Sb interactions with TaC precipitates and Cu in ion-implanted. cap alpha. -Fe

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5186575

Follstaedt, D. M.; Myers, S. M.

The interactions of Sb with the other species implanted into Fe to form Fe-Ta-C-Sb and Fe-Cu-Sb alloys have been examined with transmission electron microscopy and Rutherford backscattering following annealing at 873/sup 0/K. Trapping of Sb at TaC precipitates is observed in the former alloy just as was previously observed in Fe-Ti-C-Sb. In Fe-Cu-Sb, Sb interactions are governed by the atomic ratio of Sb to Cu. For ratios between 0.2 to 0.4, the compound ..beta..-Cu/sub 3/Sb was observed to form. For Sb to Cu ratios approx.< 0.1, fcc Cu precipitates were observed. In addition to the expected Sb dissolution in Cu, Sb trapping by Cu precipitates is also observed. The binding enthalpy of Sb at both TaC and Cu precipitates with respect to a solution site in the bcc Fe is the same as observed for TiC, approx. 0.4 eV. The constancy of the binding enthalpy at such chemically dissimilar precipitates supports the hypothesis that the trapping is due to the structural discontinuity of the precipitate-host interface. The observed Sb trapping at precipitates is of potential significance for the control of temper embrittlement in bcc steels.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5186575
• Report Number(s): SAND-80-0779C; CONF-800744-3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals &amp; Alloys-- Mechanical Properties
ALLOYS
ANTIMONY
ANTIMONY ALLOYS
CARBIDES
CARBON ADDITIONS
CARBON COMPOUNDS
COPPER
COPPER ALLOYS
DISSOLUTION
ELEMENTS
EMBRITTLEMENT
ENTHALPY
IRON ALLOYS
METALS
PHYSICAL PROPERTIES
PNICTIDES
PRECIPITATION
SEPARATION PROCESSES
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TANTALUM ALLOYS
TANTALUM CARBIDES
TANTALUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRAPPING