Effective elastic moduli of in-situ A356/TiB2 composites
(1.State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030, China2.State Key Lab of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030, China3.School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China)
Abstract: The effective elastic moduli （EEM） of A356/TiB2 composites formed by gravity casting and adjusted pressure casting （APC） were measured and compared. The results show that the EEM of A356/TiB2 composites are improved obviously by TiB2 particles and affected by forming methods. The EEM of the specimens formed by APC are higher than those in the gravity casting case. For 9.5%A356/TiB2（volume fraction）, the EEM of the specimens formed by APC reaches 93GPa, which is 9GPa higher than those in the gravity casting case. An analytic model is established to explain the mechanics of the EEM of composites reinforced with TiB2 particles.
Key words: in situ composites； A356/TiB2 composite； effective elastic moduli(EEM)； adjusted pressure casting