[Tensile deformation behaviour and mechanical properties in dental Ni-base casting alloys (author's transl)].

Tensile deformation behaviour and mechanical properties were studied in dental Ni-base casting alloys as 32 Ni-23 Cu-25 Mn(alloy 1) and 84 Ni-9 Cr systems (alloy 2). 1) Stress-strain curves of alloys 1 and 2 showed, respectively, a liner hardening-type and a type of a gradual increase in stress with tensile strain. 2) Specific deformation behaviours of alloys 1 and 2 with tensile strain, respectively, offered different values in mechanical properties; alloy 2 that showed larger elongation and strength than brittle alloy 1 indicated ductile characteristics of good elasticity and elastic regilience. 3) Fracture mechanism in alloys 1 and 2 was corresponding to intercrystalline crack i. e. brittle fracture and transgranular crack within cell structure i. e. ductile fracture, respectively.