This work is focused on the role of intermetallics in pitting corrosion of Al2219 alloy. Second phase particles were characterized by AES, SAM and EDX. Their behaviour in a solution of NaCl was investigated as a function of exposure time. The results confirmed the cathodic nature of the intermetallics with respect to the aluminium matrix. Corrosion products rich in aluminium and oxygen were fou...

The microstructure, mechanical properties, and corrosion behavior of binary Ti-xPt alloys containing 5, 10, 15 and 20 wt% Pt were investigated in order to develop new Ti-based dental materials possessing superior properties than those of commercially pure titanium (cp-Ti). All of the Ti-xPt (x = 5, 10, 15, 20) alloys showed hexagonal α-Ti structure with cubic Ti₃Pt intermetallic phase. The mech...

Detailed density functional theory (DFT) calculations of the adsorption energies (Ead) for oxygen on monolayer Pd on top of the Pd-Cu face-centered cubic (FCC) alloy and intermetallic B2 structure revealed a linear correspondence between the adsorption energies and the d-band center position. The calculated barrier (Ebarrier) for oxygen dissociation depends linearly on the reaction energy diffe...

Lead-rich intermediate phases, in particular Pt,,Pb and PbO, are found to form on Pt(ll1) atop Ti-buffered Si substrates prior to formation of Pb(Zr, -*TiX)O3 (PZT) thin films. Pt,_,Pb is a [ill] textured transient intermetallic phase that nucleates PZT[111] texture. PbO is a [OOl] textured layer compound that nucleates PZT[100] texture. The formation conditions and lattice matching of these in...

Stress induced by ultrasonic dissipation during thermosonic ball bond formation is measured in-situ using microsensors integrated below test bonding pads. The devices are fabricated using a commercial CMOS process, exploiting p + diffusion as piezoresis-tive sensing material. We report time-dependent on-line measurements of the stress-induced resistance change. Higher harmonics of the microsens...

The activities of the group comprise the synthesis, characterization and reactivity studies of inorganic, organometallic and intermetallic compounds of actinides and lanthanides in order to understand the influence of the electronic configuration and of the size of these elements in the chemical behaviour of their compounds. Reactivity properties are assessed by stoichiometric reactions and by ...

The austenitic stainless steel was coated by dipping into a molten Al-12.4%Si alloy at 765oC. The effect of immersion times in the range of 60 to 900 s was investigated with respect to the phase nature, thickness, and microhardness. An uniform layer (~12 m) of Al12(Fe,Cr)3Si2 intermetallic with hexagonal crystalline structure is formed, irrespectively the immersion time. Microhardness of the c...