THE ROLE OF STRAIN IN THE NUCLEATION OF SOLID STATE TRANSFORMATIONS.

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Abstract:

The allotropic transformations in iron, cobalt, cerium, and lanthanum were studied with the objective of establishing the factors which are influential in the initiation and propagation of the transformation. From a study of zone-refined iron it was concluded that interstitial solutes are not essential for the martensitic transformation of iron. The FCC-HCP martensitic transformation was studied in whiskers, bulk single crystals and polycrystalline specimens of cobalt. From the measured effect of stress on the transformation it was concluded that the transformation was very defect sensitive and the habit plane was not controlled by a critical resolved shear stress criterion. In cerium, both the FCC-FCC and FCC-HCP transformations were studied in polycrystalline specimens. The FCC-HCP transformation in lanthanum was found to occur isothermally, in contrast to the other allotropic transformations studied in this work. Author

Author(s):
Wert, C. A. ; Altstetter, C. J. ; Nelson, J. O. ; Rashid, M. S.
Author Organization(s):
ILLINOIS UNIV URBANA
Descriptive Note:
Final rept. for 1 Jun 61-1 Sep 64,
Annotation:
The role of strain in the nucleation of solid state transformations.
Pagination:
0033

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
DA ARO D31 124G73
Project Number(s):
P3172MC
 Subject Terms
Communities of Interest:
Air Platforms
Descriptor(s):
*SOLID STATE PHYSICS, PHASE STUDIES, NUCLEATION, TRANSFORMATIONS, CRYSTAL LATTICES, CRYSTAL STRUCTURE, X RAY DIFFRACTION, COBALT, COBALT ALLOYS, LANTHANUM, CERIUM, MARTENSITE, IRON, IRON ALLOYS, CHROMIUM ALLOYS
Report Date:
1964 Oct 01