In situ copper–alumina composites
In situ copper–alumina composites
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DOI：
10.1016/j.msea.2013.07.074
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发表时间：
2013-11
期刊：
影响因子：
6.4
通讯作者：
C. Krüger;A. Mortensen
中科院分区：
文献类型：
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作者：
C. Krüger;A. Mortensen
我们提出了一种生产含有 25 至 30 vol.% 原位 Al2O3 的 Cu-Al 基复合材料的工艺。该复合材料是将Cu、Al、CuO混合粉末装入铜合金罐中，经压制、热处理和热加工而成。原位反应过程中微观结构的演变是由氧化铝薄膜的稳定生长控制的；如果使用足够的热镇流器处理样品，这些可以降低反应速率，从而防止热失控。所得氧化铝可通过热加工复合材料进行后续细化和分散，并通过反向（挤压/镦粗/挤压）变形获得最佳效果。由此产生的含有均匀分布的微米级氧化铝颗粒的Cu7wt.%Al的拉伸强度为848±44MPa，拉伸延展性为2.2±0.8%。
We present a process for the production of Cu–Al matrix composites containing between 25 and 30 vol.%in situAl2O3. The composites are prepared by pressing, heat-treating and hot working blended powders of Cu, Al and CuO packed into copper alloy cans. The evolution of the microstructure duringin situreaction is governed by the stable growth of alumina films; these mitigate the rate of reaction, preventing thermal runaway if samples are processed with sufficient thermal ballast. The resulting alumina is amenable to subsequent refinement and dispersion by hot working the composite, with reversed (extrusion/upsetting/extrusion) deformation giving best results. Cu7 wt.%Al containing homogeneously distributed micron-sized alumina particles thus produced has a tensile strength of 848±44 MPa and a tensile ductility of 2.2±0.8%.