EVALUATION OF NANOSCALE MECHANICALLY-MILLED NIAL USING A MINIATURIZEDDISK-BEND TEST

This work reports on the characterization and mechanical properties of nanocrystalline NiAl materials using the Miniaturized Disk-Bend Test (MDBT). Nanoscale NiAl was synthesized by high energy milling of pre-a lloyed NiAl powder. Dense compacts were formed by forging the milled p owder at < 0.5 T-m in air. MDBT experiments were performed on 3 mm dia meter specimens using a ring-on-ring loading configuration. Bend stren gths of 136 to 495 MPa were recorded with limited ductility. The fract ure surfaces indicated that failure was along prior particle boundarie s from the milled powder, suggesting that the bend strength is control led by the strength at these interfaces.