在后面。变丑质地和磁性被测量。结果显示那：处于CSR的条件，卷的表的变丑质地通常类似于常规卷的表的；为有到0.25公里的从0.35公里的厚度的表，有利变丑质地，主要由左钩住组成111正确钩住(112)，也在表面下的层被发现，它可以帮助生产锋利的高斯质地；并且在期末考试以后退火，表的磁性不比常规卷的表的低。(编辑作者摘要)11个裁判员。

简介：TheprocessofgrainselectioninthespiralselectorwasinvestigatedbybothaProCASTsimulationbasedonacellularautomatonfiniteelement(CAFE)modelandexperimentalconfirmation.Theresultsshowthattheheightofstarterblock,thespiraldiameterandinitialangleplayanimportantroleingrainselection.Thedimensionofselectorshouldbemaintainedinastablerangetooptimizethegrainorientationandselectasinglecrystalefficiently.Aselectorwhichcanefficientlyselectasinglecrystalhadbeensuccessfullydesigned.Grainorientationfluctuationinthespiralpartwasalsostudiedbymeansofthevariationofthermalcondition.

简介：磷的分离和在IN706合金的谷物边界的磷化物的降水上的磷内容和热处理的效果被调查了。磷化物有MNP的stoichiometry(M=Nb，Ti和N=Ni，Fe，Cr)并且斜方晶的水晶结构。在IN706合金的谷物矩阵的磷的溶解度决心在0.008%和0.013%之间。当为打印的3-D的表面修正在980l浸泡了时，植入。在这研究，有毛孔的圆柱的多孔的Ti6Al4V(Ti64)脚手架640缩放吗？？

简介：Byasimplephasefieldmodel,aseriesofnumericalsimulationsofsolidificationmicrostructurewasperformedtoshowarichvarietyofdendriticpatterns.Atthesametime,therelationbetweenthemorphologyofgraingrowthandsomeparametersincludingthestrengthofanisotropy,dimensionlesslatentheatandthesizeofinitialsolidzonewasstudied.Itisforthefirsttimethatpatternsofgraingrowthwereassociatedwiththesizeofinitialsolidzone,whichisaninterestingissue.Thepossiblereasonforthismaybethatvariationinthesizeofinitialsolidzonemaybringaboutfluctuationoftheinterfaceenergy,makingtheinterfaceunstable.

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简介：异步的滚动技术被采用为积累的十通行证感冒滚动，凸缘板钢，并且为焊接H节钢分别地。metallographic微观结构分析，张力的测试和退火的测试为冷卷的片被执行；因此，到谷物，张力的力量，在谷物尺寸之间的关系和在退火以后的异步的滚动过程参数的宽度的长度的比率能被获得。在异步的滚动和卷的片的砍的变丑之间的关系能使异步的滚动可以改进的机制的合理解释成为紧张的试验性的结果表演积累了卷的片的精力和凸缘板钢的力量。这份报纸为在改进凸缘板钢的力量的异步的滚动的申请提供一个理论基础。

简介：掺杂物在在协议的sintering期间定制微观结构起一个关键作用。这些掺杂物可以在体积以内形成稳固的答案，或分离到谷物边界(GB)和稳固蒸汽的接口(免费表面)，引起管理质量的一种不同精力充沛的情形的各个在densification和谷物生长期间搬运。在这个工作，控制掺杂物分发的力量，特别地在表面和GB的并发的分离的可能性，基于分离的各自的热含量被讨论。一个方程基于系统的最小的吉布斯精力被导出从试验性的接口精力数据决定分离的热含量，并且当氧化钇的接口energetics上的掺杂物在它sintering的最后的阶段期间稳定了氧化锆，结果适用描绘La的角色。La实质地减少，这被显示出GB和表面精力(不同地)当sintering进行，动态地在这个阶段影响它的驱动力，和作为结果的谷物生长和densification。

简介：Thestudyofthetriplejunctionsofthegrainboundariesinsomefccsolidsolutions,orderedalloysandintermetallicswithL12hasbeencarriedoutusingtheopticalmetallographyandTEMmethods.Two-typesofthetriplejunctionswerefoundinthealloysinvestigated(1),consistingoftheboundariesoftherandom(RT),and(2),consistingoftheRTboundaryandthespecialboundaries(ST).TherelativevaluesoftheRTandSTboundaryenergyweredeterminedonthebasisofthemeasurementsoftheanglesbetweenthegrainboundaryplanes.IthasbeenshownthattheenergyofSTboundariesincreaseswiththeincreaseofthestackingfault(SF)energy.TheenergyoftheRTboundariesdoesnotdependontheSFenergy.

