S.M. Yin C.H. Wang Y.D. Diao S.D. Wu S.X. Li
材料科学技术（英文）
The yield asymmetry between compression and tension of magnesium alloy Mg-3Al-1Zn (AZ31) with different grain sizes and textures has been studied by tensile and compressive testing of as-cast, as-extruded and equal channel angular pressed (ECAPed) specimens. The significant yield asymmetry (the rati...
关键词:
Magnesium alloys
Wan Peng
,
Tan Lili
,
Yang Ke
材料科学技术（英文）
doi:10.1016/j.jmst.2016.05.003
Magnesium (Mg) and its alloys as a novel kind of biodegradable material have attracted much fundamental research and valuable exploration to develop its clinical application. Mg alloys degrade too fast at the early stage after implantation, thus commonly leading to some problems such as osteolysis, early fast mechanical loss, hydric bubble aggregation, gap formation between the implants and the tissue. Surface modification is one of the effective methods to control the degradation property of Mg alloys to adapt to the need of organism. Some coatings with bioactive elements have been developed, especially for the micro-arc oxidation coating, which has high adhesion strength and can be added with Ca, P, and Sr elements. Chemical deposition coating including bio-mimetic deposition coating, electro-deposition coating and chemical conversion coating can provide good anticorrosion property as well as better bioactivity with higher Ca and P content in the coating. From the biodegradation study, it can be seen that surface coating protected the Mg alloys at the early stage providing the Mg alloy substrate with lower degradation rate. The biocompatibility study showed that the surface modification could provide the cell and tissue stable and weak alkaline surface micro-environment adapting to the cell adhesion and tissue growth. The surface modification also decreased the mechanical loss at the early stage adapting to the load-bearing requirement at this stage. From the interface strength between Mg alloys implants and the surrounding tissue study, it can be seen that the surface modification improved the bio-adhesion of Mg alloys with the surrounding tissue, which is believed to be contributed to the tissue adaptability of the surface modification. Therefore, the surface modification adapts the biodegradable magnesium alloys to the need of biodegradation, biocompatibility and mechanical loss property. For the different clinical application, different surface modification methods can be provided to adapt to the clinical requirements for the Mg alloy implants.
关键词:
Bio-adaptability
,
Coating
,
Biodegradable
,
Magnesium alloys
,
Orthopedic implants
Ruiling Jia
材料科学技术（英文）
The influence of Al content on the Mg-Al alloys corrosion performance during sodium chloride induced atmospheric corrosion has been studied. It was found that the corrosion rate of three Mg-Al alloys was accelerated with increasing Al content. The poor corrosion resistance was attributed to the galv...
关键词:
Magnesium alloys
Z. Yang
,
J.P. Li
,
J.X. Zhang
,
G.W.Lorimer
,
J. Robson
,
null
,
null
,
null
,
null
金属学报(英文版)
The current research and development of magnesium alloys is summarized. Several aspects of magnesium alloys are described: cast Mg alloy, wrought Mg alloy, and novel processing. The subjects are discussed individually and recommendations for further study are listed in the final section....
关键词:
Magnesium alloys
,
null
,
null
Mingtao WANG
,
B.Y.Zong
,
Gang WANG
材料科学技术（英文）
A model has been established to simulate the realistic spatio-temporal microstructure evolution in recrystallization of a magnesium alloy using the phase field approach. A set of rules have been proposed to decide the real physical value of all parameters in the model. The thermodynamic software THE...
关键词:
Static recrystallization
,
null
,
null
,
null
Qingwei DAI
金属学报(英文版)
A pyramid sheet has been used in experiments and three-dimensional finite element simulation to study the edge cracks and effects of width on AZ31 sheet under rolling. Results show that the edge cracks of Mg sheet comply with the Normalized Crockroft & Latham theory. It can be predicted by D...
关键词:
Finite elements method
,
镁合金
,
轧制
,
边裂
M.-X.Zhang
,
P.M.Kelly
,
M.Qian
,
J.A.Taylor
材料科学技术（英文）
An edge-to-edge matching model has been used to analyze the crystallographic features between Mg matrix and three commonly accepted heterogeneous nucleants for Mg grains, Al4C3, Al2CO and Al8(Mn, Fe)5. The model has predicted that Al2CO is the most effective nucleant of the three compounds assessed ...
关键词:
Crystallography
,
null
,
null
,
null
,
null
