scholarly journals Flow stress characterization of magnesium alloys at elevated temperatures: A review

2021 ◽  
Vol 2047 (1) ◽  
pp. 012002
Author(s):  
J D Yoo ◽  
M C Kim ◽  
E J Kim ◽  
M K Razali ◽  
M S Joun
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Mathematical Form ◽  
Flow Models ◽  
Stress Models ◽  
Family Models

Abstract The flow behaviors of magnesium alloys are too complicated to be simply formulated in a mathematical form. Most researches have based metallurgically or phenomenologically on specific functions with many constants, which could be applied only to the limited magnesium alloys under specific conditions. In this study, a review on the studies of flow stress characterization of magnesium alloys is conducted and the possibility of using the traditional piecewise C-m model and its extension to characterize the magnesium alloys is emphasized. The formulations of major flow models are given with three typical applications to magnesium alloy AZ80 and its characteristics are demonstrated through comparison of the fitted flow behaviors with their associated experiments and various flow stress models including Arrehenius model, four Ludwik family models (Johnson Cook, Modified Johnson-Cook, Hensel-Spittel, Sutton-Luo), two Voce family models (Ebrahimi et al., Razali et al.) and C-m models.

Temperature Dependent Plastic Deformation Behavior of AZ31 Magnesium Alloy in Uniaxial and Biaxial Compressions

2016 ◽  
Vol 725 ◽  
pp. 421-426 ◽  
Author(s):  
Ichiro Shimizu
Keyword(s):  
Elevated Temperature ◽  
Flow Stress ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Deformation Behavior ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Temperature Dependency ◽  
Stress Strain ◽  
Stress Strain Relation

Metal forming of magnesium alloys often performed at elevated temperature, because magnesium alloys exhibit peculiar stress-strain relation and inferior ductility compared to conventional metals at room temperature. In the present study, deformation behavior and formability of cast and extruded AZ31 magnesium alloys under uniaxial and biaxial compressions at room temperature and at elevated temperatures were investigated. The results revealed that the compressive stress-strain relation of AZ31 magnesium alloy changed not only with the initial texture but also with the deformation temperature. The temperature dependency of flow stress of the cast alloy was smaller than that of the extruded alloy probably because of less influence of pre-deformation. In addition, the influence of compressive deformation pattern upon flow stress of the extruded alloy remained even at elevated temperature to 523 K. The temperature dependency of compressive fracture was also discussed and it was found that the equi-biaxial condition improved the compressive formability at elevated temperatures.

Newly Developed Heat Resistant Magnesium Alloy by Thixomolding®

2005 ◽  
Vol 488-489 ◽  
pp. 287-290 ◽  
Author(s):  
Tadayoshi Tsukeda ◽  
Ken Saito ◽  
Mayumi Suzuki ◽  
Junichi Koike ◽  
Kouichi Maruyama
Keyword(s):  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Die Casting ◽  
The Other ◽  
Heat Resistant ◽  
Higher Temperature ◽  
Better Than

We compared the newly developed heat resistant magnesium alloy with conventional ones by Thixomolding® and aluminum alloy by die casting. Tensile properties at elevated temperatures of AXEJ6310 were equal to those of ADC12. In particular, elongation tendency of AXEJ6310 at higher temperature was better than those of the other alloys. Creep resistance of AXEJ6310 was larger than that of AE42 by almost 3 orders and smaller than that of ADC12 by almost 2 orders of magnitude. Fatigue limits at room temperature and 423K of AXEJ6310 was superior among conventional magnesium alloys.

scholarly journals Drawability Studies of Magnesium Alloy Sheets at Elevated Temperature / Badania Tłoczności Blach Ze Stopów Magnezu W Podwyższonej Temperaturze

2015 ◽  
Vol 60 (4) ◽  
pp. 2751-2756
Author(s):  
M. Hyrcza-Michalska ◽  
R. Kawalla ◽  
J. Dembińska
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Local Strain ◽  
Forming Limit ◽  
Material Technology ◽  
Roll Casting ◽  
University Of Technology ◽  
Metal Sheets ◽  
Twin Roll

Abstract The paper presents the results of a study of drawability of thin AZ31 magnesium alloy metal sheets. These studies are a continuation of experiences in presenting the characteristics of technological plasticity of strips made of magnesium alloy which have been cast between rolls in vertical and horizontal systems called ‘twin-roll casting’. In the context of previous experiments conducted at the Institute of Material Technology of the Silesian University of Technology in cooperation with the Technical University - Bergakademie Freiberg (Germany), drawability of these strips at elevated temperatures has been comprehensively defined while using forming limit curves. Due to low formability of magnesium alloys at ambient temperature, formability tests - including cup forming tests presented in this paper - have been carried out in heated dies at temperature range of 200°C to 350°C. A modern AutoGrid digital local strain analyzer has been used in the examinations and the method of image analysis of deformed coordination nets has been applied. Quantitative and qualitative impact of deformation temperature upon the drawability effects of AZ31 magnesium alloys products have been evaluated.

