The Effect of Reciprocating Extrusion (Cec) on the Consolidated Silver Powders Microstructure / Wpływ Dwustronnego Wyciskania (Cws) Na Mikrostrukture Konsolidowanych Proszków Srebra

Abstract

The microstructure and properties investigations silver powders consolidated by cyclic extrusion compression (CEC) were performed. The AgSnBi and AgNi powders using for electrical contacts were investigated. The observation by using optical microscopy (MO) and transmission electron microscopy (TEM) were apply. The strong diminishing of microstructure inside the consolidated granules were found. This phenomenon cause microhardness increase, restricted by material porosity.Keywords: Reciprocating Extrusion (CEC), SPD consolidation, Ag powders W pracy przedstawiono badania mikrostruktury i własności proszków srebra konsolidowanych metodą cyklicznego wyciskania ściskającego -CWS. Badania objęły proszki AgSnBi oraz AgNi stosowane na styki elektryczne. Przeprowadzono obserwacje przy użyciu mikroskopu optycznego (MO) oraz transmisyjnego mikroskopu elektronowego (TEM). Stwierdzono silne rozdrobnienie mikrostruktury wewnątrz konsolidowanych granul proszków. Spowodowało to wzrost mikrotwardości, ograniczony porowatością materiału.

Bulk Nanomaterials and Powders Consolidation Produced by Cyclic Extrusion Compression

“…The optical micrographs show that after the cyclic extrusion compression deformation the AgSn7.5Bi0.4 powder has been consolidated into the bulk material just after the few first cyclic extrusion compression cycles [13]. The TEM investigations of AgSn7.5Bi0.4 revealed presence of nanometer-sized subgrains/grains and nanometric thickness bands within the structure of consolidated powder (Fig.…”

Using the Radial Shear Rolling Method for Fast and Deep Processing Technology of a Steel Ingot Cast Structure

“…Higheffective microstructure processing methods such as high-pressure torsion (HPT) [47][48][49] are unfortunately not applicable outside laboratories, and even more so for ingots, not applicable due to sample size limitations and method scaling factors. The same can be said for cyclic extrusion (CEC) [50,51], accumulated roll bonding (ARB) [52], and some other methods [53][54][55][56][57][58][59]. Of course, ECAP can be used for pressing ingots, but this is not technologically easy due to the need for several pressing cycles and considerable effort and equipment strength requirements.…”