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Hussey, Bob; Wilson, Jo

doi:10.1007/978-1-4615-5777-7_2

Cited by 3 publications

(3 citation statements)

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“…Both of the Fe-free and Fe-added alloys contain Mg and Si in the standard composition of the A6082 alloy. 9) Solidus and liquidus temperatures were measured using a differential scanning calorimetry (DSC). 6) Figure 1 shows the schematic illustration of the D-SSF process developed in our group.…”

Section: Methodsmentioning

confidence: 99%

Effects of β-Mg<sub>2</sub>Si Precipitates on Semi-Solid Microstructures of Wrought Al–Mg–Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process

et al. 2013

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The Deformation-Semi-Solid-Forming (D-SSF) process has been developed to produce superior semi-solid microstructures of fine ¡-Al grains and refined intermetallic compounds. The wrought AlMgSi (6xxx alloys) alloys are generally considered to be complicated in controlling the semi-solid forming process because of the high temperature sensitivity to the liquid fraction. Additional alloying elements to the 6xxx series aluminum alloys are usually required to produce second-phase particles in order to refine the spheroidized ¡-Al grains during the reheating process. Generally, the ¢-Mg 2 Si phase is precipitated in the supersaturated Al matrix with Mg and Si atoms at various heat treatments in the manufacturing process of AlMgSi alloys. In this study, the annealing process was performed for the precipitation of the equilibrium ¢-Mg 2 Si phase. By applying mechanical deformation, the stored energy is much increased by the presence of the rod-like ¢-Mg 2 Si precipitates, which accelerates recrystallization during heating to the semi-solid state. Fine ¡-Al grains with the average size of 104 µm were achieved by annealing and 60% cold-rolling in the alloy without additional alloying elements. The coarsened harmful Fe-intermetallic compounds were fragmented and became effective particles to refine the ¡-Al grains. Moreover, the combination of the fragmented Fe-intermetallic compounds and ¢-Mg 2 Si precipitates can further refine the ¡-Al grains with the average size of 79 µm by annealing and 40% cold-rolling.

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Section: Methodsmentioning

confidence: 99%

Effects of β-Mg<sub>2</sub>Si Precipitates on Semi-Solid Microstructures of Wrought Al–Mg–Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process

et al. 2013

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“…The composition of the outer AA1230 clad layer is comparable with the composition of aluminum alloy AA1050. [14] AA1050 specimens were masked with a polymer maskant. An area of 100 × 100 mm was cut out of the mask on both sides of the specimen and it was connected with a copper wire.…”

Section: Experimental Potentiodynamic Anodizingmentioning

confidence: 99%

Potentiodynamic anodizing of aluminum alloys in Cr(VI)‐free electrolytes

Put

Abrahami

Elisseeva³

et al. 2016

Surface & Interface Analysis

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The aerospace industry progressively develops alternatives for chromic acid anodizing, because Cr(VI) is known to be toxic and carcinogenic. In this work, potentiodynamic anodizing of AA1050 and AA2024-T3 clad was performed in phosphoric-sulfuric acid (PSA) and sulfuric acid (SAA). All anodizing cycles started with a linear voltage sweep, followed by a constant voltage, or a dynamic voltage. Current density responses were recorded during each anodizing cycle and comprised different stages, which could be related to growth phases of the anodic oxide film. Interesting differences were found between cycles with an intermediate increase in anodizing voltage versus cycles with an intermediate decrease in voltage. Cycles including an increase in voltage resulted in higher anodic oxide formation efficiencies because of a temporary exceedance of the steady state current (recovery period) directly after the voltage step. Also, a sudden decrease in voltage led to distinct border between a fine and coarse region in the film morphology, while a sudden increase in voltage did not. For prolonged anodizing in PSA, coarsening of the upper film part was observed because of the high solubility of Al 2 O 3 in phosphoric acid. Pore walls close to the outer surface did not only get thinner, but completely dissolved in the electrolyte. Consequently, anodic oxide formation efficiencies were higher for SAA than for PSA.

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“…In the 60s of the 20 th century, great efforts had been made in countries like U.S. and U.K to get a higher fracture toughness (K IC ) and lower da/dN values of titanium alloys by reducing the content of interstitial elements such as O and N and obtaining lamellar microstructures with thick layers and coarse primary grains. That resulted in the development of new-type damage tolerance titanium alloys such as Ti-6Al-4V β ELI and Ti-6-22-22S and their use in F-22 fighter fuselage structures [3] . However, coarse lamellar microstructures lead to lower properties in plasticity, impact toughness, low-cycle fatigue and welded joints characteristics and so on, which explains why the application of Ti-6-22-22S titanium alloy with the coarse lamellar microstructure is limited in F-22 aircraft [4] .…”

Section: Introductionmentioning

confidence: 99%

Combined Strengthening-Toughening Technology of High Property Titanium Alloys for Aviation Uses in China

Zhi

Wang

Shang

et al. 2015

AMM

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Combined strengthening-toughening technologies of several high property titanium alloys, such as TC4-DT, TC6, TC18, TC21 for aviation uses, have been studied via purification, quasi-b heat treatment, quasi-b forging and grain refinement. The effects of microstructure parameters of lamellar structure, basket-weave structure, refined grain structure etc. on the comprehensive mechanical properties of titanium alloys have been analyzed. The results have shown that, to acquire highly comprehensive static mechanical properties and excellent damage tolerance properties, quasi-b treatment and purification processing should be used for medium strength titanium alloys to get high ductility lamellar structure, while quasi-b forging processing be utilized for high strength titanium alloys to obtain high ductility basket-weave structure. Grain refinement processing is very necessary for both the strength levels of titanium alloys.

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Cited by 3 publications

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Effects of β-Mg<sub>2</sub>Si Precipitates on Semi-Solid Microstructures of Wrought Al–Mg–Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process

Effects of β-Mg<sub>2</sub>Si Precipitates on Semi-Solid Microstructures of Wrought Al–Mg–Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process

Potentiodynamic anodizing of aluminum alloys in Cr(VI)‐free electrolytes

Combined Strengthening-Toughening Technology of High Property Titanium Alloys for Aviation Uses in China

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Cited by 3 publications

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Effects of &beta;-Mg<sub>2</sub>Si Precipitates on Semi-Solid Microstructures of Wrought Al&ndash;Mg&ndash;Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process

Effects of &beta;-Mg<sub>2</sub>Si Precipitates on Semi-Solid Microstructures of Wrought Al&ndash;Mg&ndash;Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process

Potentiodynamic anodizing of aluminum alloys in Cr(VI)‐free electrolytes

Combined Strengthening-Toughening Technology of High Property Titanium Alloys for Aviation Uses in China

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Effects of β-Mg<sub>2</sub>Si Precipitates on Semi-Solid Microstructures of Wrought Al–Mg–Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process

Effects of β-Mg<sub>2</sub>Si Precipitates on Semi-Solid Microstructures of Wrought Al–Mg–Si Based Alloys Produced by Deformation-Semi-Solid-Forming Process