Hot deformation behavior of 7150 aluminum alloy during compression at elevated temperature

Jin, N.; Zhang, Hui; Han, Yingchun; Wu, Wenxiang; Chen, Jianghua

doi:10.1016/j.matchar.2008.12.012

Cited by 256 publications

(69 citation statements)

References 15 publications

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“…At the beginning of deformation, the dislocation density increases rapidly, which leads to a sharp increase in the flow stress [6]. As deformation continues, the activation of dynamic softening mechanisms can partially or completely neutralise the effect of hardening mechanisms [3,7,26]. As a result, the slope of the flow stress flattens and may even become zero.…”

Section: Flow Stress Curvesmentioning

confidence: 99%

“…Therefore, these alloys have long been regarded as some of the best candidates for demanding structural applications in the aerospace and automotive industries. Among commercial aluminium alloys, 7xxx series alloys show the highest strength [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Processing parameters, such as the deformation temperature and strain rate, and material factors, such as chemical composition and microstructure of the starting material, are the main factors affecting the hot deformation flow stress. Thus, several studies have been performed to investigate the effect of processing parameters on the hot deformation behaviour of aluminium and its alloys [3,6,[14][15][16]. Furthermore, the flow stress behaviour of these materials has been modelled, and constitutive equations that consider the effects of the deformation temperature and strain rate have been proposed to predict the hot deformation flow stress [13,17,18].…”

Section: Introductionmentioning

confidence: 99%

“…The hot deformation behaviour of bulk aluminium alloys has been the subject of many studies [3,6,7,[14][15][16][19][20][21]. Nevertheless, the deformation behaviour of porous materials is different which leads to after-consolidation mechanical properties that cannot be attained through the conventional processing of cast and wrought alloys with similar chemical compositions [8].…”

Section: Introductionmentioning

confidence: 99%

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Hot deformation behaviour and flow stress prediction of 7075 aluminium alloy powder compacts during compression at elevated temperatures

Taleghani

Ruiz-Navas

Salehi

et al. 2012

Materials Science and Engineering: A

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Abstract:In the present study, the hot deformation behaviour of 7075 aluminium alloy powder compacts was studied by performing hot compression tests on a Gleeble 3800 machine. The main objectives were to evaluate the effect of the relative green density on the hot deformation behaviour and to model and predict the hot deformation flow stress of powder compacts using constitutive equations. For this pur-pose, powder compacts with relative green densities ranging from 83 to 95%, which were prepared by uniaxial cold pressing a commercial pre-mixed powder, were hot compressed at temperatures ranging from 350 • Cto450 • C and at true strain rates ranging from 0.01 s −1 to 10 s −1 . The true stress-true strain curves of the powder compacts exhibited a peak stress at a critical strain after which the flow stress remained nearly constant. As the deformation temperature increased or the strain rate and green density decreased, a decrease in the peak stress level was observed. The relationship between deformation tem-perature, strain rate, and the peak flow stress of powder compacts was described by the Zener-Hollomon parameter in an exponential equation containing relative green density compensated material constants and the deformation activation energy. The peak flow stresses calculated from the proposed formula were in good agreement with the experimental results, which confirms the applicability of the employed method for the prediction of the hot deformation flow stress of porous materials with different relative green densities.

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Section: Flow Stress Curvesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hot deformation behaviour and flow stress prediction of 7075 aluminium alloy powder compacts during compression at elevated temperatures

Taleghani

Ruiz-Navas

Salehi

et al. 2012

Materials Science and Engineering: A

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show abstract

“…In particular, the Al 7075 alloy has attracted considerable attention due to its high strength comparable to many steels, thus leading to ultrahigh specific strength, high fracture toughness, and resistance to stress corrosion cracking [5]. For this type of alloy, precipitation hardening is the main strengthening mechanism, whereas the hot workability becomes lower to enhance the strength of the alloy, as was shown in Al-Mg-Si and Al-Zn-Mg alloys [6], and in Al 7150 [7]. In order to overcome the low formability in the alloy, a limited study has suggested the application of a hot-stamping technique for aluminum alloys [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Jung

Lee

Kawasaki

2018

Metals

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Abstract:The present study investigates the significance of pre-strain on the T6 aging behavior of an Al 7075 alloy for evaluating the applicability of hot stamping. In practice, the alloy was pre-strained up to 15% during solution heat treatment at 480 • C prior to quenching, and artificial aging was conducted at 120 • C. The peak aging time and precipitation behavior were compared with the alloy with pre-straining at room temperature after quenching but immediately before the artificial aging. The results showed that increasing amounts of pre-strain tend to reduce the aging time up to 50% for achieving peak hardness, which is consistent with the alloy at the T6 condition. There is a limitation for the maximum attainable amount of pre-strain of 10% for the homogeneous distribution of strain when the alloy is strained at room temperature (RT) due to the low formability. The pre-strained alloy as hot stamping exhibited lowering of the peak reaction temperatures for dissolution and formation of Guinier-Preston (GP)-Zones and precipitated with increasing amounts of pre-strain towards 15% through the differential scanning calorimetry analysis, thereby confirming the shortening of the peak aging time. The present study confirms the excellent potential of the hot-stamping process to extend the capability of an Al 7075 alloy.

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Hot Deformation Behavior and Microstructural Evolution of Homogenized 7150 Aluminum Alloys Micro‐Alloyed with Zr and V

Shi¹,

Chen²

2012

ICAA13: 13th International Conference on Aluminum Alloys

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Hot deformation behavior of 7150 aluminum alloy during compression at elevated temperature

Cited by 256 publications

References 15 publications

Hot deformation behaviour and flow stress prediction of 7075 aluminium alloy powder compacts during compression at elevated temperatures

Hot deformation behaviour and flow stress prediction of 7075 aluminium alloy powder compacts during compression at elevated temperatures

Effects of Pre-Strain on the Aging Behavior of Al 7075 Alloy for Hot-Stamping Capability

Hot Deformation Behavior and Microstructural Evolution of Homogenized 7150 Aluminum Alloys Micro‐Alloyed with Zr and V

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