Abstract: Auto body roof comprising at least one steel part and a skin part made of aluminum alloy that is attached to the steel part before painting. The aluminum part comprises a sheet of the following composition: Si: 0.7-1.3, Fe<0.5, Cu: 0.5-1.1, Mn: 0.4-1.0, Mg: 0.6-1.2, Zn<0.7, Cr 0.25, Zr+Ti 0.20, other elements <0.05 each and <0.15 total, and the remainder aluminum. The aluminum part, after solution treatment, quenching and age-hardening for three weeks at room temperature, possesses a yield strength R0.2 of less than 170 MPa, and preferably 160 MPa.

Abstract: Auto body roof comprising at least one steel part and a skin part made of an aluminum alloy that is attached to the steel part before painting. The aluminum part comprises a sheet of the following composition: Si: 0.7-1.3, Fe<0.5, Cu: 0.5-1.1, Mn: 0.4-1.0, Mg: 0.6-1.2, Zn<0.7, Cr<0.25, Zr+Ti<0.20, other elements <0.05 each and <0.15 total, and the remainder aluminium. The aluminum part, after solution treatment, quenching and age-hardening for three weeks at room temperature, possesses a yield strength R0.2 of less than 170 MPa, and preferably 160 MPa.

Abstract: An electronic device comprising at least one heat-generating electronic component and a passive electronic component in association with the heat generating component. The passive component comprises a porous preform of green silicon carbide or polygranular graphite, and a metal filling the porosities of the preform which can be aluminum, an aluminum alloy, magnesium or a magnesium alloy. The preform forms about 50 to 90% by volume of the passive component.

Abstract: The invention is directed to microcrystalline Al-based alloys produced by annealing an alloy formed initially in a substantially amorphous state by rapid solidification (about 10.sup.4 K/sec) and having a composition consisting essentially of, in atomic %:from 5 to 30% Sifrom 11 to 22% Niwherein the Ni may be partially substituted by Fe up to 10%, by V or B up to 5 atomic % each, or totally substituted by Mn up to 22 atomic %, and wherein Fe+Ni+Si.ltoreq.42%. In the microcrystalline state, in the vicinity of the first crystallization peak, there is a metastable hexagonal phase whose crystalline parameters are about a=0.661 nm and c=0.378 nm.