電場(chǎng)對(duì)2E12鋁合金中S相析出動(dòng)力學(xué)的影響
發(fā)布人：上海艾荔艾金屬材料有限公司www.bt990.com.cn
更新時(shí)間：2015-12-22
采用示差掃描量熱法(DSC)，研究2E12鋁合金在190 ℃時(shí)效過程中施加強(qiáng)電場(chǎng)(±9 kV/cm)對(duì)合金析出的動(dòng)力學(xué)的影響，并探討電場(chǎng)影響合金時(shí)效過程的微觀機(jī)理。
電場(chǎng)對(duì)2E12鋁合金中S相析出動(dòng)力學(xué)的影響Effect of electric field on kinetics of formation of S phase in2E12 aluminum alloy采用示差掃描量熱法(DSC)，研究2E12鋁合金在190 ℃時(shí)效過程中施加強(qiáng)電場(chǎng)(±9 kV/cm)對(duì)合金析出的動(dòng)力學(xué)的影響，并探討電場(chǎng)影響合金時(shí)效過程的微觀機(jī)理。結(jié)果表明：時(shí)效時(shí)施加強(qiáng)電場(chǎng)促進(jìn)了合金中Ⅰ型S相向Ⅱ型S相的轉(zhuǎn)變，使得析出峰提前；未施加電場(chǎng)的合金樣品具有更高的過飽和度、析出焓、析出相體積分?jǐn)?shù)及析出速率；強(qiáng)電場(chǎng)作用降低合金中空位與溶質(zhì)原子之間的結(jié)合能，進(jìn)而降低S相析出激活能。根據(jù)DSC結(jié)果對(duì)S相析出激活能進(jìn)行Kissinger方法和普適積分法計(jì)算發(fā)現(xiàn)，時(shí)效過程中施加電場(chǎng)與未施加電場(chǎng)相比，S相激活能分別降低7.9~12.7 kJ/mol和6.8~22.6 kJ/mol。
The influence of electric field (±9 kV/cm) on the aging kinetics and mechanism of 2E12 aluminum alloy during aging at 190 ℃ were investigated by differential scanning calorimetry (DSC). The results show that the transformation of S phase from type Ⅰ to type Ⅱ is promoted by applying electric field. The S phase formation peak in DSC curves under electric field shifts to a lower temperature. The supersaturation degree, formation enthalpy, volume fraction of precipitates and precipitation rate of aged alloy without electric field are higher than those with electric field. The bonding energy between the vacancy and solute atom is decreased by introducing electric field, causing lower activation energies of S phase formation. Based on the DSC results, the activation energies of S phases with electric field in aging are 7.9 ?12.7 kJ/mol and 6.8?22.6 kJ/mol lower than those without electric field calculated by the method of Kissinger and general integration measurement, respectively.
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