DIFFUSIONLESS PHASE TRANSFORMATIONS IN ZIRCONIA AND HAFNIA

Journal Article · Sun Sep 01 04:00:00 EDT 1963 · Journal of the American Ceramic Society (U.S.)

DOI:https://doi.org/10.1111/j.1151-2916.1963.tb11768.x· OSTI ID:4641145

Wolten, G M

A study, by high-temperature diffractometry, of the monoclinic- tetragonal phase changes in pure ZrO/sub 2/ and HfO/sub 2/ disclosed that the hysteresis loops associated with the transformations have similar shapes that are typical of mamy martensitic phase changes, but that the widths of the loops differ greatly for the two materials, being about 200 deg C for zirconia amd only 20 to 30 deg C for hafnia. The temperature-induced transformations are predominantly athermal. The nature of these and similar transformations is discussed. The reversible formation of a cubic form of ZrO/sub 2/ above 2200 deg C was confirmed. (auth)

• Research Organization: Aerospace Corp., El Segundo, Calif.
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-039559
• OSTI ID: 4641145
• Journal Information: Journal of the American Ceramic Society (U.S.), Journal Name: Journal of the American Ceramic Society (U.S.) Vol. Vol: 46; ISSN JACTA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALLOTROPY
DIFFRACTION
HAFNIUM OXIDES
HIGH TEMPERATURE
HYSTERESIS
LATTICES
MARTENSITE
METALS, CERAMICS, AND OTHER MATERIALS
TEMPERATURE
ZIRCONIUM OXIDES