Correlation of uniaxial data with forming limit curves of Al-Mg alloy deformed at ambient and high temperatures

Mukhopadhyay, J.; Mukherjee, Amiya K.; Mallik, A.K.

doi:10.1007/bf03372189

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…The similar effect of improvement in the strain rate sensitivity with temperature was reported earlier by Mukhopadhyay and colleagues. 4,5 There was not much difference in the level of FLCs on the biaxial side of FLC at 200°C and 250°C.…”

Section: Al6014mentioning

confidence: 89%

“…Warm forming has widely been investigated since 1960s. [1][2][3] Mukhopadhyay and colleagues 4,5 conducted investigations on the uniaxial as well as biaxial deformation behavior of Al-Mg alloys at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Warm forming has widely been investigated since 1960s. 1–3 Mukhopadhyay and colleagues 4,5 conducted investigations on the uniaxial as well as biaxial deformation behavior of Al–Mg alloys at high temperatures. They found that for Al–Mg alloys, the increase in ductility and formability at high temperatures is mainly because of the increase in strain rate sensitivity.…”

Section: Introductionmentioning

confidence: 99%

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Elevated temperature forming limit strain diagrams of automotive alloys Al6014-T4 and DP600: A case study

Saxena

Drotleff

Mukhopadhyay

2016

The Journal of Strain Analysis for Engineering Design

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The press formability of the automotive materials such as aluminum alloys, magnesium alloys and steels is influenced by forming temperatures. While adjusting the temperature level of die, punch and binder, the lightweight materials can successfully be formed, especially for complex automotive body parts. The objective of this case study is to determine the forming limit curves of Al6014 and DP600 alloy sheet at elevated temperatures in specific range of 200°C and 250°C suitable for press operation in long-run production cycles. The focus is set on Al6014 and DP600 as these two materials are widely used in automotive panels due to their high strength and lightweight and improved resistance to corrosion. DP600 is sometimes preheated before forming to avoid cracks. Thus, it is essential to study the effect of preheating temperature on the formability. Experiments were conducted at forming temperatures of 200°C and 250°C and at low punch speed. The measurement of train distribution was carried out online using digital image correlation with the optical deformation measurement system GOM Aramis. Both Al6014 and DP600 alloys were found to have good drawability and stretchability. It was found that for Al6014, the forming limit curve level increases with temperature. On the contrary, DP600 showed slight decrease in the level of forming limit curve as temperature was increased. Warm formability for these alloys was further characterized through part depth and percentage thinning measurements.

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Section: Al6014mentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Elevated temperature forming limit strain diagrams of automotive alloys Al6014-T4 and DP600: A case study

Saxena

Drotleff

Mukhopadhyay

2016

The Journal of Strain Analysis for Engineering Design

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High Rate Superplastic Deformation Mechanisms in IN90211 Mechanically Alloyed Aluminum

Bieler

Mukherjee

1990

MRS Proc.

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IN90211 has exhibited superplastic elongations above 500% at high homologous temperatures (0.76–0.82 Tm). A high strain rate and flow stress for optimum elongation was measured (1–5/sec, 20–60 MPa, 425–485 °C). The apparent strain rate sensitivity of m≈0.25 differs from the usual m≈0.5 observations of superplastic deformation. An analysis of the data at several strains indicates a highly temperature dependent threshold stress is present, with either a n=2 or n=3 assumption for the stress exponent. The magnitude of the threshold stresses in IN90211 are smaller than usually observed in a dispersion strengthened matrix (1–20% instead of ≈50% of the Orowan stress). Experimental evidence from creep experiments supports the n=3 deformation mechanism as the rate limiting step of deformation.

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Correlation of uniaxial data with forming limit curves of Al-Mg alloy deformed at ambient and high temperatures

Cited by 2 publications

References 12 publications

Elevated temperature forming limit strain diagrams of automotive alloys Al6014-T4 and DP600: A case study

Elevated temperature forming limit strain diagrams of automotive alloys Al6014-T4 and DP600: A case study

High Rate Superplastic Deformation Mechanisms in IN90211 Mechanically Alloyed Aluminum

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