本文選題：7050鋁合金 + 平面凝固��； 參考：《東北大學(xué)》2014年碩士論文

【摘要】：Al-Zn-Mg-Cu合金作為高強鋁合金,在航空航天領(lǐng)域及地面運載工具方面應(yīng)用廣泛,是極為關(guān)鍵的一類輕質(zhì)高強結(jié)構(gòu)材料。高強、高韌、耐腐蝕的鋁合金作為今后的主要發(fā)展方向具有重要的研究價值。近年來,隨著航空航天事業(yè)的不斷發(fā)展和國防現(xiàn)代化建設(shè)步伐的加快,我國對高性能的Al-Zn-Mg-Cu鋁合金板材的需求也日益緊迫。目前,在全世界范圍內(nèi)鋁合金鑄錠的商業(yè)化生產(chǎn)大部分是使用傳統(tǒng)的DC鑄造技術(shù),應(yīng)用平面凝固技術(shù)鑄造鋁合金鑄錠還比較少。本論文工作依托教育部優(yōu)先發(fā)展領(lǐng)域項目《鋁合金平面凝固技術(shù)研究》,以Al-Zn-Mg-Cu系超強合金中的7050鋁合金為研究對象,對平面凝固鑄造工藝進行探索性研究,設(shè)計并制造平面凝固鑄造設(shè)備,并對使用不同鑄造工藝時鑄錠的質(zhì)量進行檢測分析,研究實現(xiàn)平面凝固的可行性方案,為平面凝固技術(shù)的進一步完善打下基礎(chǔ),以期建立具有知識產(chǎn)權(quán)的完善的鋁合金平面凝固鑄造技術(shù),并最終實現(xiàn)這一技術(shù)的商業(yè)化應(yīng)用。 本論文主要得出以下結(jié)論： (1)考察研究了分流方式以及冷卻板材質(zhì)對熔體凝固前沿溫度場的影響,其中采用邊部分流、鋼制冷卻板鑄造時溫度場的分布均勻,可以較好地實現(xiàn)鋁合金的平面凝固。 (2)鑄錠中各位置Zn、Mg、Cu三種溶質(zhì)元素的含量均在平均值附近呈微幅波動,無明顯的宏觀偏析存在,基本達到了平面凝固的溶質(zhì)均勻化目標(biāo)。 (3)鑄錠的微觀組織研究表明,其凝固組織中a-A1均為等軸晶或等軸枝晶,與DC鑄造組織存在顯著差別。 (4)軋制處理后合金抗拉強度為350MPa,延伸率為12.22%,硬度和電導(dǎo)率分別為117.50HV和40.50Ms/mm；經(jīng)過時效處理后合金的抗拉強度達到545MPa,延伸率為13.33%、硬度和電導(dǎo)率分別為169.00HV和43.40Ms/mm。
[Abstract]:As a high-strength aluminum alloy, Al-Zn-Mg-Cu alloy is widely used in the field of aerospace and ground transport. It is a very important lightweight high strength structural material. High strength, high toughness and corrosion resistant aluminum alloy have important research value as the main development direction in the future. In recent years, with the continuous development of Aerospace industry and the development of aerospace industry, The pace of modernization of national defense is accelerating, and the demand for high performance Al-Zn-Mg-Cu aluminum alloy sheet is becoming increasingly urgent in our country. At present, the commercial production of aluminum alloy ingot in the world is mostly using the traditional DC casting technology, and the application of plane solidification technology to casting aluminum alloy ingot is still relatively small. This paper work relies on education. The research on aluminum alloy plane solidification technology in the Ministry of priority development field, 7050 aluminum alloy in Al-Zn-Mg-Cu superalloy is studied, the plane solidification casting process is researched, the plane solidification casting equipment is designed and manufactured, and the quality of the ingot in different casting processes is detected and analyzed. The feasibility of surface solidification has laid a foundation for the further improvement of the plane solidification technology, in order to establish a perfect aluminum alloy flat solidification casting technology with intellectual property, and finally realize the commercial application of this technology.
The main conclusions of this paper are as follows:
(1) the effect of the split flow mode and the material of the cooling plate on the temperature field of the melt solidification front is investigated and studied. The distribution of the temperature field is uniform when the steel cooling plate is cast, which can better realize the plane solidification of the aluminum alloy.
(2) the content of three kinds of solute elements of Zn, Mg, Cu in the ingot are slightly fluctuated near the average, and there is no obvious macro segregation, which basically achieves the homogenization target of the solute in the plane solidification.
(3) microstructure of the ingot shows that the a-A1 of the solidified structure is equiaxed or equiaxed dendrite, which is significantly different from that of DC casting.
(4) the tensile strength of the alloy after rolling is 350MPa, the elongation is 12.22%, the hardness and the conductivity are 117.50HV and 40.50Ms/mm, respectively, and the tensile strength of the alloy reaches 545MPa after aging treatment, the elongation is 13.33%, the hardness and the conductivity are 169.00HV and 43.40Ms/mm., respectively.

【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TG292

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