THE CRYSTALLOGRAPHY OF THE $beta$$-$$alpha$ TRANSFROMATION IN ZIRCONIUM AND IN TWO TITANIUM-MOLYBDENUM ALLOYS

Journal Article · Sat Aug 01 04:00:00 EDT 1959 · Acta Met.

DOI:https://doi.org/10.1016/0001-6160(59)90189-0· OSTI ID:4198897

Gaunt, P; Christian, J W

The habit planes and orientation relationships associaied with the transformation were studied in two specimens of crystal bar zirconium. The results are very similar to those of earlier workers for titanium, but the habit planes lie a little nearer to the (001) to (111) boundary and the (1120) alpha pole is displaced a little further from (111) towards (110) than in titanium. The results are compared with the predictions of the Bowles-Mnckenzie theory; as with titanium, best agreement is obtained with a tane A ( alpha /sup +/, omega / sup +/) solution, but in the present work it is not possible to obtain exact agreement for both orientations and habit planes. X-ray and kinetic observations both show that deformation accompanying transformaiion is much more severe in zirconium than in titanium, possibly as a result of a larger volume change, and the discrepancies may be due to the accommodation stresses. The habit planes and shape deformations were determined for stressinchced martensite in quenched titanium alloys containing 11% and 12.5% molybdenum. In the 12.5% alloy, o~y (344) type martensite was produced by stress, but both (334) and (344) twpes were produced in ihe other alloy, with the (334) predominating. The observed shear directions for the (334) martensite agreed with the predictions of the type A ( alpha /sup +/, omega /sup +/solution. A tentative>s orientation relation was obtained for one plate of (344) martensite; the present theory of this type of transformation is briefly discussed. (auth)

• Research Organization: The University, Sheffield, Eng.; University Museum, Oxford
• NSA Number: NSA-14-000637
• OSTI ID: 4198897
• Journal Information: Acta Met., Journal Name: Acta Met. Vol. Vol: 7
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALLOTROPY
CRYSTALS
DEFORMATION
GRAIN BOUNDARIES
HEAT TREATMENTS
MARTENSITE
METALS, CERAMICS, AND MATERIALS
MOLYBDENUM ALLOYS
PHASE DIAGRAMS
PLATES
REACTION KINETICS
SHEAR
STRESSES
SURFACES
TENSILE PROPERTIES
TITANIUM
TITANIUM ALLOYS
VARIATIONS
VOLUME
X RADIATION
ZIRCONIUM