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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Effects of Processing Parameters on the Microstructures and Mechanical Properties of In Situ (AI_3Ti + Al_2O_3)/AI Composites Fabricated by Hot Pressing and Subsequent Friction-Stir Processing
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Effects of Processing Parameters on the Microstructures and Mechanical Properties of In Situ (AI_3Ti + Al_2O_3)/AI Composites Fabricated by Hot Pressing and Subsequent Friction-Stir Processing

机译：工艺参数对热压后搅拌摩擦加工原位（AI_3Ti + Al_2O_3）/ Al复合材料的组织和力学性能的影响

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摘要

In situ (AI_3Ti + Al_2O_3)/A1 composites were fabricated in an Al-TiO_2 system by the combination of hot pressing (HP) and friction-stir processing (FSP). The effects of HP and FSP parameters on the microstructures and mechanical properties of the in situ composites were studied. The Al-TiO_2 reaction extent increased with increasing the temperature and holding time of HP. Subsequent FSP not only induced Al-TiO_2 reaction, resulting in the formation of nanosized Al_3Ti and Al_2O_3, but also rounded the polygonal Al_3Ti particles formed during HP. The tensile strength of the FSP sample in which the Al-TiO_2 reaction took place completely during HP was lower than that of the FSP samples in which the Al-TiO_2 reaction took place hardly or partly during HP. For the FSP samples in which the Al-TiO_2 reaction took place hardly during HP, the volume fraction of reinforcing particles increased with decreasing the traverse speed, resulting in the increase in tensile strength of the FSP samples. At a traverse speed of 25 mm/min, increasing the rotation rate from 1000 to 2000 rpm produced little influence on the microstructures and mechanical properties of the in situ composites. Additional 2-pass FSP in water refined the matrix grains, resulting in the significant increase in the tensile strength.
机译：通过热压（HP）和搅拌摩擦加工（FSP）的组合，在Al-TiO_2体系中制备了原位（AI_3Ti + Al_2O_3）/ Al复合材料。研究了HP和FSP参数对原位复合材料的微观结构和力学性能的影响。 Al-TiO_2反应程度随HP温度和保温时间的增加而增加。随后的FSP不仅诱导了Al-TiO_2反应，导致形成了纳米尺寸的Al_3Ti和Al_2O_3，而且还使HP中形成的多边形Al_3Ti颗粒变圆了。在HP期间完全发生Al-TiO_2反应的FSP样品的拉伸强度低于在HP期间几乎或部分发生Al-TiO_2反应的FSP样品的拉伸强度。对于在HP期间几乎不发生Al-TiO_2反应的FSP样品，增强颗粒的体积分数随行进速度的降低而增加，从而导致FSP样品的拉伸强度增加。在25 mm / min的横向速度下，将转速从1000 rpm增加到2000 rpm对原位复合材料的微观结构和力学性能几乎没有影响。水中额外的2道FSP精制了基体晶粒，从而显着提高了拉伸强度。

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