Microstructure evolution and mechanical performance improvement of thin ZK61 magnesium alloy sheets subjected to cumulative cold rolling and intermediate annealing

The microstructure and material properties of AZ31 magnesium alloy are very sensitive to process parameters, which directly determine the service properties. To explore and understand the deformation behavior and the optimization of the deformation process, the microstructure evolution during equal channel angular pressing was predicted by using the DEFORM-3D software package at different temperature. To verify the finite element simulation results, the microstructure across the transverse direction of the billet was measured. The results show that the effects strain and deformation temperatures on the microstructure evolution of AZ31 magnesium during ECAP process are significant, and a good agreement between the predicted and experimental results was obtained, which confirmed that the derived dynamic recrystallization mathematical models can be successfully incorporated into the finite element model to predict the microstructure evolution of ECAP process for AZ31 magnesium.

Download Full-text

A new smoothed particle hydrodynamics non-Newtonian model for friction stir welding: Process modeling and simulation of microstructure evolution in a magnesium alloy

International Journal of Plasticity ◽

10.1016/j.ijplas.2013.02.013 ◽

2013 ◽

Vol 48 ◽

pp. 189-204 ◽

Cited By ~ 57

Author(s):

Wenxiao Pan ◽

Dongsheng Li ◽

Alexandre M. Tartakovsky ◽

Said Ahzi ◽

Marwan Khraisheh ◽

...

Keyword(s):

Friction Stir Welding ◽

Magnesium Alloy ◽

Modeling And Simulation ◽

Microstructure Evolution ◽

Process Modeling ◽

Smoothed Particle Hydrodynamics ◽

Welding Process ◽

Friction Stir ◽

Particle Hydrodynamics ◽

Smoothed Particle

Download Full-text

Improvement of Mechanical Performance of Bioresorbable Magnesium Alloy Coronary Artery Stents through Stent Pattern Redesign

Applied Sciences ◽

10.3390/app8122461 ◽

2018 ◽

Vol 8 (12) ◽

pp. 2461 ◽

Cited By ~ 3

Author(s):

Qian Wang ◽

Gang Fang ◽

Ying-Hong Zhao ◽

Jie Zhou

Keyword(s):

Magnesium Alloy ◽

Magnesium Alloys ◽

Design Pattern ◽

Design Patterns ◽

Mechanical Performance ◽

Three Dimensional ◽

Stent Design ◽

Stent Deformation ◽

Dimensional Finite Element ◽

Three Dimensional Finite Element

Optimized stent pattern design can effectively enhance the mechanical performance of magnesium alloy stents by adjusting strain distribution and evolution during stent deformation, thereby overcoming the limitations imposed by the intrinsic mechanical properties of magnesium alloys. In the present study, a new stent design pattern for magnesium alloys was proposed and compared to two existing stent design patterns. Measures of the mechanical performance of these three stents, including crimping and expanding deformability, radial scaffolding capacity, radial recoil and bending flexibility, were determined. Three-dimensional finite element (FE) models were built to predict the mechanical performance of the stents with the three design patterns and to assist in understanding the experimental results. The results showed that, overall, the stent with the new design pattern was superior to the stents based on the existing designs, though the expanding capacity of the newly designed stent still needed to be improved.

Download Full-text

Monotonic and Cyclic Characterization of Five Different Casting Processes on a Common Magnesium Alloy

ASME 2011 International Manufacturing Science and Engineering Conference, Volume 1 ◽

10.1115/msec2011-50173 ◽

2011 ◽

Cited By ~ 1

Author(s):

J. B. Jordon ◽

L. Wang

Keyword(s):

Magnesium Alloy ◽

Mechanical Performance ◽

Fatigue Crack Initiation ◽

Low Pressure ◽

Fatigue Tests ◽

Microstructure Characterization ◽

Cyclic Behavior ◽

Permanent Mold ◽

Az91 Magnesium Alloy ◽

Az91 Magnesium

The monotonic and cyclic behavior of five different casting processes for AZ91 magnesium alloy is evaluated through microstructure characterization and mechanical testing. A passenger car control arm was cast by squeeze cast, low pressure permanent mold, low pressure permanent mold-electricmagnetic-pump, T-mag, and ablation processes. Samples were cut from twelve locations of the control arm for microstructure characterization. The grain size, porosity fraction, and porosity size were measured via optical microscopy. Different types and sizes of defects were present in each type of casting processes. The mechanical behavior characterization included monotonic tension, and fully-reversed fatigue tests. Sources of fatigue crack initiation were quantified using scanning electron microscopy. For both monotonic and cyclic loading conditions, poor mechanical performance was directly linked to the presence of large pores, oxide films, and/or pore shrinkage clusters.

Download Full-text

Mechanical Properties Comparison of Different La Content in AZ91

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.620.67 ◽

2014 ◽

Vol 620 ◽

pp. 67-72 ◽

Cited By ~ 1

Author(s):

Yan Yan Zhang ◽

Chun Xia He ◽

Hang Song Yang ◽

Jian Xiu Liu

Keyword(s):

Magnesium Alloy ◽

Mechanical Performance ◽

Testing Machine ◽

Powder Metallurgy Method ◽

Az91 Magnesium Alloy ◽

Compression Performance ◽

Hardness Tester ◽

Mechanics Performance ◽

Tension And Compression ◽

Az91 Magnesium

In order to improve the comprehensive mechanics performance of AZ91 magnesium alloy which is used as car's material, the La element was added in AZ91 magnesium alloy and specimens was prepared by powder metallurgy method. The influence of La on microstructure, hardness and compression performance of AZ91 a magnesium alloy specimen was studied using metallographic electronic microscope, hardness tester, universal tension and compression testing machine. The experimental results show that when amount of La's addition is 1.2%, its mechanical performance is best, hardness is 67.1 HV, compressive strength is 115.8 MPa, increased respectively by 20.0% and 29.5% compared the AZ91 magnesium alloy substrate, and the grain refinement effect of AZ91 magnesium alloy is the best at this time.

Download Full-text