scholarly journals Role of second phase particles and solute atoms in the grain refinement of a 7475 alloy sheet.

1991 ◽  
Vol 41 (5) ◽  
pp. 331-337 ◽  
Author(s):  
Hideo YOSHIDA
Keyword(s):  
Grain Refinement ◽  
Alloy Sheet ◽  
Second Phase ◽  
Second Phase Particles ◽  
Solute Atoms

scholarly journals Grain Refinement by Second Phase Particles under Applied Stress in ZK60 Mg Alloy with Y through Phase Field Simulation

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1903 ◽  
Author(s):  
Yuhao Song ◽  
Mingtao Wang ◽  
Yaping Zong ◽  
Ri He ◽  
Jianfeng Jin
Keyword(s):  
Grain Refinement ◽  
Applied Stress ◽  
Phase Field ◽  
Phase Particle ◽  
Alloy System ◽  
Second Phase ◽  
Recrystallization Process ◽  
Time Space ◽  
Second Phase Particles ◽  
Zk60 Alloy

Based on the principle of grain refinement caused by the second-phase particles, a phase field model was built to describe the recrystallization process in the ZK60 alloy system with Y added under applied stress between temperatures 573 and 673 K for 140 min duration. The simulation of grain growth with second phase particles and applied stress during annealing process on industrial scale on the condition of real time-space was achieved. Quantitative analysis was carried out and some useful laws were revealed in ZK60 alloy system. The second phase particles had a promoting effect on the grain refinement, however the effect weakened significantly when the content exceeded 1.5%. Our simulation results reveal the existence of a critical range of second phase particle size of 0.3–0.4 μm, within which a microstructure of fine grains can be obtained. Applied stress increased the grain coarsening rate significantly when the stress was more than 135 MPa. The critical size of the second phase particles was 0.4–0.75 μm when the applied stress was 135 MPa. Finally, a microstructure with a grain size of 11.8–13.8 μm on average could be obtained when the second phase particles had a content of 1.5% and a size of 0.4–0.75 μm with an applied stress less than 135 Mpa after 30 min annealing at 573 K.

Role of second-phase particles in the microstructural evolution and mechanical properties of extruded Mg-Gd-Y-Ag-Zr alloys

2020 ◽  
Vol 24 ◽  
pp. 100956
Author(s):  
Fan Zhang ◽  
Yafei Wang ◽  
Yunbiao Duan ◽  
Kaijun Wang ◽  
Yutian Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructural Evolution ◽  
Second Phase ◽  
Second Phase Particles ◽  
Zr Alloys

Effect of Micro-Voids on Crack Initiation and Propagation in Bending Deformation of Al-Mg-Si Alloy Sheet

2014 ◽  
Vol 794-796 ◽  
pp. 325-330 ◽  
Author(s):  
Yusuke Yamamoto ◽  
Mineo Asano ◽  
Hideo Yoshida ◽  
Masakazu Kobayashi ◽  
Hiroyuki Toda
Keyword(s):  
Crack Initiation ◽  
Phase Particle ◽  
Shear Bands ◽  
Alloy Sheet ◽  
Second Phase ◽  
Coarse Particles ◽  
Crack Initiation And Propagation ◽  
Cube Orientation ◽  
Second Phase Particles ◽  
Initiation And Propagation

The crack initiation and propagation during bending have been considered to be affected by second phase particles, micro-voids and shear-bands. However, the effects of the second phase particles and the micro-voids on the crack initiation and propagation during bending have not been fully investigation. In this study, the effect of the second phase particle distribution on the formation of micro-voids, and the effect of the micro-voids on the crack initiation and propagation during bending were investigated using the largest synchrotron radiation facility “SPring-8” and FE-SEM/EBSD. With the bending ratio increasing, the micro-voids increased around the coarse particles near the outer surface. In particular, coarse micro-voids were formed around coarse particles with a high aspect ratio on the shear-bands. At a large cracked part, coarse micro-void was observed at the outmost layer section as a crack initiation site, and coarse micro-voids and asheared fracture surface were observed at the crack propagation site. At the small cracked part with no propagation, cube orientation grains were located under the small crack. It was considered that these cube orientation grains inhibited the formation of shear-bands, therefore, propagation of the cracks did not occur at the small cracked area.

