Accession Number : AD0432420


Title :   DISPERSION STRENGTHENED NICKEL-BASE ALLOYS.


Descriptive Note : Final rept., 1 Mar-31 Dec 63,


Corporate Author : NEW ENGLAND MATERIALS LAB INC MEDFORD MASS


Personal Author(s) : Bufferd,A S ; Nelson,R C ; Grant,N J


Report Date : 24 Feb 1964


Pagination or Media Count : 24


Abstract : The dispersion strengthening of 80 Nickel-20 Chromium and Udimet 500 Modified compositions was investigated with thorium oxide introduced by mechanical mixing or thermal decomposition techniques. Thermal decomposition of thorium nitrate onto 80 Nickel-20 Chromium powder produced a better degree of thorium oxide dispersion than mechanical mixing. The 100 hour rupture life stress of 80 Nickel-20 Chromium at 1800 F was increased from 1600 to 3400 psi with the addition of 5 vol.-% thorium oxide. In addition, the effect of further cold deformation after extrusion on properties was investigated with 2.5 and 5 vol.-% thorium oxide dispersions in 80 Nickel-20 Chromium. (Author)


Descriptors :   *NICKEL ALLOYS , DISPERSION HARDENING , CHROMIUM ALLOYS , COBALT ALLOYS , POWDER ALLOYS , POWDER METALLURGY , POWDER METALS , EXTRUSION , PARTICLE SIZE , HIGH TEMPERATURE , SCIENTIFIC RESEARCH , RUPTURE , X RAY PHOTOGRAPHY , COLD WORKING , MICROSTRUCTURE , OXIDES , NITRATES , PYROLYSIS , HARDNESS


Distribution Statement : APPROVED FOR PUBLIC RELEASE