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 β → γ transformation in dicalcium silicate has been studied by a combination of optical microscopy and transmission electron microscopy (TEM). The γ-phase forms as long needles or laths whose long axis is parallel to [001] γ. These tend to occur in bundles. TEM shows that regions of γ in partially transformed specimens are not internally twinned but contain a high density of dislocations and of low angle grain boundaries running parallel to the long axis of the particles. γ particles can be induced to form by the stress near a microhardness indentation. The nature of the β → γ transformation and the effect of the very large dilatation (14%) which accompanies the transformation are discussed. The α′ ⇄ β transformation has been studied on a TEM hot stage. It is confirmed that (100) β twins are formed on cooling through the α′ → β transformation temperature. Local stresses set up at the intersection of twin lamellae with domain boundaries are relaxed by slip on (100).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00542054
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