scholarly journals Magnesium-Based Bioactive Composites Processed at Room Temperature

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2609 ◽  
Author(s):  
Moara M. Castro ◽  
Debora R. Lopes ◽  
Renata B. Soares ◽  
Diogo M. M. dos Santos ◽  
Eduardo H. M. Nunes ◽  
...  
Keyword(s):  
Bioactive Glass ◽  
Room Temperature ◽  
High Pressure Torsion ◽  
Pure Magnesium ◽  
High Cell ◽  
Az91 Magnesium Alloy ◽  
Hydroxyapatite Composite ◽  
Az91 Magnesium ◽  
Bioactive Composites ◽  
Hank’S Solution

Hydroxyapatite and bioactive glass particles were added to pure magnesium and an AZ91 magnesium alloy and then consolidated into disc-shaped samples at room temperature using high-pressure torsion (HPT). The bioactive particles appeared well-dispersed in the metal matrix after multiple turns of HPT. Full consolidation was attained using pure magnesium, but the center of the AZ91 disc failed to fully consolidate even after 50 turns. The magnesium-hydroxyapatite composite displayed an ultimate tensile strength above 150 MPa, high cell viability, and a decreasing rate of corrosion during immersion in Hank’s solution. The composites produced with bioactive glass particles exhibited the formation of calcium phosphate after 2 h of immersion in Hank’s solution and there was rapid corrosion in these materials.

Effect of Ca and Sr Content on Elevated Temperatures Mechanical Properties of a Cast AZ91 Magnesium Alloy

2007 ◽  
Vol 26-28 ◽  
pp. 141-144
Author(s):  
Ippei Takeuchi ◽  
Kinji Hirai ◽  
Yorinobu Takigawa ◽  
Tokuteru Uesugi ◽  
Kenji Higashi
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Creep Resistance ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Tensile Tests ◽  
Az91 Magnesium Alloy ◽  
Additional Amount ◽  
Az91 Magnesium ◽  
Second Phases

The effect of Ca and Sr content on the microstructure and mechanical properties of a cast AZ91 magnesium alloy is investigated. Ca and Sr additions in AZ91 magnesium alloy are expected high creep resistance. The microstructure of the alloy exhibits the dendritic α-matrix and the second-phases forming networks on the grain boundary. Tensile tests at elevated temperatures between 448 and 523K reveal that the creep resistance was improved with increasing the additional amount of Ca, especially more than 1.0wt%. From the perspective of grain refinement effect, it is expected that the additions of Ca and Sr to AZ91 magnesium alloy not only improve creep resistance but also improve mechanical properties at room temperature.

scholarly journals Corrosion Behavior in Hank's Solution of a Magnesium–Hydroxyapatite Composite Processed by High‐Pressure Torsion

2020 ◽  
Vol 22 (12) ◽  
pp. 2000765 ◽  
Author(s):  
Debora Lopes ◽  
Renata B. Soares ◽  
Moara M. Castro ◽  
Roberto B. Figueiredo ◽  
Terence G. Langdon ◽  
...  
Keyword(s):  
High Pressure ◽  
Corrosion Behavior ◽  
High Pressure Torsion ◽  
Hydroxyapatite Composite ◽  
Hank’S Solution

SRET Evaluation of the Corrosion Behavior of Thixocast AZ91 Magnesium Alloy in Dilute NaCl Solution at Room Temperature

2019 ◽  
Vol 3 (31) ◽  
pp. 295-311 ◽  
Author(s):  
Shize Jin ◽  
Edward Ghali ◽  
Carsten Blawert ◽  
Wolfgang Dietzel
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Behavior ◽  
Room Temperature ◽  
Nacl Solution ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium

Superplastic behaviour of AZ91 magnesium alloy processed by high-pressure torsion

2015 ◽  
Vol 637 ◽  
pp. 1-11 ◽  
Author(s):  
Ahmed S.J. Al-Zubaydi ◽  
Alexander P. Zhilyaev ◽  
Shun C. Wang ◽  
Philippa A.S. Reed
Keyword(s):  
High Pressure ◽  
Magnesium Alloy ◽  
High Pressure Torsion ◽  
Az91 Magnesium Alloy ◽  
Superplastic Behaviour ◽  
Az91 Magnesium

scholarly journals Using High-Pressure Torsion to Achieve Superplasticity in an AZ91 Magnesium Alloy

