Mechanical behavior and properties of mechanically alloyed aluminum alloys

Garrett, R. K.

doi:10.1007/bf02648961

Cited by 36 publications

(13 citation statements)

References 4 publications

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“…A similar stress drop phenomenon has been reported in other mechanically alloyed (MA) fine-grained Al alloys [11,[28][29][30] and conventional Al-Mg alloys. [31,32] For example, in an as-extruded MA Al-4Mg-1.5O-0.8C alloy, [28] characterized by a complex network of fine dislocation cells, the stress drop was attributed to the collective movement of large numbers of mobile dislocations that were previously pinned.…”

Section: B Tensile Behaviorsupporting

confidence: 78%

“…[8,11,12] Spray-atomized 5083 Al alloy powders were mechanically milled in a liquid nitrogen slurry. The cryomilled powders were blended mechanically with different volume fractions of unmilled 5083 powders (15,30, and 50 pct, respectively) in an inert atmosphere to achieve a uniform distribution of unmilled powders. The powders used for cryomilling and for the unmilled additions were from the same spray-atomized batch.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

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Deformation behavior of bimodal nanostructured 5083 Al alloys

Han

Lee

Witkin

et al. 2005

Metall Mater Trans A

244

120

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Cryomilled 5083 Al alloys blended with volume fractions of 15, 30, and 50 pct unmilled 5083 Al were produced by consolidation of a mixture of cryomilled 5083 Al and unmilled 5083 Al powders. A bimodal grain size was achieved in the as-extruded alloys in which nanostructured regions had a grain size of 200 nm and coarse-grained regions had a grain size of 1 m. Compression loading in the longitudinal direction resulted in elastic-perfectly plastic deformation behavior. An enhanced tensile elongation associated with the occurrence of a Lüders band was observed in the bimodal alloys. As the volume fraction of coarse grains was increased, tensile ductility increased and strength decreased. Enhanced tensile ductility was attributed to the occurrence of crack bridging as well as delamination between nanostructured and coarse-grained regions during plastic deformation.

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Section: B Tensile Behaviorsupporting

confidence: 78%

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Deformation behavior of bimodal nanostructured 5083 Al alloys

Han

Lee

Witkin

et al. 2005

Metall Mater Trans A

244

120

View full text Add to dashboard Cite

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“…As mentioned above, there are many coarse MgZn 2 particles is the Poisson's ratio of 0.33, r s is the average radius of precipitation, r 0 is the radius of dislocation core (r 0 ¼ 2b), s is the inter-particles distance. 19) If r s is assumed to be 20 nm and s is assumed to be 5 nm, the calculated value of Orowan strength of the as-aged sample is 334 MPa. The high strength of this alloy is attributed to grain refinement strengthening and precipitation-strengthening.…”

Section: Mechanical Properties Of the Nanostructured Al-mentioning

confidence: 99%

Effect of Precipitations on Microstructures and Mechanical Properties of Nanostructured Al-Zn-Mg-Cu Alloy

Chen

Yang

2008

Mater. Trans.

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A bulk nanostructured Al-Zn-Mg-Cu alloy with high contents of alloy elements was fabricated by cryomilling followed by spark plasma sintering (SPS) techniques. Higher strain and lower strength were obtained in the SPS-processed Al-Zn-Mg-Cu alloy samples. This is due to the agglomeration of MgZn 2 precipitated on the contact zones of powders during the SPS process. The strength of the Al-Zn-Mg-Cu alloy can be improved further by an optimize heat treatment technique, after which the precipitation-hardening effect of MgZn 2 particles precipitated homogeneously in grain interiors was enhanced. The experimental results have shown that modifying the MgZn 2 size and distribution is beneficial to improve the mechanical property of the nanostructured Al-Zn-Mg-Cu alloy.

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“…The value of K is dependent on the alloy composition and microstructure of Al alloys. An Al-4 wt pct Mg alloy was estimated to have a K of 0.22 MPa m 1/2 , [35] and increasing the Mg content to 5.18 wt pct changed the estimate to 0.28 MPa m 1/2 . [36] However, adding Mn did not substantially change the value of K. [37] Using the literature data, K is linearly interpolated (a reasonable assumption in the current composition range) to be 0.24 MPa m 1/2 for 5083 and 0.27 MPa m 1/2 for 5356 Al.…”

Section: Strengthening Mechanismsmentioning

confidence: 99%

The effect of friction stir processing on 5083-H321/5356 Al arc welds: Microstructural and mechanical analysis

Fuller

Mahoney

2006

Metall Mater Trans A

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Friction stir processing (FSP) is used locally to modify the microstructure and thus mechanical properties of 5083-H321/5356 aluminum gas metal arc welds (GMAWs). Four specimen approaches were examined: as-arc welded, weld toe FSP (with arc weld on either the advancing or the retreating side of tool), and weld crown FSP. Microstructures within the fine-grained FSP region contained smaller constituent particles, Mg 2 Si and Al 6 (Fe,Mn), than those particles found in the arc weld nugget, heat-affected zone (HAZ), and base-metal (BM) locations. The FSP improved the monotonic tensile strength, yield strength, and elongation of 5083-H321/5356 Al arc welds by 6 to 9 pct, 7 to 13 pct, and 46 to 80 pct, respectively. The addition of FSP produced a 30 pct increase in the load necessary to reach 10 7 cycles during four-point bending fatigue. An analysis of strengthening mechanisms determined that solid-solution, grain-size, and precipitation strengthening made contributions to the calculated yield strength of the BM, arc weld nugget, and FSP regions. In addition, the strength mechanism analysis demonstrated that FSP increased the amount of grain-size strengthening and precipitate strengthening by nearly 110 MPa, when compared to the arc weld nugget.

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Mechanical behavior and properties of mechanically alloyed aluminum alloys

Cited by 36 publications

References 4 publications

Deformation behavior of bimodal nanostructured 5083 Al alloys

Deformation behavior of bimodal nanostructured 5083 Al alloys

Effect of Precipitations on Microstructures and Mechanical Properties of Nanostructured Al-Zn-Mg-Cu Alloy

The effect of friction stir processing on 5083-H321/5356 Al arc welds: Microstructural and mechanical analysis

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