Al-Mg-Si合金中針棒狀析出相時效析出動力學及強化模擬研究
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-05-28
通過與計算相圖數(shù)據(jù)庫相耦合, 建立了 Al-Mg-Si 三元合金體系中針棒狀析出相時效析出動力學和時效強化模型, 考慮了析出相形貌對形核、生長、粗化以及強化效果的影響. 通過該模型可以獲得不同時效工藝下析出相微觀組織特征參數(shù)的變化及對應(yīng)的屈服強度變化.
Al-Mg-Si合金中針棒狀析出相時效析出動力學及強化模擬研究MODELLING INVESTIGATION OF PRECIPITATION KINETICS AND?STRENGTHENING FOR NEEDLE/ROD-SHAPED PRECIPITATES IN?Al-Mg-Si ALLOYS通過與計算相圖數(shù)據(jù)庫相耦合, 建立了 Al-Mg-Si 三元合金體系中針棒狀析出相時效析出動力學和時效強化模型, 考慮了析出相形貌對形核、生長、粗化以及強化效果的影響. 通過該模型可以獲得不同時效工藝下析出相微觀組織特征參數(shù)的變化及對應(yīng)的屈服強度變化. 利用該模型模擬了 Al-Mg-Si 合金在不同時效工藝條件下的時效析出過程和屈服強度變化, 并與實驗結(jié)果及 Lifshitz-Slyozov-Wanger 粗化模型計算結(jié)果進行了對比. 基于模型研究并分析了析出相長徑比、界面能、合金元素含量以及析出相成分對 Al-Mg-Si 合金時效析出動力和強化效果的影響. 結(jié)果表明: 不同的界面能和長徑比會影響形核密度和析出相尺寸, 進而影響合金屈服強度. 增加基體中 Mg 含量可以促進時效析出, 提高合金屈服強度, 而基體中 Si 含量的增加對合金屈服強度并不產(chǎn)生明顯影響.?
The aging hardening is the main strengthening mechanism of Al-Mg-Si alloys, and the hardening effect is?determined by the microstructural features of precipitates including the morphology, composition, volume faction, nucleation density?as well as the size distribution. In present work, an integrated mathematical model coupling with the CALPHAD software is?developed to simulate the precipitation kinetics and strengthening effects of needle/rod-shaped precipitates in ternary Al-Mg-Si?aluminum alloys. This model takes into account the effects of morphology on the nucleation, growth and coarsening of precipitates?and on the strengthening effects. The yield stress model accounts for the whole precipitate size distribution, shape of precipitates and?their specific spatial distribution based on the consideration of the competing shearing and bypassing strengthening mechanisms.?Application of the model to various aging treatments of Al-Mg-Si alloys is conducted and the predictions both for microstructural?features and yield stress are validated with experimental results and the predictions by LSW model. Using this model, the effects of?aspect ratio, interfacial energy, alloy composition and Mg/Si atom ratio in precipitates on precipitation kinetics and yield stress are?investigated and analyzed. The results reveal that the different interfacial energy and aspect ratio will affect the predicted density and?size of precipitate, and further has an influence on the prediction precision of yield stress. An increase of Mg content in the matrix of?Al-Mg-Si alloy will accelerate the precipitation and improve the?yield stress, while increasing the Si content in the matrix will?produce little influence on the yield stress.?
作為值得信賴的合作伙伴和高品質(zhì)金屬合金的半成品供應(yīng)商，艾荔艾擁有完善的服務(wù)體系和專業(yè)的團隊。在同客戶交易的過程中，我們力求根據(jù)不同的應(yīng)用需求將我們的產(chǎn)品做到精益求精。針對當前和未來的市場需求，艾荔艾致力于為客戶提供最佳的金屬材料解決方案。
AILIAI
has been a reliable partner and supplier of sophisticated and high-quality
semi-finished products maed of alloys. In dialogue with our customers, we
optimise our products to meet the specific application requirements. AILIAI
develops the best alloy material solutions for current and future
challenges.
獲取更多我們供應(yīng)的合金和服務(wù)信息，請致電086-021-67660801或發(fā)電子郵件[email protected]聯(lián)系我們，您也可以通過微博，微信，領(lǐng)英，XING，臉書和推特與我們互動。
For
more information on the alloys and services that we supply,?call
us?at
086-021-67660801 or email us at [email protected]. You can also get in touch
on social media, we are constantly active on?Weibo,?Weixin,?LinkedIn,?XING, Facebook?and?Twitter.