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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of non-isothermal aging on microstructure, mechanical properties and corrosion resistance of 2A14 aluminum alloy
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Effects of non-isothermal aging on microstructure, mechanical properties and corrosion resistance of 2A14 aluminum alloy

机译：非等温老化对2A14铝合金微观结构，力学性能和耐腐蚀性的影响

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摘要

The microstructure, mechanical properties and intergranular corrosion (IGC) resistance of 2A14 aluminum alloy subjected to several non-isothermal aging (NIA) treatments have been investigated. When target aging temperature is 210 degrees C during NIA, the hardness at the heating rate of 10 degrees C/h are higher than that at the heating rate of 20 degrees C/h. A slight decline of hardness occurs when the temperature is beyond 200 degrees C during the heating stage of NIA process, while the hardness turns its step to improve at approximately 140 degrees C at the cooling stage. This is due to the mutual competition between the coarsening of precipitates and secondary precipitation during the cooling process. Compared with isothermal peak (T6) aging temper, The NIA process ((40-210, 10 degrees C/h) + (210-180, 20 degrees C/h)) makes the elongation and impact toughness of 2A14 aluminum alloy increase by 6.5% and 4.4%, respectively, while yield strength and fracture strength remain about the same. The co-precipitation of theta' and Q' precipitates can be observed for various aging conditions, but different from T6 aging, the NIA process leads to the high-density theta' precipitates with wider length range. This characteristic of theta' phase contributes to better mechanical performance of 2A14 aluminum alloy after the NIA process. In addition, the IGC resistance of the non-isothermal aged 2A14 alloy slightly decreases compared with that after T6 aging, which is closely linked with the widening of PFZ and the increase of potential difference between the PFZ and the matrix after the NIA process. (C) 2020 Elsevier B.V. All rights reserved.
机译：研究了经受几种非等温老化（NIA）处理的2A14铝合金的微观结构，机械性能和晶间腐蚀（IGC）电阻。当靶老化温度为210℃时，加热速率为10℃/ h的硬度高于20℃/ h的加热速率。当在NIA工艺的加热阶段期间温度超过200摄氏度时，发生硬度的轻微下降，而硬度将其步骤变为在冷却阶段的大约140℃下改善。这是由于在冷却过程中沉淀物和二次沉淀之间的互化之间的相互竞争。与等温峰（T6）老化的调味相比，NIA工艺（（40-210,10c / h）+（210-180,20℃/ h））使得2A14铝合金增加的伸长和冲击韧性分别为6.5％和4.4％，同时屈服强度和断裂强度仍然约为相同。对于各种老化条件，可以观察到θ和Q'沉淀物的共沉淀，但不同于T6老化，NIA工艺导致高密度θ'沉淀，具有较宽的长度范围。该阶段的这种特性有助于在NIA工艺后的2A14铝合金的更好力学性能。此外，与T6老化后，非等温老年2A14合金的IGC电阻与T6老化相比略微降低，这与PFZ的加宽密切相关，并且在NIA工艺后PFZ和基质之间的电位差的增加。 （c）2020 Elsevier B.v.保留所有权利。

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