NON DESTRUCTIVE TESTING FOR Ni-Ti SAMPLES PREPARED BY DIFFERENT TECHNIQES

Abstract

Long series of searches were applied to emphasize Ni-Ti alloy composition harmony within human body. Ni-Ti alloy chemical and mechanical testing results paved for a revolution in the field of medical implants. Despite the fact that Ni-Ti alloy has simple composition, fabrication of implants remains a great deal of concern. Medical implants should be tested to assure that there are no defects or imperfections included, and so no harmful effects could take place. In this study different Ni-Ti alloy composition samples have been fabricated using three different techniques. These techniques are sand casting, powder – sand casting method and sintering method. Non destructive techniques were used to test samples structure and their surface and subsurface defects. Die penetrant test were applied to all samples then inspected with electromagnetic method and finally samples were inspected using ultrasonic waves. It was found that samples prepared using sand casting showed the best results and so sand casting is highly recommended to fabricate Ni-Ti ally implants.