CAJ | 학술논문

采用热挤压成型工艺制备AA8030(Al-0.7Fe-0.2Cu)铝合金棒材，通过金相(OM)、扫描电镜(SEM)、透射电镜(TEM)及电导率测量等研究挤压比对合金微观组织及电性能的影响。结果表明：合金在挤压变形过程中发生动态再结晶，且分布于铸态合金中的网状Al6Fe相在挤压过程中转变为Al3Fe相，Al3Fe相能够促进再结晶形核、钉扎晶界、细化合金晶粒。在挤压变形过程中，随着挤压比(λ=6~28)的增大，合金电导率先上升再下降；当λ=13时，合金电导率达到最大值60.8%(IACS)。运用Matthiessen公式计算不同固溶原子含量时合金的电导率，模型预测结果与实验结果吻合良好。计算及实验结果表明：在较低的挤压比(λ=6~17)下，AA8030合金的电性能主要依赖于固溶原子含量的变化；而在较高的挤压比(λ=17~28)下，合金的电性能将受到固溶原子、位错密度及Al 3 Fe相形貌的综合影响。
채용열제압성형공예제비AA8030(Al-0.7Fe-0.2Cu)려합금봉재，통과금상(OM)、소묘전경(SEM)、투사전경(TEM)급전도솔측량등연구제압비대합금미관조직급전성능적영향。결과표명：합금재제압변형과정중발생동태재결정，차분포우주태합금중적망상Al6Fe상재제압과정중전변위Al3Fe상，Al3Fe상능구촉진재결정형핵、정찰정계、세화합금정립。재제압변형과정중，수착제압비(λ=6~28)적증대，합금전도솔선상승재하강；당λ=13시，합금전도솔체도최대치60.8%(IACS)。운용Matthiessen공식계산불동고용원자함량시합금적전도솔，모형예측결과여실험결과문합량호。계산급실험결과표명：재교저적제압비(λ=6~17)하，AA8030합금적전성능주요의뢰우고용원자함량적변화；이재교고적제압비(λ=17~28)하，합금적전성능장수도고용원자、위착밀도급Al 3 Fe상형모적종합영향。
AA8030 aluminum alloy (Al-0.7Fe-0.2Cu) rod was prepared by hot extrusion, and the influences of extrusion ratio on microstructure and electrical properties of alloy were investigated by OM, SEM, TEM and conductivity determination. The results show that the dynamic recrystallization occurs during hot extrusion, moreover, the meshy Al 6 Fe phase is transformed into Al 3 Fe phase after hot extrusion, Al 3 Fe phase promotes recrystallization nucleation, pins grain boundary and refines alloy grain. During hot extrusion, as the extrusion ratio (λ=6?28) increases, the electrical conductivity of alloy increases at first, then decreases, whenλ=13, the electrical conductivity of alloy reaches a maximum value of 60.8%(IACS). Matthiessen equation was used to calculate the effect of solution atom on the electrical performance of alloy, the model predictions are in good agreement with experimental results. The results indicate that when the extrusion ratio is low (λ=6?17), the electrical performance of alloy depends on the content of solution atom, at a higher extrusion ratio (λ=17?28), the electrical performance will be affected by solution atom, dislocation density and morphology of Al 3 Fe phase.