Study on the Behavior of a Surface Oxide Layer during hot Consolidation and Extrusion of Splat-Quenched Aluminum Alloy Tapes.

板淬火铝合金带材热固结和挤压过程中表面氧化层行为的研究。

• 批准号: 60550519
• 负责人: MURAKAMI Yotaro
• 金额: $ 1.22万
• 依托单位: Faculty of Engineering, Kansai University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550519/
• 关键词: Rapid Solidification; Powder Metullurgy; Al-Li Alloys; Al-Cr-Zr Alloys; 表面酸化皮膜の挙動

In recent years, a powder metallurgy (P/M) method combined with rapid solidification (RS) techniques have attracted considerable attention, because this process could improve elevated temperature mechanical properties and also low density-high modulus. However, aluminum tapes inherently exhibit a surface oxide layer, which affects detrimentally mechanical properties and particularly ductility of P/M products when incompletely broken up or nonuniformly distributed during consolidations and hot working.The object of this study is to clarify the behavior of surface oxide layer during hot consolidation and extrusion of splat-quenched two kinds of alloys, one is Al-Cr-Zr alloys and the other is Al-Li-Zr containing higher concentration of Li than that in an ordinary I/M alloy.In splat-quenching techniques, molten droplets were injected into two kinds of atomospheres, one is experimental laboratory air and the other is dry argon to change the degree of oxidation and hydration.The microstructures of these tapes in the conditions of as-splat as well as heat treated by means of optical, transmission and scanning electron microscopy, selected area electron diffraction and X-ray.The tapes were hot pressed in a vacuum to produce billete, and hot pressed billete were subsequently hot extruded to make wires by extrusion ratio 1 : 20 or 1 : 18.In the hot pressed billets , oxide layers still remains on the prior tape boundary area, and after hot extrusion, the oxide layer were broken up into film fragments.However, the ductility was concluded to be quite different between Al-Cr-Zr and Al-Li-Zr alloys.In the case of Al-Cr-Zr alloys, the ductility was improved by the sufficient hot extrusion, but it was not the case for Al-Li-Zr where it may be necessary to avoid completely a formation of oxide surface layers.

近年来，一种粉末冶金（P/M）方法与快速固化（RS）技术相结合引起了极大的关注，因为此过程可以改善温度机械性能的升高和低密度高的模量。然而，铝胶带固有地表现出表面氧化物层，这会影响有害机械性能，尤其是P/M产物的特性，当不完全分解或在巩固和热工作过程中分散或不均匀分布时，该研究的对象是阐明所有在热和挤压的杂种中，均为氧化氧化物层的行为。与普通的I/M合金相比，含有更高的LI浓度的al-Li-Zr。在Splat淬灭技术中，将熔融的液滴注入两种类型的原子球中，一种是实验性的空气，另一种是干氩，以改变氧化和水合的氧化度。将显微镜，选定的区域电子衍射和X射线。将磁带热压在真空中，以产生卷天卷曲，随后被热的弯曲的弯曲式挤压，以挤压比1：20或1：18.在热的弯曲的弯曲器中，氧化物层仍在先前的胶带边界区域上，氧化物层仍然是毛皮，氧化物在又一次挤出了，又是毛茸茸的，又是毛茸茸的，又是在挤出的片段。在Al-Cr-ZR合金的情况下，Al-CR-ZR和Al-Li-ZR合金之间的不同，延展性通过足够的热挤出来改善，但是对于Al-Li-ZR来说并非如此，在这种情况下，避免完全避免氧化物表面层的形成可能是必要的。