Aluminium alloys with controlled melting ranges for process-integrated foaming during extrusion

具有受控熔化范围的铝合金，用于挤压过程中的工艺集成发泡

基本信息

批准号：
324394568
负责人：
Professor Dr.-Ing. Hans Jürgen Maier
金额：
--
依托单位：
Institut für Werkstoffkunde (IW)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/324394568?language=en
关键词：
Aluminium alloys controlled melting ranges

项目摘要

Foam-filled extruded profiles offer an excellent combination of low density and good mechanical properties. However, the downside of these products is that either foamed inlays need to be inserted into and then glued to the extruded profiles, or foamable precursors have to be inserted into the profiles and foamed in a separate heat treatment step. Alternatively, a foamable precursor and a structural material can be co-extruded together and then foamed in a subsequent heat treatment step. However, these production processes require additional handling and heat treatment steps. The objective of the proposed research project is the development of fundamental knowledge for the direct foam-filling of extruded hollow profiles using the process heat generated during extrusion. In the first step, foamable precursors will be studied. These precursors will be based on low melting aluminium hard solders. Their melting range needs to be adjusted to the forming temperature of the structural material, which in this case will be the aluminium wrought alloy EN AW 6082. The most important point to be considered for the development of the aluminium hard solders is the onset of the foaming phase, as this has occur simultaneously while the material enters the forming zone or when it exits the die. Promising alloys will be investigated based on their foaming behaviour determined in free foaming tests. This will include addition of stabilising alloying elements and foaming agents, adapted for processing in extrusion. An additional change of the processing route for the foamable precursor, i.e. a second extrusion process, is envisaged to. Firstly, to further enhance the foaming behaviour and secondly, to improve the material usage during processing. Subsequent co-extrusion trials, using a special extrusion die allowing for an improved control of the process conditions, will allow for obtaining a process window for the foaming phase during extrusion. Finally, a prototype of an extruded and foam-filled tube will be tested to evaluate the microstructural and mechanical properties by both non-destructive and destructive testing methods.

充满泡沫的挤出轮廓提供了低密度和良好机械性能的极好组合。但是，这些产品的缺点是，要么需要将泡沫的嵌体插入，然后粘在挤出的轮廓上，要么必须将可泡沫的前体插入轮廓中，并在单独的热处理步骤中泡沫。另外，可以将可泡沫的前体和结构材料共同挖掘在一起，然后在随后的热处理步骤中进行泡沫。但是，这些生产过程需要其他处理和热处理步骤。拟议的研究项目的目的是开发基本知识，用于使用挤出过程中产生的过程热量直接填充挤压空心剖面的泡沫。在第一步中，将研究可泡沫的前体。这些前体将基于低熔化的铝硬焊料。它们的熔融范围需要调整为结构材料的形成温度，在这种情况下，这将是铝制合金EN AW 6082。铝制硬焊料的开发最重要的一点是泡沫阶段的开始，因为这是同时发生的，而材料会导致形成区域或当前的死亡。有希望的合金将根据其在免费泡沫测试中确定的泡沫行为进行研究。这将包括添加稳定合金元件和泡沫剂，适合于挤出。设想将泡沫前体的加工路线（即第二个挤压过程）进行的额外更改。首先，为了进一步增强泡沫行为，其次，以改善处理过程中的材料使用情况。随后使用特殊的挤压模具允许改善过程条件的共同排序试验，将允许在挤出过程中获得泡沫阶段的过程窗口。最后，将测试挤出和泡沫填充管的原型，以通过非破坏性和破坏性测试方法评估微观结构和机械性能。