Self-Healing Behavior of Sodium Polyacrylate-Hydroxyapatite Coatings on Biodegradable Magnesium Alloy

CORROSION ◽  
10.5006/2509 ◽  
2017 ◽  
Vol 73 (12) ◽  
pp. 1461-1477 ◽  
Author(s):  
Sachiko Hiromoto ◽  
Kotaro Doi
Keyword(s):  
Magnesium Alloy ◽  
Sodium Polyacrylate ◽  
Self Healing ◽  
Hydroxyapatite Coatings ◽  
Biodegradable Magnesium

scholarly journals Fatigue Properties of AZ31B Magnesium Alloy Processed by Equal-Channel Angular Pressing

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1191
Author(s):  
Ryuichi Yamada ◽  
Shoichiro Yoshihara ◽  
Yasumi Ito
Keyword(s):  
Magnesium Alloy ◽  
Equal Channel Angular Pressing ◽  
Low Cycle Fatigue ◽  
Annealed Sample ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Angular Pressing ◽  
Fundamental Research ◽  
Number Of Cycles ◽  
Biodegradable Magnesium

A stent is employed to expand a narrowed tubular organ, such as a blood vessel. However, the persistent presence of a stainless steel stent yields several problems of late thrombosis, restenosis and chronic inflammation reactions. Biodegradable magnesium stents have been introduced to solve these problems. However, magnesium-based alloys suffer from poor ductility and lower than desired fatigue performance. There is still a huge demand for further research on new alloys and stent designs. Then, as fundamental research for this, AZ31 B magnesium alloy has been investigated for the effect of equal-channel angular pressing on the fatigue properties. ECAP was conducted for one pass and eight passes at 300 °C using a die with a channel angle of 90°. An annealed sample and ECAP sample of AZ31 B magnesium alloy were subjected to tensile and fatigue tests. As a result of the tensile test, strength in the ECAP (one pass) sample was higher than in the annealed sample. As a result of the fatigue test, at stress amplitude σa = 100 MPa, the number of cycles to failure was largest in the annealed sample, medium in the ECAP (one pass) sample and lowest in the ECAP (eight passes) sample. It was suggested that the small low cycle fatigue life of the ECAP (eight passes) sample is attributable to severe plastic deformation.

Damage evolution of biodegradable magnesium alloy stent based on configurational forces

2021 ◽  
Vol 122 ◽  
pp. 110443
Author(s):  
Rong Wang ◽  
Zhongbo Yuan ◽  
Qun Li ◽  
Bo Yang ◽  
Hong Zuo
Keyword(s):  
Magnesium Alloy ◽  
Damage Evolution ◽  
Configurational Forces ◽  
Biodegradable Magnesium
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