The plastic deformation and fracture characteristics of two gold-platinum alloys strengthened by spinodal decomposition have been experimentally investigated. It was found that the fracture path in these alloys is primarily intergranular; this is caused by incoherent grain, boundary precipitation of the equilibrium phases. The grains themselves are not embrittled by the transformation. It was also found that the initial work-hardening rate is higher than normally observed, and that the proportional limit is appreciably increased by spinodal decomposition. A new theory was advanced to account for the work-hardening behavior, and it is in good agreement with experimental results. It was also shown that present theories cannot account for the large increase in proportional limit.
ASJC Scopus subject areas
- General Engineering