連續(xù)冷卻對7020合金組織與性能的影響

連續(xù)冷卻對7020合金組織與性能的影響Effect of continuous cooling on microstructures and properties of 7020 alloy

采用掃描電鏡和透射電鏡觀察、電阻率和硬度測試等手段，研究連續(xù)冷卻條件對7020合金時效組織性能的影響，并繪制實驗合金的CCT圖。結(jié)果表明：實驗合金的連續(xù)冷卻脫溶產(chǎn)物主要包括GP區(qū)、η′相和η相，高溫階段主要對應(yīng)η相在彌散粒子、晶界等異質(zhì)形核質(zhì)點上的優(yōu)先析出，中溫階段主要對應(yīng)η相在基體內(nèi)均勻析出，低溫階段則主要對應(yīng)GP區(qū)、η′相的析出，實驗合金的臨界冷卻速率達(dá)到700 ℃/min以上。不同冷卻條件引起析出相組態(tài)的變化，導(dǎo)致合金的硬度和電阻率隨冷卻速率降低而發(fā)生相應(yīng)的變化。較慢冷卻速度下的脫溶會消耗溶質(zhì)原子，從而導(dǎo)致時效驅(qū)動力下降，而合適的冷卻速率下形成的亞穩(wěn)相則可作為時效強化相的前驅(qū)體，能夠加速時效強化相析出，導(dǎo)致合金的時效硬化曲線峰值時間提前。

The effect of continuous cooling process on aging microstructure and properties was investigated by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), electrical resistivity and hardness test. The results show that the continuous cooling precipitations for 7020 alloy are GP zones, η and η′ phases. The high temperature transformation corresponds to the heterogeneous precipitation of η phase. The medium temperature zone corresponds to the homogeneous precipitation of η phase. While, GP zones and η′ phases are precipitated in the low temperature zones. The critical cooling rate for 7020 alloy inhibiting any cooling precipitates is more than 700 ℃/min. The hardness and electrical resistivity change with the extending of cooling ending time with the extending of cooling ending time, since the different microstructures induce by different cooling processes. The precipitation of metastable phases during the cooling process leaded to an earlier peak hardness value is observed. However, extremely slow cooling processes will lead to the significant consumption of alloy atoms, in which the driving force for aging precipitation decreases.

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