Accession Number : AD0480038

Title :   EFFECTS OF SECOND-PHASE PARTICLES ON DUCTILITY.

Descriptive Note : Final rept. 6 Feb 64-30 Jun 65,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH

Personal Author(s) : Hahn, G. T. ; Rosenfield, A. R.

Report Date : JAN 1966

Pagination or Media Count : 77

Abstract : Several aspects of the effects of second-phase particles on ductility are discussed. In the case of crack initiation, particles can act to disperse the dislocation arrays which cause cracking, but also can initiate cracks which propagate into the matrix. It is suggested that there is a critical range of particle size and spacing at which the former beneficial effect predominates, and some experimental evidence to support this contention is cited. In the case of crack propagation, particles can act as dislocation sources. Calculations and experiments aimed at gaining insight into the effect of dislocation sources on yielding are described. Finally, auxiliary problems (such as effects of grain size and substructure on ductility, methods of producing dispersions, and properties of metals and interstitial compounds) are discussed. (Author)

Descriptors :   (*DUCTILITY, FRACTURE(MECHANICS)), PROPAGATION, STRESSES, ALLOYS, PARTICLES, HARDENING, DENSITY, STRAIN(MECHANICS), RECRYSTALLIZATION, METALS, GRAIN SIZE, REFRACTORY METALS, MOLYBDENUM, BRITTLENESS, CHROMIUM, TUNGSTEN, HEAT TREATMENT, PHYSICAL PROPERTIES, PARTICLE SIZE, IRON, TRANSITION TEMPERATURE, DEFORMATION, THEORY.

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE