含铁镍Al-Cu-Mg系合金的组织与性能研究

发布时间：2018-06-22 00:56

  本文选题：Al-Cu-Mg合金 + 微观组织结构　； 参考：《沈阳航空航天大学》2015年硕士论文

【摘要】：参考Al-Cu-Mg合金的组织及热稳定性的相关研究，本课题提出了利用合金化的方法来提高合金的性能。研究通过调整Cu、Mg元素含量并添加适量的Fe、Ni元素，制备出新型Al-Cu-Mg合金。由于合金中细小弥散的强化相颗粒对合金热暴露条件下组织的热稳定性起到积极作用，同时也可提高合金的力学性能。粗大的富铁镍金属间化合物往往作为应力集中源而降低合金的机械性能。该相对合金性能降低的程度取决于金属间化合物的大小，形状和类型。因此，深入了解这些富铁镍金属间化合物在固化过程中的相变情况、强化相的生长情况及形成机制是十分必要的。本实验通过OM，，SEM，EDS，XRD，DSC等检测手段对合金组织进行了表征分析。结果显示对于Al-Cu-Mg合金，随着Cu含量的增加，Al2CuMg相数量增多并且Al9FeNi相数量减少。通过双级均匀化处理、热挤压工艺、固溶时效处理发现Fe、Ni元素的添加对合金微观组织和力学性能影响明显。在室温拉伸试验过程中，合金具有较高抗拉强度。通过高温拉伸试验结果显示，具有均匀稳定组织的新型Al-Cu-Mg合金，在120℃高温环境下表现良好的综合性能。
[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

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