Algorithm for the calculation of the coefficient of thermal expansion of multicomponent metallic alloys

An algorithm for the calculation of temperature dependent bulk properties of multicomponent systems is introduced and illustrated with the calculation of the coefficient of thermal expansion, equilibrium volume, energy of formation and compressibility of Ni-Ti-Nb shape memory alloys.     

Viewpoint on the Formation and Evolution of Annealing Twins During Thermomechanical Processing of FCC Metals and Alloys

Metallurgical and Materials Transactions A - The question of the formation mechanism of annealing twins in face-centered cubic metals and alloys, which is still not resolved in spite of the fact...     

Observations on the effect of a magnetic field on the annealing texture and microstructure evolution in zirconium

The effect of a magnetic field on the development of texture and microstructure in cold-rolled (80%) commercially pure zirconium (Zr701) was investigated. The specifically oriented sheet specimens were annealed at 550 °C for 15, 30 and 45 min and at 700 °C for 60, 90 and 180 min in a magnetic field of 19 T and 17 T, respectively. X-ray diffraction and electron backscatter diffraction measurements were used to characterize the crystallographic texture and the grain microstructure. The results revealed that the magnetic annealing promotes grain growth in the investigated material. This becomes apparent from the faster development of specific “grain growth” texture components and the bigger mean grain size after magnetic annealing. Magnetic annealing at 700 °C resulted in asymmetry of the two major texture components that constantly increased with annealing time. This effect is attributed to a magnetic driving force for grain growth arising from the anisotropic magnetic susceptibility of zirconium.     

Physical and chemical analyses on single source precursor growth CdSe semiconductor nanomaterials

CdSe nanocrystals (NCs) are synthesized by the single source precursor thermal method. The use of a temperature ramp allows to obtain faster elaboration and smaller nano-particles in size. A cross-disciplinary study between chemical analyses and physical techniques provides consistent data for these small size NCs. Joint mass spectroscopy, transmission electron microscopy and optical spectrometry techniques give a coherent picture about average size and size dispersion of the NCs, as well as their optical spectral response in correlation with their size via quantum confinement effects.