The Microstructure Evolution and Twinning Characterization of AZ31 Mg Alloy Sheet in Low-Temperature Bending Process

2013 ◽  
Vol 690-693 ◽  
pp. 16-19
Author(s):  
Jun Wei Liu ◽  
Shi Qiang Lu ◽  
Ke Lu Wang ◽  
Gui Fa Li ◽  
Xuan Xiao
Keyword(s):  
Low Temperature ◽  
Microstructure Evolution ◽  
Room Temperature ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Az31 Mg Alloy ◽  
Bending Process ◽  
Hot Rolled ◽  
The Relationship

The relationship among stress, cavities and twinning in the room-temperature bending process of hot-rolled AZ31 Mg alloy sheet was researched. It can be seen that the mount of twins which was tightly affected by stress value increases with the distance to press point. Otherwise, the cavities and twinning which seem totally independent, in fact affect with each other. Some cavities were hindered by twins and can not further grow up. Then, the relationship between slip and twinning was also roughly discussed. The dislocation lines in twins can be thought to release the stress focus and were beneficial for deformation.

Damage analysis of hot-rolled AZ31 Mg alloy sheet during uniaxial tensile testing under different loading directions

2018 ◽  
Vol 710 ◽  
pp. 289-299 ◽  
Author(s):  
Weiying Huang ◽  
Qinghuan Huo ◽  
Zhengwu Fang ◽  
Zhenyu Xiao ◽  
Yong Yin ◽  
...  
Keyword(s):  
Tensile Testing ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Uniaxial Tensile ◽  
Damage Analysis ◽  
Uniaxial Tensile Testing ◽  
Az31 Mg Alloy ◽  
Hot Rolled

Influence of stress state on microstructure evolution of AZ31 Mg alloy rolled sheet during deformation at room temperature

2018 ◽  
Vol 715 ◽  
pp. 379-388 ◽  
Author(s):  
Dabiao Xia ◽  
Guangsheng Huang ◽  
Qianyuan Deng ◽  
Bin Jiang ◽  
Shuaishuai Liu ◽  
...  
Keyword(s):  
Stress State ◽  
Microstructure Evolution ◽  
Room Temperature ◽  
Mg Alloy ◽  
Rolled Sheet ◽  
Az31 Mg Alloy

Processing by Pulsed Laser Deposition and Structural, Morphological and Chemical Characterization of Bi-Pb-Sr-Ca-Cu-O and Bi-Pb-Sb-Sr-Ca-Cu-O Thin Films

2010 ◽  
Vol 75 ◽  
pp. 202-207
Author(s):  
Victor Ríos ◽  
Elvia Díaz-Valdés ◽  
Jorge Ricardo Aguilar ◽  
T.G. Kryshtab ◽  
Ciro Falcony
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Chemical Characterization ◽  
Laser Deposition ◽  
Nominal Composition ◽  
Deposition Parameters ◽  
The Relationship

Bi-Pb-Sr-Ca-Cu-O (BPSCCO) and Bi-Pb-Sb-Sr-Ca-Cu-O (BPSSCCO) thin films were grown on MgO single crystal substrates by pulsed laser deposition. The deposition was carried out at room temperature during 90 minutes. A Nd:YAG excimer laser ( = 355 nm) with a 2 J/pulse energy density operated at 30 Hz was used. The distance between the target and substrate was kept constant at 4,5 cm. Nominal composition of the targets was Bi1,6Pb0,4Sr2Ca2Cu3O and Bi1,6Pb0,4Sb0,1Sr2Ca2Cu3OSuperconducting targets were prepared following a state solid reaction. As-grown films were annealed at different conditions. As-grown and annealed films were characterized by XRD, FTIR, and SEM. The films were prepared applying an experimental design. The relationship among deposition parameters and their effect on the formation of superconducting Bi-system crystalline phases was studied.

Characterization of Microstructure and Composition of Plasma Electrolytic Oxide Film Formed on AZ31 Mg Alloy

2020 ◽  
Vol 860 ◽  
pp. 213-217
Author(s):  
Efrina Hidayati ◽  
Anawati Anawati
Keyword(s):  
Degradation Rate ◽  
High Surface ◽  
Mg Alloy ◽  
Constant Current ◽  
X Ray Diffraction ◽  
Time Curve ◽  
Biodegradable Implant ◽  
Az31 Mg Alloy ◽  
Plasma Electrolytic

Magnesium alloy has been widely investigated as a biodegradable implant material owing to its unique properties to degrade spontaneously in human body fluid without causing toxicity. However, the degradation rate needs to be controlled. An effective way to lower down the degradation rate of Mg alloy is by coating with plasma electrolytic oxidation (PEO) technique. In this research, the microstructure and mechanical hardness of the PEO film formed on AZ31 were investigated. The film was prepared under a constant current of 400 A/m2 in the Na3PO4 solution at 30°C. The voltage-time curve showed an immediate increase of current during the first 25 s before reaching a steady-state voltage of 150 V. The spark discharge revealed as white micro discharges. The film formed for 3 min exhibited a high surface roughness with a large variety of thickness in the range of 1-20 µm. The film contained pores and cracks. The big pores with diameter size 10-20 µm were formed as a result of gas entrapment, while the small pores with a radius of 1-3 µm were associated with the discharge tunnel during the PEO process. The X-ray diffraction pattern indicated that the film composed of crystalline Mg3(PO4)2.

Determination of Active Slip/Twinning Modes in AZ31 Mg Alloy Near Room Temperature

2007 ◽  
Vol 16 (3) ◽  
pp. 321-326 ◽  
Author(s):  
Hualong Li ◽  
Emilie Hsu ◽  
Jerzy Szpunar ◽  
Ravi Verma ◽  
Jon. T. Carter
Keyword(s):  
Room Temperature ◽  
Mg Alloy ◽  
Az31 Mg Alloy ◽  
Active Slip

Microstructural characterization of oxide layers in CaO added AZ31 Mg alloy

2017 ◽  
Vol 714 ◽  
pp. 397-408 ◽  
Author(s):  
Taeg Woo Lee ◽  
Hyun Woong Park ◽  
Hyunkyu Lim ◽  
Shae K. Kim ◽  
Sung Hwan Lim
Keyword(s):  
Microstructural Characterization ◽  
Mg Alloy ◽  
Oxide Layers ◽  
Az31 Mg Alloy
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