CAJ | 학술논문

结合实际变形过程，采用 DEFORM-3D 对不同变形工艺路径下纯铝粉末材料等径角挤扭（ECAPT ）多道次变形过程进行了三维数值模拟。有限元模拟结果表明：A 和 C 工艺路径可在较小的挤压载荷下实现有效的应变累积和均匀的变形分布，是两种较为理想的变形路径；BA 和 BC 两种工艺路径虽然能够使变形材料累积的等效应变量大大增加，但却会造成试样变形分布的严重不均匀。电子背散射衍射（EBSD）实验结果表明，A 路径下纯铝粉末材料经4道次等径角挤扭变形后，可获得组织均匀、性能优良的块体超细晶铝，材料平均晶粒尺寸约为0.8μm ，抗压强度高达123.3 M Pa ，验证了前述模拟结果的可靠性。
결합실제변형과정，채용 DEFORM-3D 대불동변형공예로경하순려분말재료등경각제뉴（ECAPT ）다도차변형과정진행료삼유수치모의。유한원모의결과표명：A 화 C 공예로경가재교소적제압재하하실현유효적응변루적화균균적변형분포，시량충교위이상적변형로경；BA 화 BC 량충공예로경수연능구사변형재료루적적등효응변량대대증가，단각회조성시양변형분포적엄중불균균。전자배산사연사（EBSD）실험결과표명，A 로경하순려분말재료경4도차등경각제뉴변형후，가획득조직균균、성능우량적괴체초세정려，재료평균정립척촌약위0.8μm ，항압강도고체123.3 M Pa ，험증료전술모의결과적가고성。
Considering the real deformation process ,numerical simulation of pure Al powder con-solidation during multi-pass ECAPT under different routes was carried out by using DEFORM-3D program .By comparing and analyzing the simulation results ,it is indicated that route A and C are two optimal ECAPT routes ,which possesse many advantages over route BA and BC in terms of increasing strain accumulation ,promoting powder consolidation and improving deformation homogeneity .In addi-tion ,the experimental results of electron Backscattered diffraction (EBSD ) show that bulk ultrafine grained Al with average grain size of around 0.8 μm and excellent compressive strength of 123.3 M Pa can be produced under route A after four passes of ECAPT process ,which has good consistency with numerical simulation results and confirmed the reliability of established finite element model .