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合金成分和冷卻速率對Al-Cu合金凝固過程中初生Al2Cu相生長形貌的影響
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-30
針對Al-Cu合金進行研究，研究合金成分、冷卻速率等對合金凝固組織及Al2Cu相生長行為的影響，研究結果對Al-Cu系合金開發、組織及性能控制提供參考。
合金成分和冷卻速率對Al-Cu合金凝固過程中初生Al2Cu相生長形貌的影響EFFECT OF ALLOY COMPOSITION AND COOLING RATE ON THE?PRIMARY Al2Cu PHASE GROWTH MORPHOLOGY OF Al - Cu ALLOY?DURING SOLIDIFICATION
對 Al-xCu(x=30,40,45,50,質量分數,%)合金凝固組織進行了系統的觀察。結果表明，隨合金中Cu含量由30%（質量分數，下同）增加到50%，合金中初生Al2Cu相形貌由枝晶狀逐漸轉變為棱面狀，表明Al2Cu相的生長方式由非小平面生長轉變為小平面生長。冷卻速率對初生Al2Cu相生長形貌具有重要影響，冷卻速率較低時，初生 Al2Cu 相為規則的棱面狀；隨著冷卻速率增大，初生 Al2Cu 相逐漸轉變為不規則的非棱面狀，表明 Al2Cu 相的生長方式由小平面生長轉變為非小平面生長。對凝固過程中初生 Al2Cu相形貌轉變研究發現，Cu含量為45%時，初生 Al2Cu 相形貌由枝晶狀向方形轉變；Cu 含量增加到 50%時，初生 Al2Cu相形貌由枝晶狀轉變為網狀。?
Intermetallic compounds have unique natures. Due to the natures of high temperature resistance,?high strength and high hardness, intermetallic compounds always exist as strengthening phase in many alloys.?The primary Al2Cu phase in Al-Cu alloys is an intermetallic phase. The morphology, size, and distribution of?intermetallic compounds phases have largely effects on the mechanical properties of materials.Morphological?evolution of intermetallic compoundswas necessarily theoretical basis for intermetallic compound materials for?the active control of size, morphology and improving the performance of intermetallic compound materials in the?solidification process.At present, there are many reports on the research of Al-Cu alloys. The main research is?focused on the eutectic point and 4.7%Cu (atomic percentage)of Al-Cu alloys, but other composition alloys are?less considered. The growth mechanism of Al2Cu phase and the primary Al2Cu phase structure of Al-Cu alloy are?studied recently. However, the specific growth mechanism of Al2Cu phase is currently not very clear. Alloy?composition and cooling rate are often encountered in the ordinary metal melting and solidification. The change?of solidification conditions will lead to the transformation of heat and solute in the melt, which will formdifferent?morphologies.In this paper, the effect of alloy composition and cooling rateon morphologies and growth?behavior of Al2Cu phase in Al-Cu alloyswas studied. Through the microstructure observation of?Al-xCu(x=30,40,45,50,quality percentage,similarly hereinafter) alloys, it was found that primary Al2Cu phase?morphologies transformed fromdendritic shape to regular bulk with the Cucontentincreased from 30% to 50% in?the alloy, which indicated that Al2Cu phase growth changed from non-faceted growth to faceted growth. Cooling?rate also had a vital influence on primary Al2Cu phase morphologies. Under low cooling rate, primary Al2Cu?phase morphologieswere regular bulk.Themorphologies of primaryAl2Cu phases weretransformed into dendritic?shapewith the increasing of cooling rate. Thespecific morphology transformation rule of primary Al2Cu phases in?Al-Cu alloys was also studied in the solidification process. It was found that when Cu content was 45%, the?morphology transformation of primary Al2Cu phases was from dendritic shape to squaremorphologies. While?when Cu content was increased to 50%,the morphology transformation ofprimary Al2Cu phaseswas from?dendritic shape to reticular morphologies.
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