scholarly journals Effects of Second-Phase Particles on Microstructure Evolution in Mg-2Zn Based Magnesium Alloys during Annealing Treatment

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 777
Author(s):  
Yun Zhang ◽  
Haitao Jiang ◽  
Yujiao Wang ◽  
Zhe Xu
Keyword(s):  
Magnesium Alloy ◽  
Microstructure Evolution ◽  
Annealing Treatment ◽  
Salt Bath ◽  
Annealing Process ◽  
Second Phase ◽  
Recrystallization Behavior ◽  
Basal Texture ◽  
Static Recovery ◽  
Second Phase Particles

As an important fabrication process, annealing treatment is conducted to eliminate distortion in magnesium alloy sheets. Second-phase particles can provide nucleation sites for recrystallization grains, and the basal texture is related to the recrystallization behavior. Three experimental Mg-2Zn-based magnesium alloy sheets were investigated by the salt bath annealing process. Combined with variations in hardness softening, evolution of microstructure and basal texture, the effect of second-phase particles on microstructure evolution was analyzed. The results showed that the significant influence of size and distribution of second-phase particles on static recrystallization in magnesium alloy sheets was exhibited, which lead to the formation of two stages in the annealing process, combined with static recovery behavior. Second phase particles with coarse size were beneficial to recrystallization grains’ nucleation and increased recrystallization behavior in the initial stage of annealing. Second-phase particles with fine size inhibited recrystallization behavior and weakened the softening of hardness. The basal texture was weakened by second phase particles at the stage of recrystallization nucleation. The change in basal texture at the stage of grain growth was related to the size of second-phase particles. The regulation of basal texture enhancement can be envisioned by modifying second-phase particles.

Assessment of Microstructure and Wear Resistance of Friction Stir Processed Cast Mg-Al-Zn Magnesium Alloy

2015 ◽  
Vol 787 ◽  
pp. 442-447 ◽  
Author(s):  
R. Jayaraman ◽  
T. Balusamy ◽  
A.K. Lakshminarayanan
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Base Metal ◽  
Second Phase ◽  
Micro Hardness ◽  
Friction Stir ◽  
Second Phase Particles ◽  
Metal Wear ◽  
Pin On Disc ◽  
Cast Magnesium

Microstructure, micro hardness and wear resistance of friction stir processed cast magnesium alloy are investigated in this work. Image analysis is used to differentiate the amount of phases present in the base metal and friction stir processed regions. Hardness mapping indicates that the frictions stir processed region has 64 % increase in microhardness compared to the base metal. Wear resistance was evaluated using pin-on-disc testing and it is found that the friction stir processed region has superior wear resistance compared to the base metal. Fine grains with uniformly distributed second phase particles are the reasons for improved microhardness and wear resistance of friction stir processed region.

The Research on Hot Compression Mechanism of Light Alloy

2012 ◽  
Vol 204-208 ◽  
pp. 4079-4082
Author(s):  
Jun Wei Liu ◽  
Shi Qiang Lu ◽  
Xian Juan Dong ◽  
Xuan Xiao ◽  
Gui Fa Li
Keyword(s):  
Mechanical Property ◽  
Microstructure Evolution ◽  
Main Mechanism ◽  
Second Phase ◽  
Light Alloy ◽  
Two Stage ◽  
Second Stage ◽  
Second Phase Particles ◽  
Before And After ◽  
Compression Mechanism

In this research, in order to explore the main mechanism of direct and two-stage compression in as-cast light alloy, the mechanical property, microstructure evolution and the flowing of second phase particles were studied, before and after deformation. Then, the influence of the strain volume in first stage on flowing stress of the second stage deformation also was researched.

