A polymorph of In2La was discovered by observing a change in the quadrupole interaction at nuclei of 111In/Cd probe atoms at high temperature using the technique of perturbed angular correlation of gamma rays. Point-symmetry information from the measured electric field gradient and chemical considerations suggests that the high-temperature polymorph has the hexagonal AlB2 structure. The transfo...

The powder synchrotron X-ray diffraction technique was used to study the thermal expansion behavior of the mixed valence layered compound, YbGa1.05Ge0.95 in the temperature range 3-1123 K. A surprising abrupt isosymmetric phase transition, accompanied by a dramatic volume increase (negative thermal expansion), was found at 5 K induced by a sudden Yb valence transition from +(2 + epsilon) toward...

We investigate the role metal vacancies play in phase stability and properties of Al1??B2 using first-principles calculations, alloy theory simulations, phonon experimental situ x-ray diffraction measurements thermal expansion. The relevant concentrations configurations are analyzed cluster expansion special quasirandom structure methods combined with vibrational free energy calculations within...

Grain refinement plays a central role in powder bed fusion (PBF) additive manufacturing by preventing hot cracking and thus enabling the development of high-strength alloys. However, mechanism behind grain is not fully understood for conventional casting, nor PBF. In this work, high throughput method have been used to produce Al-2 wt%Cu alloys with additions Ti1-xM(Zr,Ta,V,W)xB2, Al3Ti1-xM(Zr,V...