Evidence of recrystallization mechanism of grain refinement in hypercooled Co80Pd20 alloys

• Published in: Materials letters Vol. 81; pp. 73 - 75
• Main Authors: Xu, X.L., Chen, Y.Z., Liu, F.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.08.2012
• Subjects: Alloys; Boundaries; cobalt; cooling; crystallization; Defects; Grain boundaries; Grain refinement; Metals and alloys; Microstructure; palladium; Quenching (cooling); Recrystallization; Solidification; Substructures; Metals and alloys; Microstructure; Recrystallization; Solidification; Defects
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2012.04.042

Applying fluxing method, hypercooling was achieved in Co80Pd20 alloys. The microstructures and substructures of the as-solidified hypercooled Co80Pd20 alloys subjected to rapid quenching and natural cooling were investigated. Compared to the naturally cooled specimens showing typical microstructural characteristics of recrystallization, high densities of low-angle grain boundaries, dislocations and stacking faults were observed in the quenched specimens. These sub-structures suggest a partial recrystallization occurring in the quenched specimens and are believed as the evidence of recrystallization mechanism of grain refinement in hypercooled Co80Pd20 alloys. The relatively defect-free structure and the high-angle boundaries suggest a relatively sufficient recrystallization in the naturally cooled alloys. ► Co80Pd20 alloy was hypercooled by fluxing method. ► The substructure of the hypercooled Co80Pd20 alloys with rapid quenching was studied. ► Many low-angle grain boundaries and dislocations suggest partial recrystallization. ► The high-angle boundaries suggest a sufficient recrystallization in the alloys.