Mechanical properties and formability of an Mg–6%Li–1%Zn alloy thin sheet at elevated temperatures

Wu, Horng-yu; Zhou, Geng-Zhong; Gao, Zhen-wei; Chiu, Chien‐Liang

doi:10.1016/j.jmatprotec.2007.12.045

Cited by 23 publications

(8 citation statements)

References 17 publications

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“…This occurs due to the extrusion of deformed material around the periphery, specifically at the centre, paving the way for movement of material when it reaches plasticity. Hence at lower aspect ratio, say 0.5, the rate of extrusion is minimal when compared to higher aspect ratio [27]. Specifically, when the change in aspect ratio increases from 0.5 to 1.5, it is noticed that the k value reduces and the n value increases in the power law.…”

Section: Effect Of Aspect Ratio and Densitymentioning

confidence: 93%

Investigation of high temperature deformation process of aluminium based alloys using response surface methodology

Ramesh¹,

Senthilvelan²

2012

Materials at High Temperatures

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The influence of flow properties of aluminium alloys (Al -5Si, Al -4Mg,RR58) obtained from aluminium powder is discussed. The constitutive equations relating flow-stress, temperature, density, strain, aspect ratio have been analysed in order to establish structure -property correlations. These response variables have generally been investigated by means of hot compression tests with the help of statistical analysis. In statistical techniques, response surface methodology has been used for this investigation. It is a collection of mathematical and statistical techniques that is useful for the analysis of problems in which the response is influenced by several variables. A mathematical model has been developed to compute the flow stress which combines the above mentioned process parameters. The main and interaction effects of the process parameters have also been studied using ANOVA techniques. The proposed mathematical model has been validated by the experimental results available from earlier investigations. The proposed model can be applied to predict the magnitude of flow stress during metal working of aluminium alloys. The results show that flow stress is more sensitive to strain and temperature than to other parameters.

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Section: Effect Of Aspect Ratio and Densitymentioning

confidence: 93%

Investigation of high temperature deformation process of aluminium based alloys using response surface methodology

Ramesh¹,

Senthilvelan²

2012

Materials at High Temperatures

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“…A three electrode cell with sample as working electrode, saturated calomel electrode (SCE) as reference electrode and platinum sheet as counter electrode were employed in this test. Electrochemical impedance spectroscopy (EIS) was also measured at the open circuit potential in 3·5%NaCl from 10 to 22 days immersion over a frequency range from 105 to 10 −2 Hz, with an amplitude perturbation of 5 mV. The schematic diagram of the set-up for the hydrogen evolution method is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Mg–Li alloys are therefore good candidates for superlight structure materials in aerospace and weapon industries 1,2. The preparation of Mg–Li alloy has been widely investigated and the performance of Mg–Li alloy has been improved during the past decade 3 – 5…”

Section: Introductionmentioning

confidence: 99%

Corrosion protection of Mg–11Li–3Al–0·5RE alloy using hybrid epoxy/silica conversion coatings

Zhang

Gao³

et al. 2013

Corrosion Engineering, Science and Technology

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In order to obtain effective corrosion protection for Mg-11Li-3Al-0?5 rare earth alloy, a combined epoxy/SiO 2 hybrid conversion coating was investigated in this paper. Initially ceria or phytic acid conversion coatings were applied on the substrate, then an epoxy/SiO 2 hybrid coating was applied on top of the conversion coating. Potentiodynamic polarisation curves were used to evaluate the effects of the silica content on corrosion resistance, and an optimum was confirmed at 3 wt-%. Hydrogen evolution and salt spray testing were employed to compare the corrosion resistance of the ceria and phytic acid based hybrid coatings and results indicated that the phytic acid hybrid coating was more effective than the ceria based coating. This was ascribed to reaction between the phytic acid functional groups (hydroxyl and phosphate) with the epoxy/SiO 2 hybrid coatings increasing adhesion between the coatings. The corrosion of the phytic acid based hybrid coating was investigated using electrochemical impedance spectroscopy which confirmed that a diffusion mechanism could explain the overall corrosion process and the advantages of the phytic acid hybrid coating.

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“…Preferably, forming operation is done in most of the engineering applications, which requires annealing procedures, microstructure and characterization of the sheets and their relations to attain higher formability [10]. The characterization involves the experimental determination of microstructural aspects, crystallographic texture, tensile properties, and formability parameters such as the strain hardening exponent(n), plastic strain ratio(r), planar anisotropy(∆r) and limiting drawing ratio (LDR) [5,[11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…A serious problem arising in the plastic deformation of Al-Mg alloys at room temperature is jerky flow or the Portevin-Le Chatelier (PLC) effect. It is marked by the formation of deformation bands that leave undesirable traces on the surface of the final product and repeated stress serrations in the stress-strain curves [8][9][10][11][12][13][14]16]. The PLC effect is attributed to dynamic interactions between mobile solute atoms and dislocations, termed dynamic strain aging (DSA).…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu Content on the Formability and Portevin-Le Chatelier Effect of Al-Mg Alloys

Cheng

Zhang

Zhuang

et al. 2015

MSF

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Al-Mg alloys developed for auto body sheets with different Cu contents were fabricated in the laboratory scale. The effects of Cu content on the microstructures, formability and Portevin–Le Chatelier(PLC) effect of the alloys were investigated by polarizied optical microscopy and room temperature tensile testing. It has been found that with increasing Cu content, there was little change of the strain hardening exponent, but the plastic strain ratio and limiting drawing ratio increased firstly and then decreased. A quantitative statistical analysis of the characteristics of the PLC effect was made, including the stress drop and the reloading time, which follow a common linear relationship with plastic strain, and the increase rate of stress drop and reloading time was bigger with more Cu content. A detailed discussion of the corresponding mechanism of Cu and Cu-containing precipitates on the dynamic strain aging(DSA) was made.

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Mechanical properties and formability of an Mg–6%Li–1%Zn alloy thin sheet at elevated temperatures

Cited by 23 publications

References 17 publications

Investigation of high temperature deformation process of aluminium based alloys using response surface methodology

Investigation of high temperature deformation process of aluminium based alloys using response surface methodology

Corrosion protection of Mg–11Li–3Al–0·5RE alloy using hybrid epoxy/silica conversion coatings

Effect of Cu Content on the Formability and Portevin-Le Chatelier Effect of Al-Mg Alloys

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