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Ultrasound-Assisted Liquid-Phase Synthesis and Mechanical Properties of Aluminum Matrix Nanocomposites Incorporating Boride Nanocrystals
Small ( IF 13.0 ) Pub Date : 2021-11-12 , DOI: 10.1002/smll.202104091 Binghua Ma 1, 2 , Isabel Gómez-Recio 1 , Léo Mazerolles 3 , Pierre-Emmanuel Mazeran 4 , Clément Sanchez 1 , Stéphane Delalande 2 , David Portehault 1
Small ( IF 13.0 ) Pub Date : 2021-11-12 , DOI: 10.1002/smll.202104091 Binghua Ma 1, 2 , Isabel Gómez-Recio 1 , Léo Mazerolles 3 , Pierre-Emmanuel Mazeran 4 , Clément Sanchez 1 , Stéphane Delalande 2 , David Portehault 1
Affiliation
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Incorporating boride nanocrystals could significantly impact the mechanical properties of aluminum alloys. Molten salts synthesis offers opportunities to fabricate superhard boride nanoparticles, which can sustain the harsh conditions during the liquid-phase design of metallic nanocomposites. Here hafnium diboride-aluminum nanocomposites are unveiled from molten salt-derived HfB2 nanoparticles sequentially dispersed in aluminum by ultrasound treatment. The structure and size of the nanocrystals are retained in the final nanocomposites, supporting their high chemical stability. Semicoherent interfaces between the nanoparticles and the matrix are then evidenced by TEM, suggesting that the nanocrystals could promote heterogeneous nucleation of Al and then limit the Al grain size to ≈20 µm. Nanoindentation measurements reveal significant grain boundary strengthening and grain refinement effects. It is finally shown that HfB2 nanoparticles also enable a decrease in matrix grain size and an increase in the hardness of the AlSi7Cu0.5Mg0.3 alloy. These proof-of-concept materials are paving the way to light-weight Al matrix nanocomposites doped by molten-salt synthesized nanoparticles.
中文翻译：
含硼化物纳米晶体的铝基纳米复合材料的超声辅助液相合成及力学性能
掺入硼化物纳米晶体可以显着影响铝合金的机械性能。熔盐合成为制造超硬硼化物纳米粒子提供了机会，该纳米粒子可以在金属纳米复合材料的液相设计过程中承受恶劣的条件。在这里，从熔融盐衍生的 HfB 2中揭示了二硼化铪-铝纳米复合材料纳米粒子通过超声处理依次分散在铝中。纳米晶体的结构和尺寸保留在最终的纳米复合材料中，从而支持它们的高化学稳定性。然后通过TEM证明纳米颗粒和基体之间的半相干界面，表明纳米晶体可以促进Al的异质成核，然后将Al晶粒尺寸限制在≈20 µm。纳米压痕测量揭示了显着的晶界强化和晶粒细化效果。最后表明，HfB 2纳米颗粒还能够减小基体晶粒尺寸并提高 AlSi 7 Cu 0.5 Mg 0.3的硬度合金。这些概念验证材料为熔盐合成纳米粒子掺杂的轻质铝基纳米复合材料铺平了道路。
更新日期：2021-11-12
中文翻译：
含硼化物纳米晶体的铝基纳米复合材料的超声辅助液相合成及力学性能
掺入硼化物纳米晶体可以显着影响铝合金的机械性能。熔盐合成为制造超硬硼化物纳米粒子提供了机会，该纳米粒子可以在金属纳米复合材料的液相设计过程中承受恶劣的条件。在这里，从熔融盐衍生的 HfB 2中揭示了二硼化铪-铝纳米复合材料纳米粒子通过超声处理依次分散在铝中。纳米晶体的结构和尺寸保留在最终的纳米复合材料中，从而支持它们的高化学稳定性。然后通过TEM证明纳米颗粒和基体之间的半相干界面，表明纳米晶体可以促进Al的异质成核，然后将Al晶粒尺寸限制在≈20 µm。纳米压痕测量揭示了显着的晶界强化和晶粒细化效果。最后表明，HfB 2纳米颗粒还能够减小基体晶粒尺寸并提高 AlSi 7 Cu 0.5 Mg 0.3的硬度合金。这些概念验证材料为熔盐合成纳米粒子掺杂的轻质铝基纳米复合材料铺平了道路。
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