Comparative Routes of Solid-Solution-Formation by MM of Ag-70Cu (at)

摘要

The solid-solution-formation (SSF) of Ag-70Cu (at%) has been chosen as the goal to be achieved by Mechanical Milling (MM) in a SPEX8000D-Mixer/mill and alternatively by a Simoloyer CM01-21. In case of the SPEX-Mixer/mill, this is reached after about 43.2 ks, in case of the Simoloyer after 18 ks. The observation, that processing at given parameters in the Simoloyer leads to a flaky geometry already after 0.060 ks versus the SPEX-Mixer/mill after 10.8 ks or not at all is concluded to be caused by a higher collision rate. In Esult this matches to the long known attempt, that the collision itself is the main event for energy transfer in MA. Additionally in case of the Simoloyer, Cycle Operation has been applied which results here in rapid flaking with quasi-disappearing ductility followed by shear-stress to break the flaky structure repeatedly. Since a higher collision rate versus shear and friction effect is expected to cause less abrasive wear on the milling tools, the Fe-contamination of both systems was investigated and showed a lower contamination for the Simoloyer which matches to the expectation, too. Material's characterization is given by SEM, XRD and TEM.