Mechanical properties of A356 and ZA27 metallic syntactic foams at cryogenic temperature

Fiedler, Thomas; Al-Sahlani, Kadhim; Linul, Petrică-Andrei; Linul, Emanoil

doi:10.1016/j.jallcom.2019.152181

Cited by 54 publications

(22 citation statements)

References 19 publications

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“…The pure Al foams are subjected to many restrictions in engineering applications owing to its low mechanical properties, such as the plateau stress and the yield strength. For the past few years, the Al matrix composite foams (AMCFs) with microreinforcement (like fly ash, SiC, Al 2 O 3, carbon fibres, expanded particles, and cenospheres) have attracted much attention. Du et al conducted the compressive tests using Al syntactic foams reinforced by 1‐vol% SiC, showing that the yield stress and energy absorption capacity improve 194.5% and 69.4% compared with pure Al foams, respectively.…”

Section: Introductionmentioning

confidence: 99%

Compression‐compression fatigue performance of aluminium matrix composite foams reinforced by carbon nanotubes

Yang

et al. 2020

Fatigue Fract Eng Mat Struct

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The compression‐compression fatigue performance of carbon nanotube (CNT) reinforced aluminium matrix composite foams (AMCFs) were investigated. The ε‐N curves of AMCFs are composed of three stages (the elastic, strain hardening, and rapid accumulation stages), while the fatigue strain of AMCFs accumulates very rapidly in stage III compared with Al foams. The fatigue strength of AMCFs with CNT contents of 2.0, 2.5, and 3.0 wt% increases by 6%, 44%, and 102% than Al foams, respectively. Different from Al foams' deformation of layer‐by‐layer, the main failure modes of AMCFs are the brittle fracture and collapse of pores within significant shear deformation bands under fatigue loading. The uniform distribution of CNTs and good interfacial bonding of CNTs and Al matrix is the important factor for the improvement of fatigue properties of AMCFs.

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Section: Introductionmentioning

confidence: 99%

Compression‐compression fatigue performance of aluminium matrix composite foams reinforced by carbon nanotubes

Yang

et al. 2020

Fatigue Fract Eng Mat Struct

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“…Typically, in these materials, the size, or at least the size distributions, of hollow fillers are deliberately set, while their relative position can range from arbitrary to ordered. Among them, metal matrix syntactic foams (MMSFs) are high-density foams produced with a metallic (Al [2][3][4][5], Mg [6][7][8][9], Zn [2,[10][11][12], Ti [13][14][15], or Fe [16][17][18][19][20] based) matrix and various types of porous fillers (hollow spheres [21] or other porous particles [22]) by molten metal infiltration [23,24]. MMSFs can be utilized as high-performance energy absorbers in vehicles [25] and defensive technologies [26], or as lightweight structural elements.…”

Section: Introductionmentioning

confidence: 99%

Fracture Toughness of Hollow Glass Microsphere-Filled Iron Matrix Syntactic Foams

et al. 2020

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In this study, iron-based metal matrix syntactic foam (MMSF) containing hollow glass microspheres as filler was investigated with respect to notch sensitivity aspects. The MMSF was produced by means of metal powder injection molding. The notch sensitivity was studied via (i) elastic-plastic fracture mechanics measurements (determination of R-curves based on three-point bending tests) and (ii) Charpy impact tests. In both cases, the samples were machined with two different (U- and V-shaped) notch geometries. The critical J-integral value was determined for both notch types, which resulted in lower fracture toughness values in the case of the V-shaped notches and thus notch sensitivity of the material. This finding can be connected to the characteristics of the deformation zone and the associated stress concentration at the tip of the machined notches. The results were confirmed by Charpy impact tests showing ~30% higher impact energy in the case of the U-shaped notch. The failure modes were investigated by means of scanning electron microscopy. In contrast to the bulk material, the MMSF showed brittle fracture behavior.

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“…Figure 12 c shows a typical chip formed while cutting a 5% volume fraction of alumina reinforced in the AZ31 matrix. Through compression tests conducted on syntactic foams, it is clear that an increase in the volume fraction of ceramic microspheres leads to a reduction in material ductility and strain to fracture [ 7 , 8 ]. At a lower volume fraction of microsphere reinforcements (5%), the chips formed were found to be semicontinuous and curly in form compared to discontinuous serrated chips formed during cutting higher volume fraction syntactic foams (15%).…”

Section: Resultsmentioning

confidence: 99%

Cryogenic Drilling of AZ31 Magnesium Syntactic Foams

et al. 2020

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Machined surface quality and integrity affect the corrosion performance of AZ31 magnesium composites. These novel materials are preferred for temporary orthopedic and vascular implants. In this paper, the drilling performance of AZ31-magnesium reinforced with hollow alumina microsphere syntactic foam under LN2 cryogenic, dry, and Almag® Oil is presented. Cutting tests were conducted using TiAlN physical vapor deposition (PVD) coated multilayer carbide and K10 uncoated carbide twist drills. AZ31 magnesium matrices were reinforced with hollow alumina ceramic microspheres with varying volume fractions (5%, 10%, 15%) and average bubble sizes. Experimental results showed that the drilling thrust forces increased by 250% with increasing feed rate (0.05 to 0.6 mm/tooth) and 46% with the increasing volume fraction of alumina microspheres (5% to 15%). Cryogenic machining generated 45% higher thrust forces compared to dry and wet machining. The higher the volume fraction and the finer the average size of hollow microspheres, the higher were the thrust forces. Cryogenic machining (0.42 µm) produced a 75% improvement in surface roughness (Ra) values compared to wet machining (1.84 µm) with minimal subsurface machining-induced defects. Surface quality deteriorated by 129% with an increasing volume fraction of alumina microspheres (0.61 µm to 1.4 µm). Burr height reduction of 53% was achieved with cryogenic machining (60 µm) compared to dry machining (130 µm). Overall, compared to dry and wet machining methods, cryogenic drilling can be employed for the machining of AZ31 magnesium syntactic foams to achieve good surface quality and integrity.

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Mechanical properties of A356 and ZA27 metallic syntactic foams at cryogenic temperature

Cited by 54 publications

References 19 publications

Compression‐compression fatigue performance of aluminium matrix composite foams reinforced by carbon nanotubes

Compression‐compression fatigue performance of aluminium matrix composite foams reinforced by carbon nanotubes

Fracture Toughness of Hollow Glass Microsphere-Filled Iron Matrix Syntactic Foams

Cryogenic Drilling of AZ31 Magnesium Syntactic Foams

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