ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The tetragonal-to-monoclinic (T → M) phase transformation accompanied with thermal cycling has been studied by ionic conductivity, dilatation and X-ray diffraction measurements. With repeating thermal cycling, theM s point shifts to a higher temperature, the amount of expansion due to T → M transformation increases, and the transformation proceeds from the surface in the specimen interiors. These phenomena are attributed to grain boundary cracking which occurs as a result of the transformation. The time-transformation isotherms at 353 K and at room temperature can be expressed by the Johnson-Mehl equationf=1−exp(−bt n ), and the samen value of 0.7 was obtained irrespective of grain size and of environment.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02403953
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