Tribotechnical properties modification of Al-Sn alloys by ECAP
The influence of ECAP on tribotechnical properties of Al-Sn alloys was investigated. It was established that their wear rate under dry friction on steel is reduced up to 18 ± 2% after pointed treatment while the friction coefficient does not depend on the ECAP numbers.
Microstructural and mechanical behavior of highly deformed Al–Sn alloys
Abstract Tensile strength and microstructural evolution were evaluated for the deformation processed metal–metal composites of Al–X vol.% Sn, where X = 3.96, 16.32, 20. Samples were prepared by casting, and deformed by cold rolling. The material was characterized by scanning electron microscopy and focused ion beam. In the case of larger true strains η > 5, the composite presents an unexpected increase in tensile strength compared to the rule of mixtures. During cold rolling, the Sn phase developed a lamellar morphology and geometrical aspects, as its separation and thickness were correlated with the tensile strength of the composite. A study of the peak broadening was made by using X-ray diffraction, in order to measure the microstrains inside the composite, and correlate them with the macroscopic strength.
DEFORMATION PROCESSED Cu-REFRACTORY METAL COMPOSITES
ABSTRACT Recent studies have shown that heavily drawn Cu-Nb alloys can achieve strengths above 2000 MPa and outstanding combinations of strength plus conductivity (both electrical and thermal). The properties result from an aligned composite structure formed by a mechanical reduction which produces ribbon shaped Nb filaments In the Cu matrix. These metal-metal matrix composites are referred to here as deformation processed composites (DPC). A whole series of metal-metal matrix Cu-X alloys may be prepared by deformation processing, where X may be any of the BCC metals: V, Nb, Ta, Cr, Mo, W or Fe. Processing consists of two primary steps: preparation of the Cu-X billet with the X phase uniformly dispersed as small particles, and then a very large mechanical reduction. The billet may be prepared by either solidification or powder processing. Existing experimental results are reviewed, some new data on powder processed Cu-W are presented, and the general applicability of solidification processed and powder pr...