LD锻铝合金过烧组织、性能和疲劳断裂的研究.docx

LD锻铝合金过烧组织、性能和疲劳断裂的研究
LD锻铝合金过烧组织、性能和疲劳断裂的研究
摘要：
随着工业生产的不断发展，越来越多的轻量化和高强度材料被广泛应用于航空、汽车、列车、船舶等领域。LD锻铝合金作为一种重要的轻量化材料，具有优良的力学性能和抗腐蚀性能，受到了广泛关注。然而，LD锻铝合金过烧组织的形成将导致其力学性能下降和疲劳断裂的加剧，因此，研究其过烧组织、性能和疲劳断裂行为对于LD锻铝合金的应用和进一步研究具有重要意义。
本文主要介绍了LD锻铝合金的力学性能、组织和疲劳性能，并从微观和宏观两个层面探讨了其过烧组织对力学性能和疲劳性能的影响。研究结果表明，LD锻铝合金过烧组织的形成将导致其晶界和亚晶界的增多和粗化，进而使合金的力学性能下降。同时，过烧组织还将加剧合金的疲劳断裂倾向，而且随着过烧程度的增加，疲劳寿命将会进一步降低。
综上所述，对LD锻铝合金的过烧组织、性能和疲劳断裂行为进行深入研究，不仅有助于揭示其内部机理，还可以指导制备工艺和材料设计，提高LD锻铝合金的力学性能和疲劳寿命。
关键词：LD锻铝合金；过烧组织；力学性能；疲劳断裂
Abstract:
Withthecontinuousdevelopmentofindustrialproduction,moreandmorelightweightandhigh-strengthmaterialsarewidelyusedinaviation,automobile,train,shipandotherfields.LDforgedaluminumalloy,asanimportantlightweightmaterial,hasexcellentmechanicalpropertiesandcorrosionresistance,whichhasbeenwidelyconcerned.However,theformationofoverburningstructureinLDforgedaluminumalloywillleadtothedeteriorationofitsmechanicalpropertiesandtheaggravationoffatiguefracture.Therefore,itisofgreatsignificancetostudytheoverburningstructure,performanceandfatiguefracturebehaviorofLDforgedaluminumalloyforitsapplicationandfurtherresearch.
Thispapermainlyintroducesthemechanicalproperties,structureandfatiguepropertiesofLDforgedaluminumalloy,andexplorestheinfluenceofoverburningstructureonmechanicalpropertiesandfatiguepropertiesfromtwolevelsofmicroandmacro.TheresearchresultsshowthattheformationofoverburningstructureinLDforgedaluminumalloywillincreasethenumberandcoarseningofgrainboundariesandsub-grainboundaries,whichwillleadtothedecreaseofmechanicalpropertiesofthealloy.Atthesametime,theoverburningstructurewillalsoaggravatethefatiguefracturetendencyofthealloy,andthefatiguelifewillbefurtherreducedwiththeincreaseofoverburningdegree.
Inconclusion,anin-depthstudyoftheoverburningstructure,performanceandfatiguefracturebehaviorofLDforgedaluminumalloycannotonlyrevealitsinternalmechanism,butalsoguidethepreparationprocessandmaterialdesign,andimprovethemechanicalpropertiesandfatiguelifeofLDforgedaluminumalloy.
Keywords:LDforgedaluminumall