Influence of Porosity on Mechanical Behavior of Porous Cu Fabricated via De-Alloying of Cu-Fe Alloy
Abstract
We report on a study of the mechanical behavior of porous Cu containing micron-sized pores and fabricated by de-alloying of a Cu-Fe precursor alloy. Our results show that the minimum volume fraction of pores that can be obtained by using an approach that involves de-alloying of a Cu-Fe precursor alloy is approximately 40 vol%. Moreover, the average pore size formed by de-alloying Cu-Fe of varying compositions is in the range of 1.5-4.0 μm. Our mechanical behavior results reveal that the yield stress increases from 3.9 to 58.6 MPa as the volume fraction of porosity decreases from 78.9% to 39.3%. Moreover, our data shows that the influence of porosity on the relative yield stress and relative Young's modulus conforms to the scaling equations of Gibson and Ashby as formulated for open-cell porous metals. The pore cell characteristics and deformation modes of porous Cu produced by de-alloying Cu-Fe alloys were discussed in the context of the observed fluctuations in the value of the constants C and n in the Gibson-Ashby scaling equation. The evolution of microstructure during compressive deformation of porous Cu was studied and the results reveal an increase in the fraction of low-angle grain boundaries, an increase in the number of twins and a decrease in the average grain size with increasing strain from 0% to 70%.
- Publication:
-
Metals and Materials International
- Pub Date:
- January 2019
- DOI:
- 10.1007/s12540-018-0168-6
- Bibcode:
- 2019MMI....25...83Z
- Keywords:
-
- Micro-sized porous Cu;
- Mechanical properties;
- Relative density;
- Microstructural evolution