Coarsening of Mo grains in the molten Ni-Fe matrix of a low volume fraction

Journal Article · Fri Feb 01 04:00:00 EST 1985 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(85)90146-4· OSTI ID:5975127

Kim, S S; Yoon, D N

The growth pattern of close-packed grains in a 96Mo-3.5Ni-0.5Fe (by wt%) alloy at the liquid-phase sintering temperature of 1430/sup 0/C has been investigated via etch boundaries formed i the grains during a cyclic heat-treatment. The observed growth pattern is highly asymmetrical as a result of strong interaction between the neighbouring grains in contact. But the net growth rate of each grain appears to increase with its size. The flatness of the liquid film boundaries and their small thickness relative to the cross-sections of bulk liquid at the grain edges and corners indicate that the grain growth is limited by the migration of liquid pockets at the four grain corners, which occurs by solution and reprecipitation between the grain surfaces surrounding them. Based on these observations, it is proposed that the average grain growth can be still described by Ostwald ripening theories. The observed growth patterns of the grains do not show any evidence for the coalescence mechanism.

• Research Organization: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Cheongryang, Seoul
• OSTI ID: 5975127
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 33:2; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CALCULATION METHODS
CRYSTAL STRUCTURE
ETCHING
EVEN-EVEN NUCLEI
FABRICATION
GRAIN DENSITY
GRAIN GROWTH
GRAIN REFINEMENT
HEAT TREATMENTS
INTERMEDIATE MASS NUCLEI
IRON ADDITIONS
IRON ALLOYS
ISOTOPES
MICROSTRUCTURE
MOLYBDENUM 96
MOLYBDENUM ALLOYS
MOLYBDENUM BASE ALLOYS
MOLYBDENUM ISOTOPES
NICKEL ALLOYS
NUCLEI
SINTERING
STABLE ISOTOPES
SURFACE FINISHING
VERY HIGH TEMPERATURE