Abstract
Nanometre-sized !′-martensites (bcc, denoted by α), a few nanometres in cross-sectional diameter, formed at intersections of deformation twins, have been found in a heavily deformed 316-type austenitic stainless steel (fcc, denoted by γ) and examined by high-resolution transmission electron microscopy (HRTEM). An orientation relationship was found to be close to the Kurdjumov-Sachs relationship, that is (111)γ//(101)α, [10amp;1macr;]γ//[11amp;1macr;]α. HRTEM observations were conducted with a beam direction parallel to [10amp;1macr;]γ//[11amp;1macr;]α. The observed nanometre-sized !'-martensites exhibited a (2amp;5macr;2)γ habit plane and the (10amp;1macr;)γ//(11amp;1macr;)α cross-section of the nanometre-sized !'-martensites were elongated along [545]γ. It has been revealed that the nanometre-sized !'-martensites of a few nanometres diameter formed at the intersections of deformation twins have a typical habit plane of (2amp;5macr;2)γ, which is identical with that reported for a fully grown plate such as !'-martensite. The origin of the observed habit plane is discussed on the basis of the ⟨112⟩{111}γ shear displacements assisting the γ → α′ transformation.
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