Accelerated Diffusion and Phase Transformations in Co-Cu Alloys Driven by the Severe Plastic Deformation

作者：Straumal Boris B^*; Mazilkin Andrei A; Baretzky Brigitte; Schuetz Gisela; Rabkin Eugen; Valiev Ruslan Z

来源：Materials Transactions, 2012, 53(1): 63-71.

DOI：10.2320/matertrans.MD201111

• severe plastic deformation
• cobalt copper alloys
• phase transformations
• driven systems

The cast Co-5.6 mass% Cu and Co-13.6 mass% Cu alloys were subjected to severe plastic deformation (SPD) by the high-pressure torsion (HPT). The HPT treatment drastically decreases the size of the Co grains (from 20 mu m to 100 nm) and the Cu precipitates (from 2 mu m to 10 nm). The metastable fcc-Co disappeared, and supersaturated Co-based solid solution present in the as-cast alloys completely decomposed after HPT. Only the phases stable below 400 degrees C remained after severe plastic deformation (i.e. almost pure hcp-Co and fcc-Cu grains). The applicability of the concept of effective temperature originally developed for materials under irradiation for the SPD-accelerated diffusion is discussed. [doi:10.2320/matertrans.MD201111]

• 出版日期2012-1