Energy barriers and hysteresis in martensitic phase transformations

نویسندگان
چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Energy barriers and hysteresis in martensitic phase transformations

We report results from a systematic program of changing composition of alloys in the system TiNiX, X= Cu, Pt, Pd, Au, to pursue certain special lattice parameters that have been identified previously with low hysteresis. We achieve λ2 = 1, where λ2 is the middle eigenvalue of the transformation strain matrix, for alloys with X = Pt, Pd, Au. In all cases there is a sharp drop of the graph of hys...

متن کامل

Simple Model of Hysteresis in Thermoelastic Martensitic Transformations

To attain a better understanding of the hysteretic behaviour in shape memory alloys we present in this work a simple phenomenological model based on the thermoelastic balance that must be fulfilled at every step of transformation. The model is built on the simplest choice for the chemical and non-chemical free energies, that is, a first order dependence of these functions on T and x (transforme...

متن کامل

Dynamics of non-isothermal martensitic phase transitions and hysteresis

We consider a non-isothermal one-dimensional model of martensitic phase transitions that incorporates a finite bar with a non-monotone temperature-dependent stress–strain law and non-zero latent heat. Two dissipation mechanisms are considered: heat conduction and the internal viscous dissipation of kinetic origin. Time-dependent displacement and ambient temperature are prescribed at the ends of...

متن کامل

The e&ective energy and laminated microstructures in martensitic phase transformations

We study the behavior of crystals that undergo martensitic transformations. On cooling, the high-temperature phase (austenite) transforms to the martensite phase changing its crystalline symmetry. The lower crystalline symmetry of the martensite gives rise to several variants of martensite. Each variant has an associated transformation strain. These variants accommodate themselves (according to...

متن کامل

Temperature-controlled martensitic phase transformations in a model NiAl alloy

Reversible martensitic phase transformations in a partially disordered Ni–Al alloy within the composition range from 60 to 65 at. % of Ni are investigated using molecular dynamics simulation. During a complete temperature cycle a wide hysteresis in enthalpy, volume, and shape of the simulated crystals is observed. The temperature T0 of the phase transformation is found from the calculated free ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Acta Materialia

سال: 2009

ISSN: 1359-6454

DOI: 10.1016/j.actamat.2009.05.034