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擠壓比對AA8030鋁合金棒材組織及電性能的影響
發(fā)布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-08-22
采用熱擠壓成型工藝制備AA8030(Al-0.7Fe-0.2Cu)鋁合金棒材，通過金相(OM)、掃描電鏡(SEM)、透射電鏡(TEM)及電導(dǎo)率測量等研究擠壓比對合金微觀組織及電性能的影響。
擠壓比對AA8030鋁合金棒材組織及電性能的影響Effect of extrusion ratio on microstructure and electrical
properties of AA8030 aluminum alloy rod
采用熱擠壓成型工藝制備AA8030(Al-0.7Fe-0.2Cu)鋁合金棒材，通過金相(OM)、掃描電鏡(SEM)、透射電鏡(TEM)及電導(dǎo)率測量等研究擠壓比對合金微觀組織及電性能的影響。結(jié)果表明：合金在擠壓變形過程中發(fā)生動態(tài)再結(jié)晶，且分布于鑄態(tài)合金中的網(wǎng)狀A(yù)l6Fe相在擠壓過程中轉(zhuǎn)變?yōu)锳l3Fe相，Al3Fe相能夠促進(jìn)再結(jié)晶形核、釘扎晶界、細(xì)化合金晶粒。在擠壓變形過程中，隨著擠壓比(λ=6~28)的增大，合金電導(dǎo)率先上升再下降；當(dāng)λ=13時，合金電導(dǎo)率達(dá)到最大值60.8%(IACS)。運(yùn)用Matthiessen公式計(jì)算不同固溶原子含量時合金的電導(dǎo)率，模型預(yù)測結(jié)果與實(shí)驗(yàn)結(jié)果吻合良好。計(jì)算及實(shí)驗(yàn)結(jié)果表明：在較低的擠壓比(λ=6~17)下，AA8030合金的電性能主要依賴于固溶原子含量的變化；而在較高的擠壓比(λ=17~28)下，合金的電性能將受到固溶原子、位錯密度及Al3Fe相形貌的綜合影響。
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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