The Role of Second Phase Intermetallic Precipitates in Fatigue Fracture Mechanism for Aluminum Alloy AW 7075

2013 ◽  
Vol 592-593 ◽  
pp. 809-812 ◽  
Author(s):  
Grzegorz Chruścielski ◽  
Leszek Korusiewicz
Keyword(s):  
Fatigue Crack ◽  
Fatigue Fracture ◽  
Rolling Direction ◽  
Second Phase ◽  
Strain Fracture ◽  
Second Phase Particles ◽  
Phase Intermetallic ◽  
Plain Strain ◽  
Two Stages

This paper presents the results of durability tests of AW7075 aluminium alloy, which is widely used in producing high-durable and particularly reliable constructions in aeronautical and automotive industries. The plain-strain fracture toughness, depending on the orientation of fracture direction with respect to the rolling direction of the material, and the fatigue crack growth rate were determined. Based on scanning electron microscope (SEM) studies the two stages of fatigue fracture are shown: the first is plastic striations and the second is phenomenon of connecting micropores that were formed around intermetallic second phase particles. As a results of research a model of fatigue crack for the second stage is presented.

scholarly journals Unravelling the characteristics of Al-alloy corrosion at the atomic to nanometre scale by transmission electron microscopy

2020 ◽  
Vol 326 ◽  
pp. 01007
Author(s):  
Shravan K. Kairy ◽  
Nick Birbilis
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Al Alloy ◽  
Second Phase ◽  
Clear Understanding ◽  
Transmission Electron ◽  
Second Phase Particles ◽  
Al Matrix

The localised corrosion associated with Mg2Si in the Al-matrix of an Al-Mg-Si alloy was studied in 0.1 M NaCl at pH 6 by quasi in-situ transmission electron microscopy. Herein, physical imaging of corrosion at the atomic to nanometre scale was performed. Phase transformation and subsequent chemical composition variations associated with the localised corrosion of Mg2Si were studied. It was observed that corrosion initiated upon Mg2Si, often preferentially at the interface with the Al-matrix, and propagated until Mg2Si was completely dealloyed by Mg-dissolution, resulting in an amorphous SiO-rich phase remnant. The SiO-rich remnant became electrochemically inert and did not initiate corrosion in the Al-matrix. This study provides a clear understanding on the localised corrosion of Al-alloys associated with Mg2Si. In addition, the methodology followed in this study can also be applied to understand the role of precipitates and second phase particles in the localised corrosion of Al-alloy systems.

Effect of Rolling Process on the Microstructure of AlMgSi Alloy

2011 ◽  
Vol 399-401 ◽  
pp. 40-45
Author(s):  
He Liang Li ◽  
Xiao Guang Yuan ◽  
Ming Fu Wu ◽  
Hong Jun Huang
Keyword(s):  
Reduction Rate ◽  
Rolling Process ◽  
Alloy Sheet ◽  
Second Phase ◽  
Rolling Pass ◽  
Second Phase Particles ◽  
Deformation Inhomogeneity ◽  
Hot And Cold Rolling ◽  
Process Combination ◽  
Almgsi Alloy

In this paper, a AlMgSi alloy for sheet materials was designed on the base of 6111 aluminum alloy, the alloy sheet was fabricated by the rolling process combination of hot and cold rolling, the effect of rolling process on the microstructure of alloy was studied. The results show that different 1st rolling pass reductions of 13%, 33% and 47%, alloy microstructure changes obviously. With the increasing of 1st rolling pass reductions, the re-crystallization structure grow in quantity, re-crystallization grain more and more dense, flat, uniform, and the second phase particles are also more small, distributes more uniform. When the first cold rolled reduction is 47%, degree of grain refinement, the second phase particles fragmentation and tissue uniformity in rolling 3st state are obviously superior to the 1st state and 2st states. The deformation inhomogeneity can be overcome by improving the first reduction rate, the re-crystallization process of synchronization between surface layer and the center layer is better.

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