Formation of bulk metallic glass in quaternary Ti-Zr-Cu-Ni alloys by relatively slow cooling from the melt is reported. Thick strips of metallic glass were obtained by the method of metal mold casting. The glass forming ability of the quaternary alloys exceeds that of binary or ternary alloys containing the same elements due to the complexity of the system. The best glass forming alloys such as...

Adsorption of transition atoms on a (8,0) zigzag single-walled boron nitride (BN) nanotube has been investigated using density-functional theory methods. Main focuses have been placed on configurations corresponding to the located minima of the adsorbates, the corresponding binding energies, and the modified electronic properties of the BN nanotubes due to the adsorbates. We have systemically s...

G. W. Lee,1,2 A. K. Gangopadhyay,1 R. W. Hyers,3 T. J. Rathz,4 J. R. Rogers,5 D. S. Robinson,6 A. I. Goldman,6 and K. F. Kelton1 1Department of Physics, Washington University, St. Louis, Missouri 63130, USA 2Korea Research Institute of Standards and Science, Daejon, Choongnam 305-340, Republic of Korea 3University of Massachusetts, Amherst, Massachusetts 01003, USA 4University of Alabama, Hunts...

MAX phases are nanolaminated ternary materials that combine metallic and ceramic properties. Currently, the A-site elements replacement in traditional ones by later transition-metals opens a door to explore new types of phases. In this work, we performed systematic first-principle study trends stability, electronic structure elastic properties 288 compositions M2AX (M=Ti, V, Cr, Zr, Nb, Mo, Hf,...

Pd+Zr and Pd+Hf co-doped aluminide coatings were deposited on the Mar-M247 nickel superalloy by palladium electroplating followed zirconizing-aluminizing or hafnizing-aluminizing processes. Both consisted of two zones, outer interdiffusion one build ?-(Ni,Pd)Al phase. Hafnium zirconium formed inclusions that precipitated at border zones close to surface (only in Zr+Pd modified coating). Oxidati...

We report the discovery of structural phase transitions and superconductivity in full Heusler compounds $X{\mathrm{Pd}}_{2}\mathrm{Sn}$ ($X=\text{Ti}$, Zr, Hf), by means electrical transport, magnetic susceptibility, specific heat, x-ray diffraction measurements. $\mathrm{Ti}{\mathrm{Pd}}_{2}\mathrm{Sn}$, $\mathrm{Zr}{\mathrm{Pd}}_{2}\mathrm{Sn}$, $\mathrm{Hf}{\mathrm{Pd}}_{2}\mathrm{Sn}$ under...

industries, its nuclear properties in the pure metallic form make it highly desirable for nuclear applications. Zr is highly corrosion resistant and has a high melting point (2128 K) with a low thermal neutron absorption cross-section of Zr T = 0.18 b, which is significantly smaller than that of hafnium Hf T =115 b) (Speer, 1982), an element that coexists with Zr in nature. This makes Zr ideal ...

Ni-implantation has been conducted for sputter deposited Zr alloy films to investigate compositional dependent amorphization behavior in proportion to Ni in Zr alloys. As-deposited Zr and Zr–Cu with thickness of 200 nm shows columnar hcp-Zr and nano-crystalline hcp-Zr(Cu), respectively. Implantation of 150 keV Niþ with the amount of 1 10 ions/cm induces amorphization of Zr and Zr(Cu) with 100 n...

Calcium-rich-Aluminum-rich refractory inclusions are considered to be the first objects yet identified that formed in the solar system. It is now established that most (but not all) of them contain nucleosynthetic anomalies from e-, p-, r-, and/or s-processes. Exactly how and when these heterogeneities in the dust that formed the solar system were established is not yet clear. For a better unde...