Mechanical Properties and Corrosion Resistance of an Al-Zn-Mg-Cu Aluminum Matrix Composite with In Situ Synthesis of Al
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Mechanical Properties and Corrosion Resistance of an Al-Zn-Mg-Cu Aluminum Matrix Composite with In Situ Synthesis of Al3Zr and ZrB2 by Mixed Salt Reaction Yongzhong Fu, Yuan Zhuang, Xiaojing Xu, Rikai Zhang, Peng Zhang, Hongbo Wei, Xiaopeng Jin, Zheng Liu, Bin Zhang, Jing Wu, and Xingbiao Sun Submitted: 22 May 2020 / Revised: 6 October 2020 / Accepted: 9 October 2020 The paper studied the microstructure and properties of (Al3Zr + ZrB2)p/Al-Zn-Mg-Cu composite by mixed salt reaction (MSR) in different states. The results show that the grain sizes of the aluminum matrix composite are similar and very small, and the average grain size of which is around 3.257 lm. Besides, the precompression and pre-recovery treatment can further improve the mechanical properties and the corrosion resistance. In the pre-recovery, solution, precompression and T6 aging process, the composite material has the best mechanical properties, the hardness and tensile strength of which reaches up to 258 HV and 666 MPa, respectively. Meanwhile, T76 aging is more effective on the exfoliation and intergranular corrosion resistance of the composite material than T6 aging. Keywords
(Al3Zr + ZrB2)p/Al-Zn-Mg-Cu, mixed salt reaction, pre-recovery, precompression, T6 and T76 aging
1. Introduction Aluminum matrix composites have been widely applied because of their high specific strength, high specific modulus, wear resistance, good conductivity and thermal stability, especially in the fields of aerospace, automobile industry and electronic instruments (Ref 1-3). Durai (Ref 4) has developed the A12O3/Al(Zn) with the reinforcement A12O3 particles and greatly improved the strength of the composite material by XD. Samaneh Mamnooni et al. (Ref 5) have successfully mixed Al with in situ synthesis of NiO by mechanical alloying (MA) method in a specified proportion. Morteza Shamanian (Ref 6) has produced Al-Al2O3-B4C composite by accumulative roll bonding (ARB) method. Some researchers also successfully prepared different aluminum matrix composites with outstanding performances by other techniques or reinforcement, such as the high-pressure torsion technique, microwave combustion, graphene and so on (Ref 7-9). However, the process of XD is long, complicated and uncontrollable. For MA, it is easy to bring in other elements in the process of ball milling, thereby affecting the properties of the material. Other technologies also have their shortcomings, such as low efficiency, high cost and unsuitability of mass production. The principle of MSR is to mix several salt-containing reinforcements and add them to the high-temperature matrix metal solution. Then, the metal Yongzhong Fu, Yuan Zhuang, Xiaojing Xu, Rikai Zhang, Peng Zhang, Hongbo Wei, Xiaopeng Jin, Zheng Liu, and Bin Zhang, Engineering Institute of Advanced Manufacturing and Modern Equipment Technology, Jiangsu University, Zhenjiang 212013, China; and Jing Wu and Xingbiao Sun, Naval Force 92721, Zhoushan 316100, China. Contact e-mail: [email protected].
Journal of Materials
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