摘要
Mg−9Al−1Zn(AZ91)magnesium matrix composites reinforced by Ti−6Al−4V(TC4)particles were successfully prepared via powder metallurgical method.The yield strength(YS),ultimate tensile strength(UTS),and elongation(EL)showed a mountain-like tendency with the increase of the TC4 content.The mechanical properties of AZ91 magnesium matrix composites reached the optimal point with TC4 content of 10 wt.%,realizing YS,UTS,and EL of 335 MPa,370 MPa,and 6.4%,respectively.The improvement of mechanical properties can be attributed to the effective load transfer from the magnesium matrix to the TC4 particles,dislocations associated with the difference in the coefficient of thermal expansion,good interfacial bonding between the Mg matrix and TC4 particles,and grain refinement strengthening.
采用粉末冶金法制备Ti−6Al−4V(TC4)颗粒增强Mg−9Al−1Zn(AZ91)镁基复合材料。随着TC4含量的增加,复合材料的屈服强度、极限抗拉强度和伸长率先升高后降低。当TC4颗粒的含量达到10%(质量分数)时,复合材料具有优异的综合力学性能,其屈服强度、抗拉强度和伸长率分别为335 MPa、370 MPa和6.4%。综合力学性能的改善是由于镁基体和TC4颗粒之间具有良好的界面结合,载荷可从镁基体转移到TC4颗粒上,其强化机制主要包括热膨胀系数差异引起的位错强化及细晶强化。
基金
Acknowledgments The authors acknowledge the financial support from the Guangdong Major Project of Basic and Applied Basic Research,China(No.2020B0301030006)
the National Natural Science Foundation of China(Nos.52171133,52171103)
the“111 Project”by the Ministry of Education of China(No.B16007)
Fundamental Research Fund of Central Universities in China(No.2018CDJDCL0019)。
