Undercooled and rapidly quenched Ni-Mo alloys

Conference · Wed Jan 01 00:00:00 EST 1986

OSTI ID:5634041

Tewari, S N; Glasgow, T K

Hypoeutectic, eutectic, and hypereutectic nickel-molybdenum alloys were rapidly solidified by both bulk undercooling and melt spinning techniques. Alloys were undercooled in both electromagnetic levitation and differential thermal analysis equipment. The rate of recalescence depended upon the degree of initial undercooling and the nature (faceted or nonfaceted) of the primary nucleating phase. Alloy melts were observed to undercool more in the presence of primary Beta (NiMo intermetallic) phase than in gamma (fcc solid solution) phase. Melt spinning resulted in an extension of molybdenum solid solubility in gamma nickel, from 28 to 37.5 at % Mo. Although the microstructures observed by undercooling and melt spinning were similar the microsegregation pattern across the gamma dendries was different. The range of microstructures evolved was analyzed in terms of the nature of the primary phase to nucleate, its subsequent dendritic growth, coarsening and fragmentation, and final solidification of interfenderitic liquid.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 5634041
• Report Number(s): N-86-21659; NASA-TM-87257; E-2947; CONF-860340-6; TRN: 86-022410
• Resource Relation: Conference: 115. American Institute of Mining, Metallurgical and Petroleum Engineers annual meeting, New Orleans, LA, USA, 2 Mar 1986
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MOLYBDENUM ALLOYS
EUTECTICS
MICROSTRUCTURE
NICKEL ALLOYS
EXPERIMENTAL DATA
INTERMETALLIC COMPOUNDS
LEVITATION
NUCLEATION
QUENCHING
SOLID SOLUTIONS
THERMAL ANALYSIS
ALLOYS
CRYSTAL STRUCTURE
DATA
DISPERSIONS
INFORMATION
MIXTURES
NUMERICAL DATA
SOLUTIONS
360102* - Metals & Alloys- Structure & Phase Studies