Structural phase transformations in metallic grain boundaries
نویسندگان
چکیده
منابع مشابه
Structural phase transformations in metallic grain boundaries.
Structural transformations at interfaces are of profound fundamental interest as complex examples of phase transitions in low-dimensional systems. Despite decades of extensive research, no compelling evidence exists for structural transformations in high-angle grain boundaries in elemental systems. Here we show that the critical impediment to observations of such phase transformations in atomis...
متن کاملSegregation and structural transformations at R = 3 grain boundaries in NiAl: A Monte-Carlo study
Grain boundary structure and grain boundary segregation in stoichiometric and Ni-rich compositions of NiAl are studied by molecular statics and grand-canonical Monte-Carlo simulations in conjunction with an embedded-atom potential. Significant Ni segregation is found at the R = 3(1 1 1) and R = 3(2 1 1) grain boundaries, with segregation isotherms showing a saturation effect. The amount of Ni s...
متن کاملEffect of interface phase transformations on diffusion and segregation in high-angle grain boundaries.
Recent experimental measurements of Ag impurity diffusion in the Σ5(310) grain boundary (GB) in Cu revealed an unusual non-Arrhenius behavior suggestive of a possible structural transformation Divinski et al., [Phys. Rev. B 85, 144104 (2012)]. On the other hand, atomistic computer simulations have recently discovered phase transformations in high-angle GBs in metals Frolov et al., [Nat. Commun....
متن کاملLW TEMPERATURE PHASE TRANSFORMATIONS IN WE METAlLIC PHASES OF METEORITES
The metallic phases of meteorites are predominantly composed of Fe with B to 50 wtR Mi. During slow cooling (10-1 to 103°C per million years) be low 500°C three types of phase transformations take place: 1) Fe—Mi mar tensite (m2) decomposition to c2(ferrite) and y(austenite); 2) Decomposition of austenite to a so—called “cloudy border” of a and ; and 3) Partial ordering of 48 to 55 wtR Mi auste...
متن کاملDiffuse interface model for structural transitions of grain boundaries
The conditions for structural transitions at the core of a grain boundary separating two crystals was investigated with a diffuse interface model that incorporates disorder and crystal orientation Kobayashi et al., Physica D 140, 141 2000 . The model predicts that limited structural disorder near the grain boundary core can be favorable below the melting point. This disordered material is a pre...
متن کاملذخیره 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: Nature Communications
سال: 2013
ISSN: 2041-1723
DOI: 10.1038/ncomms2919