Transformation superplasticity of laminated CuAl10Fe3Mn2 bronze-intermetallics composites

Autor: M. Konieczny
Rok vydání: 2020
Předmět:
Zdroj: AIMS Materials Science. 7:312-322
ISSN: 2372-0484
Popis: The tensile properties at elevated temperatures (780, 800 and 820 ℃) for the laminated CuAl10Fe3Mn2-intermetallics composites have been investigated. The bronze-intermetallics laminated composites were transformation superplastic at 800 ℃. When the initial strain-rate was 0.7 × 10-3 s-1 fracture elongation of 455% was achieved. An excursion through the transformation range α→β and back β→α resulted in a finite, irreversible strain increment on each thermal cycle. These strains were accumulated without fracture of intermetallic layers. A small amount of cavities were formed during superplastic deformation of aluminum bronze which were nucleated at the iron-rich particles and grew along the force axis. At 780 and 820 ℃, the expected superplastic behavior of laminated composites was not realized because α and β phase grains were too coarse to allow deformation by grain-boundary sliding through microstructural superplasticity and cracking in the intermetallic layers began.
Databáze: OpenAIRE
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