Properties of AA6061 Processed by Multi-Axial Compressions/Forging (MAC/F)

Cherukuri, Balakrishna; Srinivasan, Raghavan

doi:10.1080/10426910500471649

Cited by 48 publications

(21 citation statements)

References 5 publications

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“…The procedure of MAC has been used to investigate the properties of several materials including AA1100 [15], AA3104 [16] and AA6061 [17,18] aluminum alloys, Al-4.11% Cu [19], Al-5.5% Cu [20] and high purity Cu [19]. Nevertheless, only limited information is available at present comparing the properties and microstructures of samples processed by MAC and other SPD procedures.…”

Section: Introductionmentioning

confidence: 99%

Using an Al–Cu binary alloy to compare processing by multi-axial compression and high-pressure torsion

Zhang

et al. 2013

Materials Science and Engineering: A

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a b s t r a c tAn Al-4% Cu alloy was selected as a model material in order to compare two different procedures for imposing severe plastic deformation: multi-axial compression (MAC) and high-pressure torsion (HPT). In MAC a compressive strain is applied to prismatic samples in a sequential order along three orthogonal directions and the process is repeated to large numbers of passes in order to attain high strains. In HPT a thin disk is held between anvils and subjected to a high applied pressure and concurrent torsional straining. The results show that HPT is the optimum procedure for producing a homogeneous ultrafinegrained material. Specifically, HPT is preferable because it produces materials having a larger degree of homogeneity and the equilibrium grain sizes are smaller and the Vickers microhardness values are higher than when processing by MAC.

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Section: Introductionmentioning

confidence: 99%

Using an Al–Cu binary alloy to compare processing by multi-axial compression and high-pressure torsion

Zhang

et al. 2013

Materials Science and Engineering: A

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“…Grain boundaries are grouped in three angle regimes: 1) 2-5˚ (low angle), 6-15˚ (medium angle), and >15˚ (high angle), after previous EBSD studies of aluminum alloys [13][14]. In contrast, conventional AA6061 exposed to only the T6 heat treatment is expected to have a typical grain size of ~75-100 µ m and a random orientation profile with both high angle and low angle boundaries [16][17]. [15]), while 15˚ is typically the angle chosen to separate sub-boundaries and high angle boundaries.…”

Section: Resultsmentioning

confidence: 99%

Preferential Site Precipitation and Subcell Stability in AA6061 Sandwich Cores

Bouwhuis

Hibbard

2006

MRS Proc.

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Periodic cellular metal (PCM) sandwich cores can be considered hybrids of the solid and gas type. These can be designed at both the architectural and microstructural levels. PCM cores with 95% open porosity have been constructed from perforated 6061 aluminium alloy (AA6061) sheets using a perforation-stretching method. This method places planar, periodically-perforated sheet metal in an alternating-pin jig. The pins apply force out-of-plane, plastically deforming the sheet metal into a truss-like array of struts (i.e. metal supports) and nodal peaks (i.e. strut intersections). The result is a non-uniform work-hardened profile exhibiting large deformation at the nodes and small deformation at the struts.For identical PCM architectures, this study looks at the interaction of microstructural strengthening mechanisms and the resultant performance of PCM truss cores. Beginning with fabrication, work-hardening induced a subcell network of dislocation tangles within the AA6061 matrix. Following this stage, a variety of microstructures were created through recovery, recrystallization and precipitation mechanisms. Microhardness measurements and electron backscattered diffraction (EBSD) characterization were employed through truss core cross-sections in order to study the microstructural gradients of subcell size as well as interaction between subcells and precipitates in the truss cores. To determine the effect of microstructure on mechanical performance, PCM cores were compressed to study deformation and collapse mechanisms.The present data can be used to illustrate engineering at the architectural and microstructural levels to achieve a range of mechanical properties in a hybrid sandwich core.

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“…Both velocity change and constant deformation rate tests were conducted on flat tensile samples at different temperatures in the range of 250º to 400ºC. These results are summarized in Figure ( [52]. The tensile flow curves show that as temperature is increased there is a continuous decrease in the yield strength of the SPD processed material.…”

Section: Mechanical Property Changes Due To Spdmentioning

confidence: 94%

“…For comparison, samples prepared by two other SPD processes, multi-axial compression/forging (MAC/F) and accumulative roll bonding (ARB) were also tested using these techniques [51,52]. Figures 4.7-4.10 show the results of these mechanical property evaluations.…”

Section: Mechanical Property Changes Due To Spdmentioning

confidence: 99%