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首页> 美国卫生研究院文献>Materials >Superior Strength and Ductility of In Situ Nano TiB2/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment
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Superior Strength and Ductility of In Situ Nano TiB2/Al–Cu–Mg Composites by Cold Rolling and Post-Aging Treatment

机译：冷轧和后时效处理原位纳米TiB2 / Al-Cu-Mg复合材料的优异强度和延展性

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摘要

In this work, the combination of cold rolling with post-aging treatment is developed to achieve the optimal strength–ductility for the in situ nano TiB /Al–Cu–Mg composite. The microstructure and mechanical properties of the composite subjected to 20% thickness reduction of cold rolling at room temperature and their evolutions upon post-aging at different temperatures were investigated by means of a tensile test, differential scanning calorimetry, scanning electron microscopy, and transmission electron microscopy. It was found that the TiB particles were effective in dislocation pinning and accumulation during the cold-rolling process. The tensile tests indicated that both the yield and ultimate tensile strengths of the cold-rolling sample increased a lot due to the dislocation strengthening and precipitation strengthening generated by dynamic precipitation during cold rolling in comparison with the conventional T6 sample. After aging at 100 °C/12 h, the elongation to failure reached ~8.4%, which was higher than the conventional T6 sample. Meanwhile, there was also a dramatic increase of strength. The yield and ultimate tensile strengths are ~644 MPa and ~726 MPa, respectively. This remarkable strength–ductility combination was due to the modified microstructure caused prior to artificial aging by the cold-rolling method and the formation of nanosized Guinier–Preston–Bagaryatsky (GPB) zones. The underlying mechanisms related to the superior strength–ductility combination were discussed regarding the microstructural characteristics in the composite.
机译：在这项工作中，开发了冷轧与时效处理相结合的方法，以实现原位纳米TiB / Al-Cu-Mg复合材料的最佳强度-延展性。通过拉伸试验，差示扫描量热法，扫描电子显微镜和透射电子研究了在室温下冷轧厚度降低20％的复合材料的组织和力学性能，以及在不同温度下时效后的演变。显微镜检查。发现在冷轧过程中，TiB颗粒在位错钉扎和聚集方面有效。拉伸试验表明，与传统的T6样品相比，由于冷轧过程中动态沉淀产生的位错强化和沉淀强化，冷轧样品的屈服强度和极限抗拉强度均大大提高。在100°C / 12 h老化后，断裂伸长率达到〜8.4％，高于传统的T6样品。同时，力量也急剧增加。屈服强度和极限抗拉强度分别为〜644 MPa和〜726 MPa。这种出色的强度-延展性结合是由于在冷轧法进行人工时效之前引起的微观结构改变，以及形成了纳米级的Guinier-Preston-Bagaryatsky（GPB）区。关于复合材料的微观结构特征，讨论了与优异的强度-延性组合相关的基本机理。

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