Effects of Mg17Al12 second phase particles on twinning-induced recrystallization behavior in Mg‒Al‒Zn alloys during gradient hot rolling

2019 ◽  
Vol 35 (9) ◽  
pp. 2017-2026 ◽  
Author(s):  
Zhong-Zheng Jin ◽  
Xiu-Ming Cheng ◽  
Min Zha ◽  
Jian Rong ◽  
Hang Zhang ◽  
...  
Keyword(s):  
Hot Rolling ◽  
Second Phase ◽  
Recrystallization Behavior ◽  
Second Phase Particles ◽  
Zn Alloys

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.

Effect of Second-Phase Particles on Grain Refinement of Mg-Al-Zn Alloy during ECAE

2007 ◽  
Vol 546-549 ◽  
pp. 315-318
Author(s):  
Li Jin ◽  
Dong Liang Lin ◽  
Xiao Qin Zeng ◽  
Da Li Mao ◽  
Wen Jiang Ding
Keyword(s):  
Electron Microscopy ◽  
Grain Refinement ◽  
Equal Channel Angular Extrusion ◽  
Second Phase ◽  
Transmission Electron ◽  
Initial Stage ◽  
Mg17al12 Phase ◽  
Second Phase Particles ◽  
Zn Alloy ◽  
Zn Alloys

The effect of second-phase particles on the grain refinement of AZ61 and AZ91 Mg-Al-Zn alloys with different volume fractions of β-Mg17Al12 phase particles during equal channel angular extrusion (ECAE) has been investigated. The microstructure were observed by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), which revealed that grain refinement was enhanced by second phase particles at initial stage of ECAE. And finer grains with the high angle grain boundaries (HAGBs) and disperse second-phase particles could be obtained in AZ61 and AZ91 after 8 passes of ECAE.

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.

scholarly journals Effects of hot rolling temperature and aging on the second phase particles of Zr-Sn-Nb-Fe zirconium alloy

2019 ◽  
Vol 20 ◽  
pp. 100700
Author(s):  
Qingsong Fan ◽  
Bo Yuan ◽  
Meng Xie ◽  
Minghua Shi ◽  
Jun Zhou ◽  
...  
Keyword(s):  
Hot Rolling ◽  
Zirconium Alloy ◽  
Rolling Temperature ◽  
Second Phase ◽  
Second Phase Particles

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.

Effect of Second Phase on the Mechanical Properties of Mg-Al-Zn Alloy by Equal Channel Angular Extrusion

2007 ◽  
Vol 546-549 ◽  
pp. 249-252 ◽  
Author(s):  
Wen Jiang Ding ◽  
Li Jin ◽  
Dong Liang Lin ◽  
Xiao Qin Zeng ◽  
Da Li Mao
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Magnesium Alloy ◽  
Equal Channel Angular Extrusion ◽  
Tensile Deformation ◽  
Second Phase ◽  
Second Phase Particles ◽  
Angular Extrusion ◽  
Zn Alloy ◽  
Zn Alloys

The effect of second phase on the mechanical properties of AZ61 and AZ91 Mg-Al-Zn magnesium alloy processed by equal-channel angular extrusion (ECAE) has been investigated. The results revealed that cracks initiated at and propagated through the α-Mg/β-Mg17Al12 interfaces and grain boundaries of Mg-Al-Zn alloys during tensile deformation. For AZ61, the elongation increased with the increase of ECAE pass number and the decrease of grain size. However, the elongation of AZ91 with more second phase particles decreased with the increase of ECAE pass number and the decrease of grain size.

Dynamic Recrystallization Behavior of Ti22Al25Nb Alloy during Hot Isothermal Deformation

2016 ◽  
Vol 35 (10) ◽  
pp. 1021-1030 ◽  
Author(s):  
Jingli Zhang ◽  
Hongzhen Guo ◽  
Houquan Liang
Keyword(s):  
Dynamic Recrystallization ◽  
Volume Fraction ◽  
Phase Particle ◽  
Second Phase ◽  
Recrystallization Behavior ◽  
Hollomon Parameter ◽  
Hardening Mechanism ◽  
Softening Mechanism ◽  
Second Phase Particles ◽  
Dynamic Recrystallization Behavior

AbstractDynamic recrystallization (DRX) of Ti22Al25Nb alloy has been investigated based on the analysis of hot compression experimental data in this paper. The true stress–strain curves of Ti22Al25Nb can be divided into two types: the single-peak conventional dynamic recrystallization (CDRX) curves and the multi-peak discontinuous dynamic recrystallization (DDRX) curves. The multi-peak curves indicate the alternate dominance of hardening mechanism and softening mechanism. A critical Zener–Hollomon parameter ln ZC has been proposed to divide CDRX from DDRX. The hardening rate and DRX volume fraction of CDRX and DDRX have been analyzed. In addition, the effect of the second-phase particle on the DRX has been studied. DRX process was enhanced by the second-phase particles, but the growth process of recrystallized grains was restrained.

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