AE characteristic of the damage behavior of TiNi/Al6061 SMA composite

TiNi/Al6061 shape memory alloy (SMA) composite was fabricated by a hot press method to investigate the microstructure and mechanical properties. Interface bonding between TiNi reinforcement and Al matrix was observed by using SEM and EDS. Pre-strain was imposed to generate compressive residual stress inside the composite. A tensile test for specimen which underwent pre-strain was performed at high temperature to evaluate the variation of strength and the effect of pre-strain. It was shown that interfacial reactions occurred at the bonding between matrix and fiber, creating two inter-metallic layers. The yield stress increased with the amount of pre-strain. The acoustic emission technique was used to nondestructively clarify the microscopic damage behavior at high temperature and the effect of pre-strain of TiNi/Al6061 SMA composite. In addition, a two-dimensional AE source location technique was applied to clarify the position of damage in composite.TiNi/Al6061 shape memory alloy (SMA) composite was fabricated by a hot press method to investigate the microstructure and mechanical properties. Interface bonding between TiNi reinforcement and Al matrix was observed by using SEM and EDS. Pre-strain was imposed to generate compressive residual stress inside the composite. A tensile test for specimen which underwent pre-strain was performed at high temperature to evaluate the variation of strength and the effect of pre-strain. It was shown that interfacial reactions occurred at the bonding between matrix and fiber, creating two inter-metallic layers. The yield stress increased with the amount of pre-strain. The acoustic emission technique was used to nondestructively clarify the microscopic damage behavior at high temperature and the effect of pre-strain of TiNi/Al6061 SMA composite. In addition, a two-dimensional AE source location technique was applied to clarify the position of damage in composite.