The tensile behavior of porous metals made by GASAR process
- Slovak Academy of Sciences, Bratislava (Slovakia). Inst. of Materials and Machine Mechanics
The tensile behavior of porous metals (Cu, Ni) made by the solid-gas eutectic solidification (GASAR) process was studied with respect to the macro- and microscopic point of view. In the macroscopic approach, the percolation power-law dependence of the tensile properties on porosity was observed. Obtained characteristic exponents of 0.2% yield stress, ultimate tensile strength and strain at peak stress were related to the value of the critical exponent of the modulus of elasticity predicted by percolation theory. The ductility of solid copper can explain the variations in the values of the obtained characteristic exponents for porous copper. In the microscopic approach, the modified model for out-of-plane tension of regular honeycombs was used to relate tensile behavior of porous metals with microstructure. The model failed at high porosity due to the irregular structure of the porous metals. This indicates that any model based on the regular structure is not valid and supports the validity of the percolation model.
- OSTI ID:
- 665196
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 15 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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