Accession Number:

AD0614149

Title:

NEUTRON DIFFRACTION STUDIES OF THE ORDER OF THE ATOMS IN THE P PHASE AND THE R PHASE,

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE

Report Date:

1964-01-06

Pagination or Media Count:

8.0

Abstract:

The ordering of the atoms in two ternary alloys, P phase Mo-Ni-Cr and R phase Mo-Fe-Mn, both structurally related to the sigma phase, has been studied by powder neutron diffraction. The at. Mo on each site was taken to be approximately that determined in previous X-ray single-crystal studies, which showed that Mo preferentially occupies CN16 and CN15 sites. From the best fit between observed and calculated neutron diffraction diagrams it is apparent that, in the P phase, Ni preferentially occupies CN12 positions. In the R phase, Mn shows only a slight preference for CN14 and CN15 positions over CN12 positions when competing with Fe. The results are consistent with those of ordering studies of related transition element intermetallic compounds. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE