Texture, Microstructure and Strain Sensibility in Compressed Magnesium Alloys

2005 ◽  
Vol 488-489 ◽  
pp. 185-188 ◽  
Author(s):  
Ping Yang ◽  
Zude Zhao ◽  
Li Meng ◽  
Xueping Ren ◽  
Shao Dong Huang
Keyword(s):  
Plane Strain ◽  
Magnesium Alloys ◽  
Deformation Process ◽  
Az31 Alloy ◽  
Deformation Mechanisms ◽  
Strain Condition ◽  
Zk60 Alloy ◽  
Initial Texture ◽  
Kinetics Of ◽  
External Strain

Depending on its initial texture and external strain condition differences in deformation mechanisms, kinetics of dynamic recrystallization or even superplastic behaviors may emerge in magnesium alloys leading to distinct microstructure and texture evolutions. When imposed strain condition is altered, e.g. from plane strain compression to rolling or uniaxial compression, the deformation anisotropy will decrease in different rates and basal slip and {1012} twinning will dominate deformation process. This work examines this strain sensibility by inspecting the σ-ε curves, microstructures and textures in a quasi plane-strain compressed ZK60 alloy and compares the results with those of AZ31 alloy compressed in channel die.

scholarly journals In-situ study of the corrosion process of biodegradable magnesium alloys

2021 ◽  
pp. 18-25
Author(s):  
P. N. Myagkikh ◽  
◽  
E. D. Merson ◽  
V. A. Poluyanov ◽  
D. L. Merson ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Magnesium Alloys ◽  
Human Body ◽  
Corrosion Damage ◽  
Az31 Alloy ◽  
Corrosion Process ◽  
Ex Situ ◽  
Zk60 Alloy ◽  
In Situ Methods

The interest in magnesium and its alloys considerably increases in recent years. These materials have a unique complex of properties: light-weight and strength make magnesium alloys promising structural materials for the aircraft industry and space application, and ability to reabsorb in vivo conditions and good biocompatibility allow producing biodegradable surgical implants of magnesium alloys, which can resorb in a human body without detriment to health. The materials for such demanding applications require detailed investigation of their properties, such as corrosion, including the kinetics of corrosion rate and staging of corrosion damage on the surface. To obtain a full view of the corrosion process, in addition to common ex-situ methods such as the corrosion rate evaluating using the weight loss method and the morphology corrosion damage investigation by optical or confocal laser scanning microscopy (CLSM), it is important to use modern in-situ methods. In-situ methods allow obtaining data immediately during the experiment and not after its completion. The authors carried out a comprehensive study of the corrosion process of the commercial ZK60 and AZ31 magnesium alloys in the simulated human-body environment (temperature, corrosion media composition, circulation of corrosion media) using in-situ methods, including hydrogen evolution corrosion rate evaluating and video-observation of a sample surface. The results show that AZ31 alloy is more corrosion-resistant than ZK60 alloy. Moreover, AZ31 alloy is prone to filiform surface corrosion, and ZK60 alloy exhibits severe pitting corrosion. Based on the comparison of the data obtained by in-situ and ex-situ methods, the authors concluded on their main differences and features.

An Investigation of the Dynamic Recrystallisation Behaviour of Magnesium AZ31 Alloy at 450°C Using Plane Strain Compression Testing as a Tool

2012 ◽  
Vol 715-716 ◽  
pp. 164-169
Author(s):  
Bradley P. Wynne ◽  
R. Bhattacharya ◽  
Bruce Davis ◽  
W.M. Rainforth
Keyword(s):  
Strain Rate ◽  
Plane Strain ◽  
Testing Machine ◽  
Az31 Alloy ◽  
Plane Strain Compression ◽  
Strain Rates ◽  
Basal Texture ◽  
Magnesium Az31 ◽  
Dynamic Recrystallisation ◽  
Double Hit

The dynamic recrystallisation (DRX) behaviour of magnesium AZ31 is investigated using a plane strain compression (PSC) testing machine at 450°C. The variables included strain rate, double hit including intermittent anneal and double hits with different strain rate at each hit. The alloy shows higher peak stress and strain with increasing strain rates. Predominant basal texture with different intensities are observed at different strain rates. The annealing treatment between double tests leads to strong basal texture. Reversal of strain rate during double hit results in similar flow curves. This shows that in AZ31 alloy, DRX mechanism is independent of the initial microstructure and only depends on the test condition viz. temperature, strain rate and total equivalent strain.

Texture Formation Behaviors in AZ80 Magnesium Alloy during High-Temperature Plane Strain Compression

2015 ◽  
Vol 1110 ◽  
pp. 152-157
Author(s):  
Kwon Hoo Kim ◽  
Jun Ho Choi ◽  
Kwang Il Hwang ◽  
Han Sang Kwon ◽  
Kazuto Okayasu ◽  
...  
Keyword(s):  
High Temperature ◽  
Magnesium Alloy ◽  
Plane Strain ◽  
Plane Strain Compression ◽  
Temperature Deformation ◽  
Deformation Condition ◽  
Pole Density ◽  
Texture Formation ◽  
Az80 Magnesium Alloy ◽  
Initial Texture

The behavior of texture formation during high-temperature deformation in AZ80 magnesium alloy is investigated. Three kinds of specimens were machined out from rolled plates. The plane strain compression tests were conducted at various deformation conditions – temperature, strain and strain rate. After compression deformation, texture measurement was carried out on the mid-plane section parallel to the compression direction by the Schulz reflection method and EBSD measurement. The maximum values of the flow stress are observed in all the cases at the true stress – true strain curve for three type of specimens. It is found that the main component of texture and the accumulation of pole density vary depending on deformation condition and initial texture. Six kinds of crystal orientation components have been observed after deformation in total. (0001)<10-10> is formed regardless of the initial texture.

The Comparison of the Loess Mechanical Properties under Plane Strain and Conventional Triaxial Experiments

2014 ◽  
Vol 919-921 ◽  
pp. 791-794
Author(s):  
Lin Ma
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Plane Strain ◽  
Confining Pressure ◽  
Test Method ◽  
The Other ◽  
Strain Condition ◽  
Plane Strain Problem ◽  
Plain Strain ◽  
The Impact

Plane strain problem is currently prevalent in the loess engineering. However, this problem still using conventional triaxial test method for processing. So the paper conducted the plain strain test, analyze differences in plane strain experiments with conventional triaxial experiments under different moisture content and confining pressure. Research shows two points, the first one is the impact on the strength of the soil is more under moisture content than confining pressure, the other is that the soil strength under the plane strain condition is significantly greater than conventional triaxial conditions. It shows that the results were conservative under the plane strain problem at past. It played a certain role in guiding the engineering.

Dissolution mechanisms and kinetics of δ phase in an aged Ni-based superalloy in hot deformation process

2018 ◽  
Vol 156 ◽  
pp. 262-271 ◽  
Author(s):  
Dao-Guang He ◽  
Y.C. Lin ◽  
Xing-You Jiang ◽  
Liang-Xing Yin ◽  
Li-Hua Wang ◽  
...  
Keyword(s):  
Hot Deformation ◽  
Deformation Process ◽  
Δ Phase ◽  
Kinetics Of

scholarly journals The Kinetics of Plastic Flow

1980 ◽  
Vol 35 (11) ◽  
pp. 1152-1161
Author(s):  
B. Faucher ◽  
A. S. Krausz
Keyword(s):  
Plastic Flow ◽  
Activation Parameters ◽  
Initial Step ◽  
Deformation Mechanisms ◽  
Plastic Strain Rate ◽  
Qualitative Comparison ◽  
Deformation Kinetics ◽  
Functional Forms ◽  
Kinetics Of

Abstract The plastic flow associated with the three main methods of combining deformation mechanisms is described in terms of deformation kinetics. It is shown that the determination of the deformation kinetics as the initial step in the analysis is indispensable to the establishment of the activation parameters in functional forms. To this purpose, the effects of stress and temperature on the plastic strain rate are determined for three types of combined mechanisms, and qualitative comparison with experimental results is presented.

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