本文選題：Al-Cu-Mg合金 + 微觀組織結(jié)構(gòu)�。� 參考：《沈陽航空航天大學(xué)》2015年碩士論文

【摘要】：參考Al-Cu-Mg合金的組織及熱穩(wěn)定性的相關(guān)研究，本課題提出了利用合金化的方法來提高合金的性能。研究通過調(diào)整Cu、Mg元素含量并添加適量的Fe、Ni元素，制備出新型Al-Cu-Mg合金。由于合金中細小彌散的強化相顆粒對合金熱暴露條件下組織的熱穩(wěn)定性起到積極作用，同時也可提高合金的力學(xué)性能。粗大的富鐵鎳金屬間化合物往往作為應(yīng)力集中源而降低合金的機械性能。該相對合金性能降低的程度取決于金屬間化合物的大小，形狀和類型。因此，深入了解這些富鐵鎳金屬間化合物在固化過程中的相變情況、強化相的生長情況及形成機制是十分必要的。本實驗通過OM，，SEM，EDS，XRD，DSC等檢測手段對合金組織進行了表征分析。結(jié)果顯示對于Al-Cu-Mg合金，隨著Cu含量的增加，Al2CuMg相數(shù)量增多并且Al9FeNi相數(shù)量減少。通過雙級均勻化處理、熱擠壓工藝、固溶時效處理發(fā)現(xiàn)Fe、Ni元素的添加對合金微觀組織和力學(xué)性能影響明顯。在室溫拉伸試驗過程中，合金具有較高抗拉強度。通過高溫拉伸試驗結(jié)果顯示，具有均勻穩(wěn)定組織的新型Al-Cu-Mg合金，在120℃高溫環(huán)境下表現(xiàn)良好的綜合性能。
[Abstract]:Referring to the research on the microstructure and thermal stability of Al-Cu-Mg alloy, the alloying method is proposed to improve the properties of the alloy. A new type of Al-Cu-Mg alloy was prepared by adjusting the content of Cu ~ (2 +) mg and adding appropriate amount of Fe ~ (2 +) Ni. Because the fine dispersed particles in the alloy play a positive role in the thermal stability of the alloy under thermal exposure, the mechanical properties of the alloy can also be improved. Coarse iron-rich nickel-rich intermetallic compounds are often used as stress concentration sources to reduce the mechanical properties of the alloys. The extent to which the relative properties of the alloy are reduced depends on the size, shape and type of intermetallic compounds. Therefore, it is necessary to understand the phase transition during solidification of these iron-rich nickel intermetallic compounds and the growth and formation mechanism of the strengthening phase. In this experiment, the microstructure of the alloy was characterized by means of OMSEMN EDSX, XRD, DSC and so on. The results show that for Al-Cu-Mg alloy, the number of Al _ 2Cu _ mg phase increases and the number of Al _ 9FeNi phase decreases with the increase of Cu content. Through two-stage homogenization, hot extrusion and solution aging treatment, it was found that the addition of Fe _ (2) Ni had an obvious effect on the microstructure and mechanical properties of the alloy. During the tensile test at room temperature, the alloy has high tensile strength. The results of tensile test at high temperature show that the new Al-Cu-Mg alloy with uniform and stable microstructure exhibits good comprehensive properties at 120 鈩

本文編號：2050810