Based on the oxidation-free fluxless bonding technology, we have developed a bonding process to manufacture In–Au joints on copper substrates. 4 mm 4 mm Si blank dice and 6 mm 6 mm copper substrates are used. The dice are deposited with indium-rich Au/In/Cr multilayer structure in a single high vacuum cycle to prevent oxidation. Right after deposition, the outer Au layer interacts with the In l...

High energy ball milling of metallic powders leads to high reactivity in the milled mixture. The reaction is often faster and starts at a lower temperature. However, mechanisms responsible for this are not yet completely understood. aim study evaluate one possible activating factors heightened reactivity: nano-scale mixing reagents. Molecular dynamics was used analyze role an amorphous Ni–Al la...

Dissimilar friction stir spot welds (FSSW) between the magnesium and aluminum alloys are joined, using a novel approach called refill welding. The present work aims to evaluate macrostructural mechanical properties of welded AZ31B AA 6061-T6 in two combinations, i.e., identical Mg-to-Mg dissimilar Mg-to-Al joints, results compared with obtained conventional hardness profiles similar had appeara...

Electron spin resonance ~ESR! and magnetic-susceptibility experiments in the rare-earth-doped (R5Nd, Er, and Yb! cubic semiconducting YBiPt allow estimates of the fourth (A4) and sixth (A6) order crystal-field parameters for this compound. It is found that these parameters are of the same order for all the R studied. On the other hand, no crystal-field effects were found for the Gd doped single...

The dimeric Zintl ion [Hg(2)(As(7))(2)](4-) has been synthesized with high crystalline yield from the reaction of an ethylendiamine solution of the intermetallic Zintl phase K(3)As(7) with diphenyl mercury. Single crystal X-ray diffraction of [K(2,2,2-crypt)](4)[Hg(2)As(14)], 1 (2,2,2-crypt = 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]-hexacosane), reveals that the cluster anion exhibits a...