Influence of Processing Route on the Properties of Magnesium Alloys

2008 ◽  
Vol 141-143 ◽  
pp. 43-48 ◽  
Author(s):  
Frank Hagen ◽  
Norbert Hort ◽  
Hajo Dieringa ◽  
Karl Ulrich Kainer
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Processing Route ◽  
Chemical Compositions ◽  
Alloy Development ◽  
Heat Resistant ◽  
Eu Directive ◽  
Property Profile ◽  
The Eu

Magnesium alloys had gained an increasing interest in recent years due to their promising property profile for light weight constructions. They offer drastic advantages in weight reductions in automotive industries compared to steel or even aluminium. Therefore they can be used to decrease the emission of green house gases as requested by the EU directive for the reduction of CO2 emissions and moreover due to their recyclability they also help to fulfill the requirements from the EU directive regarding the end of life of vehicles. But still there are some limitations with regard to strength, mostly at elevated temperatures above 130 °C. To overcome these limitations alloy development as well as process optimization has to be done for further enhancement of the range of magnesium applications. This paper will show and discuss the property profiles of the standard magnesium alloy AZ91D compared to the recently developed, heat resistant magnesium alloy MRI153. The alloys have been processed using normal high pressure die casting (HPDC), New Rheocasting (NRC) and Thixomolding® (TM). As methods of investigation tensile and creep tests have been applied. The creep properties have been determined in the temperature range of 135-150 °C and loads of 50-85 MPa. All these trials have been accompanied by metallographic observations (light optical metallography, SEM) and density measurements to investigate the influence of the processing routes on microstructure and the porosity of the materials. It will be shown that the differences in the property profile of the chosen alloys are dependent on their different chemical compositions as well as on different microstructures that are obtained by the different processing routes. While in the case of AZ91D, TM is showing advantages compared to HPDC for room temperature applications, the NRC in combination with the heat resistant alloy leads to an improvement of creep rates by two orders of magnitudes.

Development of a Moderate Temperature Bending Process for Magnesium Alloy Extrusions

2005 ◽  
Vol 488-489 ◽  
pp. 477-482 ◽  
Author(s):  
Alan A. Luo ◽  
Anil K. Sachdev
Keyword(s):  
Magnesium Alloy ◽  
Design Of Experiments ◽  
Tensile Properties ◽  
Magnesium Alloys ◽  
Process Parameters ◽  
Weight Reduction ◽  
Elevated Temperatures ◽  
Key Factors ◽  
Automotive Components ◽  
Bending Process

An appropriate temperature (150-200°C) bending process has been developed for AZ31 and AM30 magnesium alloy tubes, and the optimum bending process parameters were obtained using a Design of Experiments (DOE) method. The development of this process was one of the key factors for use of magnesium tubes in automotive components for vehicle weight reduction. The tensile properties and deformation microstructure of magnesium alloys at elevated temperatures indicated that temperature of 150-200°C which might be suitable for hydroforming and other forming processes.

Study on Warm and Hot Tensile Deformation Behavior and Flow Stress of AZ31B Magnesium Alloy Sheet

2012 ◽  
Vol 488-489 ◽  
pp. 51-56 ◽  
Author(s):  
Wen Juan Li ◽  
Guo Qun Zhao ◽  
Xin Wu Ma ◽  
Jun Gao
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
Strain Rate ◽  
Magnesium Alloys ◽  
Alloy Sheet ◽  
True Stress ◽  
Stress Strain ◽  
Az31b Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31b Magnesium Alloy Sheet

The true stress-strain curves of AZ31B magnesium alloy sheet were obtained by using the uniaxial tensile tests at the temperature ranging from 50°Cto 300°C and the initial strain rate ranging from 0.001/s to 0.1/s. The influence of temperature and strain rate on the flow stress was analyzed. The results show that the flow stress decreases and the elongation in fracture increases with increasing temperature and decreasing strain rate，and the plastic performance is improved obviously. Through the analysis of the true stress-strain curves，a mathematical model of the flow stress was established based on an exponential form whose power is a quadratic function. All the coefficients in the model were fitted as functions of temperature and strain rate. The comparison of the calculated results with experimental data shows that the model established in this study can accurately reflect work hardening and strain softening effect of AZ31B magnesium alloys during the hot deformation. It can be used for the prediction of flow stress for AZ31B magnesium alloys under hot work conditions and numerical simulation of forming processes.

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