Effect of reaction temperature on the microstructures and mechanical properties of high-intensity ultrasonic assisted in-situ Al3Ti/2024 Al composites
Effect of reaction temperature on the microstructures and mechanical properties of high-intensity ultrasonic assisted in-situ Al3Ti/2024 Al composites
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DOI：
10.1016/j.jallcom.2016.01.121
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发表时间：
2016-05
影响因子：
6.2
通讯作者：
Jing‐Kai Qin;Gang Chen;X. Ji;Xiaoguo Song;N. Hu;Fei Han;Z. Du
中科院分区：
文献类型：
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作者：
Jing‐Kai Qin;Gang Chen;X. Ji;Xiaoguo Song;N. Hu;Fei Han;Z. Du
采用高强度超声辅助原位铸造法制备了Al 3 Ti/2024 Al复合材料。研究了反应温度对原位复合材料组织和力学性能的影响。结果表明，超声振动15 min后，在低温（735 °C和785 °C）下，Ti颗粒与Al熔体的反应不完全。当温度升高到835 °C时，所有Ti添加剂与Al熔体反应形成细小的Al 3 Ti颗粒，其均匀地分布在α-Al基体中。随着温度的升高，α-Al基体的平均晶粒尺寸减小，屈服强度显著提高。在835 °C下制备的复合材料的抗拉强度和屈服强度分别为446 MPa和357 MPa，比未经超声处理的复合材料的抗拉强度和屈服强度提高了30%。研究了超声振动对Al 3 Ti颗粒形成的影响。研究了原位生成Al 3 Ti颗粒对α-Al基体晶粒细化的作用。并对自生Al 3 Ti/Al复合材料的强化机理进行了探讨。
Al3Ti/2024 Al composites were fabricated by high-intensity ultrasonic assisted in-situ casting method. The effect of reaction temperature on microstructures and mechanical properties of the in-situ composites was studied. The results show that the reaction between Ti particles and Al melt was incomplete at low temperatures (e.g. 735 °C and 785 °C) after ultrasonic vibration for 15 min. When the temperature was increased to 835 °C, all Ti additions reacted with the Al melt to form fine Al3Ti particles which are evenly distributed in the α-Al matrix. As the temperature increasing, the average grain size of α-Al matrix decreased, while the yield strength was improved significantly. The ultimate tensile strength and yield strength of the composite which was fabricated at 835 °C were 446 MPa and 357 MPa, respectively, which are increased by 30% compared with those of the composite without ultrasonic treatment. Moreover, the effect of ultrasonic vibration on formation of Al3Ti particles was studied. The effect of in-situ formed Al3Ti particles on grain refinement of the α-Al matrix was presented. The strengthening mechanism of the in-situ Al3Ti/Al composites was also discussed.