Volta potential of second phase particles in extruded AZ80 magnesium alloy

2006 ◽  
Vol 51 (17) ◽  
pp. 3551-3557 ◽  
Author(s):  
F. Andreatta ◽  
I. Apachitei ◽  
A.A. Kodentsov ◽  
J. Dzwonczyk ◽  
J. Duszczyk
Keyword(s):  
Magnesium Alloy ◽  
Second Phase ◽  
Volta Potential ◽  
Az80 Magnesium Alloy ◽  
Second Phase Particles

Microstructural evolution and corrosion behaviour of friction stir-processed QE22 magnesium alloy

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ankur Kumar ◽  
F. Khan MD ◽  
Sushanta Kumar Panigrahi ◽  
Gajanan P. Chaudhari
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Behaviour ◽  
Galvanic Corrosion ◽  
Point Of View ◽  
Second Phase ◽  
Friction Stir ◽  
Ultrafine Grained ◽  
Second Phase Particles ◽  
Before And After ◽  
The Matrix

Abstract Effect of microstructural changes after friction stir processing (FSP) on the corrosion behaviour of rare earth containing QE22 magnesium alloy is studied. FSP produced ultrafine-grained α-Mg matrix and refined the Mg12Nd precipitates whereas Mg12Nd2Ag precipitates got dissolved in the matrix. Although its hardness increased from 76 to 90 VHN, the FSPed alloy displayed inferior corrosion resistance in 3.5 wt% NaCl solution. This is attributed mainly to the iron contamination from FSP and presence of refined second phase particles which work as active cathodic sites. The role of distributed Mg12Nd precipitates before and after FSP is analysed from micro galvanic corrosion point of view.

Investigation of Nucleation Mechanisms of Recrystallization in Warm Rolled Fe3Al Base Alloys

2004 ◽  
Vol 467-470 ◽  
pp. 75-80 ◽  
Author(s):  
Joachim Konrad ◽  
Stefan Zaefferer ◽  
André Schneider
Keyword(s):  
Alloy Composition ◽  
Warm Rolling ◽  
Second Phase ◽  
Recrystallization Behavior ◽  
Small Particles ◽  
Second Phase Particles ◽  
Large Particles ◽  
Nucleation Mechanisms ◽  
The Matrix ◽  
Matrix Orientation

It has been shown in literature that the mechanical properties of Fe3Al base alloys are strongly dependent on the heat treatment subsequent to warm rolling. Therefore, the recrystallization behavior of 3 different hot and warm rolled and annealed Fe3Al-based alloys has been investigated. Two of these alloys contain different forms and amounts of second phase particles, while a pure binary alloy was taken as reference. All alloys develop a-(<110>||RD) and g-(<111>||ND) fiber bcc-type rolling and annealing textures, however, the amount of a- and g-fibers vary in dependence of the alloy composition. The current work presents the investigations on the nucleation process during annealing that has been studied by means of high resolution backscatter electron diffraction (EBSD) in the SEM. In particular the occurrence of orientation gradients in the deformed structure and their crystallographic relationship to the formation of new grains was investigated. It was shown, that small particles favor the a-fiber component by hindrance of the growth of new grains. In contrast, large particles lead to particle stimulated nucleation. This weakens the overall texture but does not randomize it since the orientation gradients around particles keep a relationship with the matrix orientation.

The nucleation of recrystallization at second phase particles in 7000 series deformed aluminum alloy

1995 ◽  
Vol 53 ◽  
pp. 528-529
Author(s):  
B. Hidalgo-Prada ◽  
J.J. Guilarte ◽  
S.Y. Paredes
Keyword(s):  
Aluminum Alloy ◽  
Microstructural Evolution ◽  
Second Phase ◽  
Recrystallization Behavior ◽  
Warm Deformation ◽  
Thermomechanical Process ◽  
Solution Anneal ◽  
Commercial Aluminum Alloy ◽  
Second Phase Particles

An investigation was carried out to determine the effect of a thermomechanical process (TMP) in the precipitation of dispersed second phase particles, and to assess the recrystallization behavior of a deformed ALCANVEN-7475 commercial aluminum alloy. The TMP included solution anneal treatment at Ts = 482°C for 3 hours, overaging at temperatures (To) in the range from 160 - 400°c for 1 to 30 hours, cold and warm deformation up to 90% reduction of thickness (RA) and recrystallization at Tr = 482 °C for 15 to 60 minutes.A Hitachi H-600 TEM operated at 100 KV was utilized to examine the microstructural evolution of the alloy leading to the nucleation of recrystallization as a consecuence of the previously described four steps TMP.It was determined that the nucleation of recrystallized grains is promoted by the presence of second phase particles with critical sizes between 0.5 and 1.0 μm.

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