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 681 ◽  
Author(s):  
Roberto B. Figueiredo ◽  
Terence G. Langdon
Keyword(s):  
High Pressure ◽  
Magnesium Alloy ◽  
Grain Boundary ◽  
High Pressure Torsion ◽  
Grain Boundary Sliding ◽  
Grain Structure ◽  
Strain Rates ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium ◽  
Boundary Sliding

An AZ91 magnesium alloy (Mg-9%, Al-1% Zn) was processed by high-pressure torsion (HPT) after solution-heat treatment. Tensile tests were carried out at 423, 523, and 623 K in the strain rate range of 10−5−10−1 s−1 to evaluate the occurrence of superplasticity. Results showed that HPT processing refined the grain structure in the alloy, and grain sizes smaller than 10 µm were retained up to 623 K. Superplastic elongations were observed at low strain rates at 423 K and at all strain rates at 523 K. An examination of the experiment data showed good agreement with the theoretical prediction for grain-boundary sliding, the rate-controlling mechanism for superplasticity. Elongations in the range of 300–400% were observed at 623 K, attributed to a combination of grain-boundary-sliding and dislocation-climb mechanisms.

Dynamic Forming of AZ91 Magnesium Alloy Using Explosive Energy

2011 ◽  
Vol 673 ◽  
pp. 297-300 ◽  
Author(s):  
Li Qun Ruan
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Room Temperature ◽  
Cold Working ◽  
Az91 Magnesium Alloy ◽  
Cross Sectional ◽  
Explosive Energy ◽  
Az91 Magnesium ◽  
Forming Methods ◽  
Magnesium Block

Magnesium alloys are poor in ductility at room temperature and it is known that the cold working is very difficult. Therefore, the development of forming methods, especially at normal temperature, is highly expected [1]. In this paper, AZ91 magnesium block were accelerated more than 100 m/s and the magnesium alloy was well deformed into the die gap. The cross-sectional microstructure was characterized and the deformation of the magnesium was discussed.

AZ91 Magnesium Alloy/Porous Hydroxyapatite Composite for Potential Application in Bone Repair

2016 ◽  
Vol 32 (9) ◽  
pp. 858-864 ◽  
Author(s):  
Bin Chen ◽  
Kai-Yang Yin ◽  
Tian-Feng Lu ◽  
Bing-Yi Sun ◽  
Qing Dong ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Potential Application ◽  
Bone Repair ◽  
Az91 Magnesium Alloy ◽  
Porous Hydroxyapatite ◽  
Hydroxyapatite Composite ◽  
Az91 Magnesium

Mechanical Properties of Twin Roll Cast AZ91 Magnesium Alloy at Room Temperature

2007 ◽  
Vol 26-28 ◽  
pp. 145-148 ◽  
Author(s):  
Shu Hei Uchida ◽  
Ippei Takeuchi ◽  
Gentaro Gonda ◽  
Kinji Hirai ◽  
Tokuteru Uesugi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Room Temperature ◽  
Cast Alloy ◽  
Casting Process ◽  
Az91 Magnesium Alloy ◽  
Die Cast ◽  
Az91 Magnesium ◽  
Twin Roll Cast ◽  
Twin Roll

Twin roll casting process combines casting and hot rolling into a single process. In this study, mechanical properties at room temperature and microstructure of the twin roll cast AZ91 magnesium alloy are investigated. The alloy exhibited a good combination of high ultimate strength of 343MPa, yield stress of 224MPa and elongation to failure of 13%. The mechanical property was very excellent compared with AZ91 die-cast alloy. EPMA analysis reveals that the Al concentration in Mg matrix is higher in twin roll cast alloy than that in die-cast alloy. This high Al concentration must be the origin of the good mechanical properties of twin roll cast alloy at room temperature.

Mechanical Properties of Twin Roll Cast AZ91 Magnesium Alloy at Room Temperature

2007 ◽  
pp. 145-148 ◽  
Author(s):  
Shu Hei Uchida ◽  
Ippei Takeuchi ◽  
Gentaro Gonda ◽  
Kinji Hirai ◽  
Tokuteru Uesugi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Room Temperature ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium ◽  
Twin Roll Cast ◽  
Twin Roll
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