Consolidation of AA 7075-2 wt% ZrO2 Composite Powders by Severe Plastic Deformation via ECAP
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- 作者：S. E. Hernández-Martínez ; J. J. Cruz-Rivera…
- 关键词：Metal matrix composites (MMCs) ; Powder consolidation ; Severe plastic deformation (SPD)
- 刊名：Acta Metallurgica Sinica (English Letters)
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：29
- 期：10
- 页码：895-901
- 全文大小：1,373 KB
- 刊物主题：Metallic Materials; Spectroscopy/Spectrometry; Organometallic Chemistry; Tribology, Corrosion and Coatings; Nanotechnology; Characterization and Evaluation of Materials;
- 出版者：Springer Berlin Heidelberg
- ISSN：2194-1289
- 卷排序：29
文摘
The powders of the AA 7075-ZrO2 were mixed by mechanical milling, but it was found that the system presents a few disadvantages when processed by conventional sintering and hot extrusion, since intermetallic phases between ZrO2 particles and alloying elements were formed. Equal channel angular pressing (ECAP) processing was proposed as an alternative method to consolidate the composite where there is no intermetallic formation. The analysis of the ECAP process showed that the intermediate temperature (220 °C) produced a higher consolidation level than conventional sintering and hot extrusion (400 and 500 °C, respectively). This fact was supported by relative density analysis. In the case of the sintered and hot-extruded sample, the relative density exhibited a value of 0.95, while ECAP sample showed a value of 0.98. Hardness values show that microstructural refinement obtained during mechanical milling was preserved during ECAP processing even when it was carried out at 220 °C.