SOLID SOLUTIONS AND SECOND PHASE STRENGTHENING OF NICKEL ALLOYS AT HIGH AND LOW TEMPERATURES

Five or six alloys each in the systems Ni-Cr, Ni-Mo, and Ni-W, spaced to cover the single phase areas as well as a part of the adjacent two-phase fields were prepared as vacuum-melted alloys. Tensile tests at room temperature and stress rupture tests at 1200 and 1500 F were run for time periods to give fracture in 0.1 to 500 hours. Observations were made of solid solution and second phase strengthening or weakening, coupled with studies of ductility and the role of structure on the noted behavior patterns. (auth)