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挤压比对AA8030铝合金棒材组织及电性能的影响
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-22
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。
挤压比对AA8030铝合金棒材组织及电性能的影响Effect of extrusion ratio on microstructure and electrical
properties of AA8030 aluminum alloy rod
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Al3Fe相形貌的综合影响。
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 Al6Fe phase is
transformed into Al3Fe phase after hot extrusion, Al3Fe
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, when
λ=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 Al3Fe phase.
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