1999 Volume 63 Issue 7 Pages 838-843
Mechanical properties were investigated in nickel/nickel alminide laminate materials with various volume fractions of NiAl. Laminate materials were made from the stacked Ni and Al sheets by hot pressing. The final volume fraction of NiAl in these materials were 0.70, 0.50 and 0.37 which were started from the initial thickness of Al sheets of 0.1, 0.05 and 0.025 mm, respectively. The maximum fracture resistance was 17.5 MPa\sqrtm in crack divider orientation and 23.5 MPa\sqrtm in crack arrester orientation. Higher fracture resistance in crack arrester direction was obtained because cracks were blunted and stopped at the ductile metal layer. An effective resistance curve in crack propagation was observed in the specimen with the volume fraction NiAl of 0.37. The relationship between fracture resistance and crack propagation behavior was explained by crack bridging model.
