摘要
The compromise between strength and plasticity has greatly limited the potential application of particles reinforced magnesium matrix composites(MMCs).In this work,the Ti particles reinforced AZ31 magnesium(Mg)matrix composites achieved simultaneous improvement in strength,elongation and wear resistance.The Ti particles reinforced AZ31 composites were fabricated by ultrasonic-assisted stir casting with hot extrusion.The results showed that a strong interfacial bonding was obtained at Ti/Mg interface because of the formation of semicoherent orientation relationship of Ti Al/Mg,Ti Al/Al_(2)Ti and Al_(2)Ti/Mg interfaces.The as-extruded 6 wt.%Ti/AZ31 composite presented the best compressive mechanical properties and wear resistance with ultimate tensile strength,elongation and wear rate of 327 MPa,20.4%and 9.026×10^(-3)mm^(3)/m,obviously higher than those of AZ31 alloys.The enhanced mechanical properties were attributed to the grain refinement and strong interfacial bonding.The improved wear resistance was closely related to the increased hardness of composites and the formation of protective oxidation films.
基金
the financial supports from the Guangdong Major Project of Basic and Applied Basic Research(2020B0301030006)
the National Natural Science Foundation of China(Nos.52171103,52171133)
the Natural Science Foundation of Chongqing(cstc2019jcyjmsxm X0234)
the“111 Project”(B16007)by the Ministry of Education
the Fundamental Research Funds for the Central Universities(No.2020CDJDPT001)
Graduate Research and Innovation Foundation of Chongqing,China(No.CYB21001)。
