Elastic and plastic aspects of martensitic transformations

Magnetic Aspects of Martensitic Transformations in FeNi Alloys

Feloo-xNi, alloys for x<34 at% i.e., up to the structurally stable Invar concentration, undergo a martensitic transformation. In the parent fcc-phase these alloys show a volume enhancement which is known as the anti-Invar effect. This effect disappears at a concentration at which the martensitic transformation also no longer takes place. In a narrow concentration range of about 301x<34 at% Inva...

Martensitic Transformation and Elastic Constants

Aspects of the Phenomenological Theory of Elastic-Plastic Deformation

Several issues pertaining to the phenomenological description of rate-independent plasticity in crystalline solids are discussed. These include energy dissipation, the specification of initial plastic deformation, material symmetry and the modeling of scale-dependent response.

Elastic, Plastic, Cracking Aspects of the Hardness of Materials

The hardness properties of materials are tracked from early history until the present time. Emphasis is placed on the hardness test being a useful probe for determining the local elastic, plastic and cracking properties of single crystal, polycrystalline, polyphase or amorphous materials. Beginning from connection made between individual hardness pressure measurements and the conventional stres...

Symmetry and reversibility of martensitic transformations

Martensitic transformations are diffusionless solid-to-solid phase transformations characterized by a rapid change of crystal structure, observed in metals, alloys, ceramics, and proteins. They come in two widely different classes. In steels, the transformation microstructure induced by quenching remains essentially unchanged upon subsequent loading or heating; the transformation is not reversi...