简介：作为冷滚动并且退火的联合处理的Thermomechanical在奥氏体的不锈钢上被执行301，304并且304L。二冷滚动步直到75%的减小的每一个与在800点的中间的退火被相结合

简介：AdditionofAl-5Ti-1Balloytomoltenaluminumalloyscanrefineα-Algrainseffectivelyandtherebyimprovetheirstrengthandtoughness.TiAl3andTiB2inAl-5Ti-1Balloyarethemainsecondary-phaseparticlesforrefinement,whiletheunderstandingontheeffectoftheirsizesonα-Algrainrefinementcontinuestobefragmented.Therefore,Al-5Ti-1Balloyswithvarioussizesandmorphologiesofthesecondary-phaseparticleswerepreparedbyequalchannelangularpressing(ECAP).Evolutionofthesecondary-phaseparticlesduringECAPprocessandtheirimpactonα-AlgrainrefinementwerestudiedbyX-raydiffractionandscanningelectronmicroscope(SEM).ResultsshowthatduringtheECAPprocess,micro-cracksfirstlyappearedinsideTiAl3particlesandthengraduallyexpanded,whichresultedincontinuousrefinementofTiAl3particles.Inaddition,micro-distributionuniformityofTiB2particleswasimprovedduetotheimpingementofTiAl3particlestoTiB2clustersduringdeformation.ExcessivelylargesizesofTiAl3particleswouldreducethenumberofeffectiveheterogeneousnucleusandthusresultedinpoorgrainrefinementeffectiveness.Moreover,excessivelysmallTiAl3particleswouldreduceinhibitoryfactorsforgraingrowthQandweakengrainrefinementeffectiveness.Therefore,anoptimalsizerangeof18-22μmforTiAl3particleswassuggested.

简介：Thisresearchexplorestheprospectoffabricatingaface-centeredcubic(fee)Ni-basealloycladding(Inconel690)onanfeeFe-basealloy(316Lstainless-steel)havingimprovedmechanicalpropertiesandreducedsensitivitytocorrosionthroughgrainboundaryandmicrostructureengineeringconceptsenabledbyadditivemanufacturing(AM)utilizingelectron-beampowderbedfusion(EPBF).TheuniquesolidificationandassociatedconstitutionalsupercoolingphenomenacharacteristicofEPBFpromotes[100]texturedandextendedcolumnargrainshavinglowerenergygrainboundariesasopposedtorandom,high-anglegrainboundaries,butnocoherent{111}twinboundariescharacteristicofconventionalthermo-mechanicallyprocessedfeemetalsandalloys,includingInconel690and316Lstainless-steel.Inadditionto[100]texturedgrains,columnargrainswereproducedbyEPBFfabricationofInconel690claddingson316Lstainless-steelsubstrates.Also,irregular2-3pimdiameter,lowenergysubgrainswereformedalongwithdislocationdensitiesvaryingfrom10^8to10^9cm^-2,andahomogeneousdistributionofCH3C6precipitates.Precipitateswereformedwithinthegrains(with-3μminterparticlespacing),butnotinthesubgrainorcolumnargrainboundaries.Theseinclusive,hierarchicalmicrostructuresproducedatensileyieldstrengthof0.527GPa,elongationof21%,andVickersmicroindentationhardnessof2.33GPafortheInconel690claddingincontrasttoatensileyieldstrengthof0.327GPa,elongationof53%,andVickersmicroindentationhardnessof1.78GPa,respectivelyforthewrought316Lstainlesssteelsubstrate.AgingofboththeInconel690claddingandthe316Lstainless-steelsubstrateat685℃for50hprecipitated623C6carbidesintheInconel690columnargrainboundaries,butnotinthelow-angle(andlowenergy)subgrainboundaries.Incontrast,Cr23C6carbidesprecipitatedinthe316Lstainless-steelgrainboundaries,butnotinthelowenergycoherent{111}twinboundaries.Consequently,the