Effects of cell parameters at low strain rates on the mechanical properties of metallic foams of Al and 7075-T6 alloy processed by pressurized infiltration casting method. Issue 20 (29th October 2018)

• Record Type: Journal Article
• Authors: Soni, Bhasker; Biswas, Somnath
• Is Part Of: Journal of materials research. Volume 33:Issue 20(2018)
• Page Start: 3418
• Page End: 3429
• Publication Date: 2018-10-29
• Subjects: metal foams, -- elastic modulus, -- yield strength; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2018.281
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : Cell morphology and relative density (ρrel ) are two crucial intrinsic parameters controlling the mechanical properties of metal foams (MFs) and directly depend on their structure (closed/open-cell) and composition (affecting processing parameters). Here, we report on compressive studies of MFs of aluminum (Al) and 7075-T6 alloy processed via a customized route at strain rate, έ = 0.002 and 2.0 s −1 . In both sets of MFs, the strength and apparent elastic modulus ( E ) monotonically increased with ρrel at both έ. At έ = 2.0 s −1, an increase in cell size ( C s ) enhanced the strength of both sets of MFs, while at έ = 0.002 s −1, only the alloy foams showed strength increment. The densification strain (εd ) of Al foams at έ = 0.002 s −1 monotonically decreased with increasing ρrel, whereas the alloy foams collapsed before the onset of densification. None of the MFs showed any particular trend of εd at έ = 2.0 s −1 . The studies conclude that the mechanical properties of MFs with similar morphology, foam parameters, and processing route depend on έ and C s . Absorption energy ( W ) and absorption efficiency ( I m ) of the two sets of MFs were also compared.