Superplasticity of AlMgSi alloys

Kovács-Csetényi, E.; Torma, T.; Túrmezey, T.; Chinh, Nguyen Q.; Juhász, András; Kovács, I.

doi:10.1007/bf01133763

Cited by 14 publications

(3 citation statements)

References 3 publications

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“…[1][2][3][4] Commercial 6013 and 6066 alloys with standard chemical composition have been demonstrated to exhibit moderate superplastic properties [1][2][3] at T ≤ 540 • C. Fine grain structure was introduced in these materials by thermomechanical processing (TMP). 2,3) It was established that the low stability of fine grains in the 6XXX aluminum alloys under superplastic deformation limits ductility.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu and Zr Additions on the Superplastic Behavior of 6061 Aluminum Alloy

et al. 2002

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Experiments were conducted to evaluate the influence of zirconium and copper additions on superplastic behavior of a 6061 aluminum alloy. Fine grains were produced in a commercial grade of 6061 Al and a 0.15%Zr + 0.7%Cu-modified 6061 alloy by two-step thermomechanical processing. The superplastic properties and microstructure evolution of both alloys were examined in tension at temperatures ranging from 475 to 620 • C and strain rates ranging from 7 × 10 −6 to 2.8 × 10 −2 s −1 . It was shown using differential thermal analysis that both alloys exhibit the highest superplastic characteristics in a partially melted state. The 0.15%Zr + 0.7%Cu-modified 6061 aluminum alloy exhibits a maximum elongation-to-failure of 1300% at 590 • C and an initial strain rate of 2.8 × 10 −4 s −1 . In contrast, the highest total elongation of 350% (m ∼ 0.6) was achieved in the commercial grade 6061 alloy at 600 • C and a strain rate of 1.4 × 10 −4 s −1 . The results suggest the addition of Zr provides high stability of the fine-grained structure under superplastic deformation at high temperatures by precipitation of Al 3 Zr dispersoids. Apparently, the increased amount of liquid phase caused by the copper addition can enhance the superplastic properties of the 6061 alloy.

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Section: Introductionmentioning

confidence: 99%

Effect of Cu and Zr Additions on the Superplastic Behavior of 6061 Aluminum Alloy

et al. 2002

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“…Two studies report the application of the approach of Waldman and Paton and Hamilton to the commercial aluminum alloys 6061, 6063, and 6066, [20,21] but only the latter of these reported any degree of superplasticity.…”

Section: Introductionmentioning

confidence: 99%

New Process Produces Superplastic Aerospace/Automotive Aluminum Alloy

Troeger¹,

Starke

2000

Adv. Eng. Mater.

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“…In recent decades, aluminum alloys have attracted attentions of many researchers, engineers and designers as promising structural materials for automotive industry or aerospace applications. The aluminum alloys of (non-)heat-treatable with high strength are commonly used materials, such as 2024, 5083, 6061, 7055, 7075 and 7475 [20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Superplastic-like forming of lightweight alloys

Liu¹

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Conventional superplastic forming (SPF) is attractive for the current industrial fabrication of precision, large and complex-shaped sheet-metal components. This process requires a fine-grained material and is carried out at high temperatures (typically above 500º C for aluminum alloys and 900º C for titanium alloys) and slow forming rates (mostly strain rate slower than 10-3 s-1). To address these limitations, an advanced sheet-forming process has been designed by combining hot drawing and superplastic forming (namely gas forming) in a one-step operation to establish a fast forming technology. The process together with a nonisothermal heating system is referred to as superplastic-like forming. The aim of this work is to investigate (i) the relationship between process parameters, material draw-in and thickness distribution and (ii) the microstructural evolution, deformation mechanism and post-forming properties during forming. Target materials are commercial grade AA5083 and Ti-6Al-4V alloys. Tensile tests were performed for both materials to determine the optimal deformation conditions, i.e. temperature and strain rate. The flow stress data of AA5083 were used in the calibration of a material model for finite element modeling (FEM). The results showed that AA5083 can deform with reasonable flow stress and tensile elongation at 400º C and a strain rate of 2×10-3 s-1 and that Ti-6Al-4V alloy possesses good forming capability at 800º C and a strain rate of 10-3 s-1. A rectangular die cavity with multiple steps was used to demonstrate different amounts of material draw-in and surface expansion of the formed part in superplastic-like forming. The punch geometry was designed and validated through a parametric study during hot drawing. The measured drawing limits were used to determine the sheet ABSTRACT II size for hot drawing. The optimal dimensions of AA5083 and Ti-6Al-4V sheets are 200×200 and 210×210 mm 2 , respectively. The non-isothermal heating system is expected to maintain the sheet at a lower global (furnace) temperature. Meanwhile, a higher local temperature in specific zones, i.e. die radii, ensures that the material there has more ductility to flow. For AA5083, the entire forming was conducted at a global temperature of 400º C, but the material close to the die radii was selectively heated to 420º C. During superplastic-like forming of Ti-6Al-4V alloy, the global and local temperatures were 800 and 820º C, respectively. After completion of forming AA5083 in 8 min, a final part with maximum percentage thinning of 40% at the outward corners and 137% surface expansion was achieved. The forming of Ti-6Al-4V alloy was completed in 16 min, exhibiting a maximum percentage thinning of 54% at the outward corners and the surface expansion of 130%. Stress gradients and the corresponding strain rate differences at the outward corners in the forming sheet led to thinning gradient and plastic straining as a result of geometric inhomogeneity as demonstrated through finite element simulations of hot drawing and gas formi...

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Superplasticity of AlMgSi alloys

Cited by 14 publications

References 3 publications

Effect of Cu and Zr Additions on the Superplastic Behavior of 6061 Aluminum Alloy

Effect of Cu and Zr Additions on the Superplastic Behavior of 6061 Aluminum Alloy

New Process Produces Superplastic Aerospace/Automotive Aluminum Alloy

Superplastic-like forming of lightweight alloys

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