Transformation superplasticity of laminated CuAl10Fe3Mn2 bronze-intermetallics composites

Marek Konieczny; Marek Konieczny

doi:10.3934/matersci.2020.3.312

AIMS Materials Science

2020, Volume 7, Issue 3: 312-322. doi: 10.3934/matersci.2020.3.312

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Transformation superplasticity of laminated CuAl₁₀Fe₃Mn₂ bronze-intermetallics composites

Marek Konieczny ^,

Department of Metals Science and Materials Technologies, Kielce University of Technology, Kielce, Poland

Received: 26 March 2020 Accepted: 05 June 2020 Published: 11 June 2020

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.
- aluminum bronze,
- intermetallics,
- laminated composite,
- transformation superplasticity,
- mechanical properties
Citation: Marek Konieczny. Transformation superplasticity of laminated CuAl10Fe3Mn2 bronze-intermetallics composites[J]. AIMS Materials Science, 2020, 7(3): 312-322. doi: 10.3934/matersci.2020.3.312

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Abstract

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.

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