Change in direction of carbon thermotransport in Nb-V system with alloying

Journal Article · Wed Jun 01 00:00:00 EDT 1988 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02674017· OSTI ID:6663771

Uz, M; Carlson, O N

Thermotransport of carbon in a complete series of Nb-V alloys was studied using a radioactive tracing technique. The heat of transport Q of carbon in Nb and V is negative; i.e. thermotransport is toward the hotter regions. Marked changes in the value of Q result from alloying of the two metals, however, and an unusual reversal in its sign, i.e., a reversal in thermotransport direction, occurs at -- 1.5 at. pct V on the Nb-rich end, and again at -- 25 at. pct Nb on the V-rich end of the system. It increases rather sharply from - 54.8 kJ/mol in pure niobium to + 7.6 kJ/mol at 2.5 at. pct V, and reaches a maximum of + 43.6 kM/mol at approximately 25 at. pct V. Further increase in the V content results in a more gradual decrease in Q to its value of - 42.3 kJ/mol in pure vanadium. Possible explanations of these results based on current theories of thermotransport are presented, and the implications from an engineering standpoint are examined.

• Research Organization: Ames Lab., Iowa State Univ., Ames, IA (US)
• OSTI ID: 6663771
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 19A:6; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
ATOM TRANSPORT
BINARY ALLOY SYSTEMS
CARBON
DATA
DIFFUSION
ELEMENTS
ENGINEERING
HEAT FLOW
INFORMATION
ISOTOPE APPLICATIONS
NEUTRAL-PARTICLE TRANSPORT
NIOBIUM ALLOYS
NONMETALS
NUMERICAL DATA
RADIATION TRANSPORT
THEORETICAL DATA
THERMAL DIFFUSION
THERMODYNAMICS
TRACER TECHNIQUES
VANADIUM ALLOYS