The heat treatments have been designed to vary the matrix microstructure in P/M processed SiC reinforced 7xxx Aluminum alloys to determine the effects of matrix microstructure, interface behavior on the mechanical properties. Smooth tensile, notched bend tests were performed. The results conclude that the clustered regions have been observed as preferred initiation sites in both tensile and not...

The in situ SiC/Al composites were fabricated in Al-Si-C systems with different Si/C mass ratios and holding time by the method of combustion synthesis and hot press consolidation. The influences of Si/C mass ratio and holding time on the phase constitution, microstructure, and hardness of the composites were investigated. The results indicate that the increase of Si/C mass ratio leads to more ...

Por phyry de pos its in Brit ish Co lum bia have pro duced more than $27 bil lion worth of cop per and gold. They formed dur ing two dis tinct pe ri ods in the de vel op ment of the Cor dil lera: the first in the Late Tri as sic to Early Ju ras sic and the sec ond in the Cre ta ceous to Eocene. Most por phyry pro duc tion has come from the south ern part of Quesnel Terrane, where two cy cles of...

The results of studies on the development technological methods for formation low-resistivity contact systems to n- and p-SiC based single multilayer Ni-, Al- Ti-compositions 4H-SiC bipolar devices are presented. It is shown that contacts Ni n-4H-SiC (rho c =3.6·10 -4 Ohm·cm 2 ) Ni/Al p-4H-SiC =5.9·10 -5 possible within a cycle vacuum annealing at 1000 o C 120 s. This solution makes it reduce n...