Low-Temperature Properties of Cast and Wrought Magnesium Alloys

2009 ◽  
pp. 51-51-10
Author(s):  
Raymond W. Fenn
Keyword(s):  
Low Temperature ◽  
Magnesium Alloys

Modelling of Flow Behaviour of Magnesium Alloys

2016 ◽  
Vol 716 ◽  
pp. 360-367
Author(s):  
Carlo Bruni
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Low Temperature ◽  
Magnesium Alloys ◽  
Flow Curve ◽  
Flow Behaviour ◽  
Temperature Deformation ◽  
Flow Curves ◽  
High Deformation ◽  
Modelling Approach

The present investigation aims at studying the flow behaviour of magnesium alloys under different conditions in terms of temperature, deformation velocities and deformation. The modelling approach was based on a proposed equation to model the shape of each flow curve through different variables. The modelled flow curves were subsequently compared with those obtained with experiments. The models were validated on flow curves not used in the building stage. It was observed that, for low temperature values, high deformation velocities and deformations the final part of the flow curve has to be adapted in order to be adopted for the description of material in the numerical simulation. In other words it needs to be extrapolated. Also for the high temperature, the flow softening has to be limited in order to allow the extrapolation queue required for elevated deformations. The deformation value at which the extrapolation can start can be predicted with an other proposed equation detailed in the paper.

Low Temperature Superplasticity of Hydrostatically Extruded Mg-Al-Zn Alloys

2012 ◽  
Vol 735 ◽  
pp. 307-315 ◽  
Author(s):  
Jose Victoria-Hernandez ◽  
David Hernandez-Silva ◽  
Jan Bohlen ◽  
Sang Bong Yi ◽  
Dietmar Letzig
Keyword(s):  
Low Temperature ◽  
Magnesium Alloys ◽  
Deformation Behavior ◽  
Superplastic Behavior ◽  
Homogeneous Microstructure ◽  
Fine Grained ◽  
Dynamic Recrystallisation ◽  
Zn Alloys ◽  
Temperature Dynamic

In this work, the superplastic behavior of AZ31, AZ61 and AZ80 magnesium alloys was investigated. The alloys were hydrostatically extruded at only 150 °C to get fine grained microstructures (−2, 10−3and 10−4s−1. It was found that all alloys exhibited superplasticity at 200 °C, 175 °C and 225 °C for AZ31, AZ61 and AZ80 alloys, respectively. Low temperature dynamic recrystallisation played an important role for generating a finer and homogeneous microstructure during testing which enhances the deformation behavior of the alloys at these temperatures.

Low-temperature electrical resistivity and magnetic susceptibility of dilute Mg–Ce alloys

1970 ◽  
Vol 48 (11) ◽  
pp. 1283-1287 ◽  
Author(s):  
F. T. Hedgcock ◽  
B. Petrie
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Fermi Level ◽  
Magnesium Alloys ◽  
Conduction Electron ◽  
Room Temperature ◽  
Impurity Scattering ◽  
Cerium Ion ◽  
Normal Potential

The electrical resistivity of a series of magnesium alloys containing from 300 to 1041 parts per million of gadolinium has been measured from 4.2 °K to room temperature. No low-temperature anomalies have been observed and it is found that Matthiessen's rule is obeyed extremely well over the whole temperature range studied. The electrical resistivity and magnetic susceptibility measurements indicate that the cerium ion in magnesium is in a triply ionized state, and that the contribution to the resistivity can be almost totally accounted for by assuming normal potential impurity scattering. This suggests that the f level of cerium in magnesium lies well below the fermi level of magnesium and that there is very little s–f mixing between the f level of cerium of the conduction electron states of magnesium.

Low-Temperature Superplasticity in Microcrystalline ZK60 and AZ91 Magnesium Alloys Processed by ECAP

Magnesium ◽  
2005 ◽  
pp. 409-414
Author(s):  
V. N. Chuvil'deev ◽  
T. G. Nieh ◽  
M. Yu. Gryaznov ◽  
A. N. Sysoev ◽  
V. I. Kopylov
Keyword(s):  
Low Temperature ◽  
Magnesium Alloys ◽  
Az91 Magnesium
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