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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of In Situ Intermetallics on the Microstructural Array and Saline Corrosion Performance of Cast Al/WCp Composites
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Effects of In Situ Intermetallics on the Microstructural Array and Saline Corrosion Performance of Cast Al/WCp Composites

机译：原位金属间金属间质对铸造Al / WCP复合材料微观结构阵列和盐水腐蚀性能的影响

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摘要

Al-matrix composites, ex situ reinforced with WC nanoparticles and in situ reinforced with Al~(3)(Ti,W), Al~(12)W, Al~(5)W and Al~(4)W, have been fabricated by casting assisted by K~(2)TiF~(6)wetting agent addition and mechanical stirring. A satisfactory particle incorporation and distribution accompanied by a high reactivity have been attained. The presence, topography, chemical composition of all included phases and their occurrence as clusters or single particles are clarified and justified. Al~(12)W is the predominant aluminide phase at WC?≤?1.5?vol.%. Al~(4)W (primarily) and Al~(5)W (secondarily) are the predominant aluminide phases at WC?≥?2.0?vol.%. WC nanoparticles have acted as heterogeneous nucleation sites to Al~(3)Ti particles. Reverse polarization tests in 3.5?wt.% NaCl show that the governing form of corrosion is intergranular corrosion of Al around Al~(3)FeSi~(2)eutectic, fine plates. The corrosion steps/mechanisms are identified. Clusters of aluminides and carbide nanoparticles, as well as intergranular WC nano-dispersoids and their Al-matrix have remained corrosion-free. The role of the aluminides combined with WC remaining nano-cores as inhibitors of the eutectic Al~(3)FeSi~(2)cathodic activity is highlighted.
机译：Al-Matrix复合材料，用WC纳米颗粒加固和用Al〜（3）（Ti，W），Al〜（12）W，Al〜（5）W和Al〜（4）W的原位增强了原位的原位和原位增强了通过K〜（2）TIF〜（6）润湿剂的铸造辅助制造加入和机械搅拌。已经获得了伴随高反应性的令人满意的颗粒掺入和分布。澄清并使所有阶段的存在，地形，化学成分及其作为簇或单颗粒的发生。 Al〜（12）W是WC的主要铝化阶段？≤≤≤1.5？5克。％。 Al〜（主要）和Al〜（二次）是WC？≥？2.0？Vol.％。％。 WC纳米粒子用作Al〜（3）Ti颗粒的异质成核位点。在3.5中的反向偏振试验中的3.5℃。％NaCl表明，腐蚀的控制形式是Al〜（3）FeSi〜（2）共晶，细板的晶间腐蚀。识别腐蚀步骤/机制。铝化物和碳化物纳米粒子的簇，以及晶间WC纳米分散体及其Al-基质仍然存在腐蚀。铝聚合物与WC剩余纳米芯的作用突出了共晶Al〜（3）FeSi〜（2）阴极活性的抑制剂。

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