scholarly journals Microstructural Evolution of Multi-Pass Caliber-Rolled Mg–Sn and Mg–Sn–Mn Alloys

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1203
Author(s):  
Jinyeong Yu ◽  
Hongxin Liao ◽  
Jeong Hun Lee ◽  
Young Hoon Moon ◽  
Hyun Sik Yoon ◽  
...  
Keyword(s):  
Grain Refinement ◽  
Microstructural Evolution ◽  
Mass Production ◽  
Rolling Direction ◽  
Mg Alloys ◽  
Texture Development ◽  
Basal Texture ◽  
Microstructural Characteristics ◽  
Plane Normal ◽  
Alloying Effects

Multi-pass caliber rolling has proven its vast potential for ultrafine-scale grain refinement and mass production of various metals. Nevertheless, the studies related to Mg alloys have primarily focused only on a few commercial materials, such as AZ31 and ZK60 Mg alloys. This is the first study to investigate caliber-rolled Mg–1Sn (TM10) and Mg–1Sn–1Mn (TM11) alloys. Specifically, this work aims to elucidate the microstructural characteristics of these alloys, including grain refinement, recrystallization, and texture development. Such features were discussed from the viewpoints of alloying effects (i.e., Sn and Mn) and mechanical effects (i.e., caliber-rolling strains). The combination of the addition of Mn and high-redundant strain results in effective grain refinement of the caliber-rolled TM11 Mg alloys. In addition, both TM10 and TM11 Mg alloys exhibit a unique split basal texture, wherein the basal poles are tilted in the plane normal to the rolling direction.

Understanding a Microstructure Using GOS (Grain Orientation Spread) and Its Application to Recrystallization Study of Hot Deformed Al-Cu-Mg Alloys

2007 ◽  
Vol 558-559 ◽  
pp. 153-158 ◽  
Author(s):  
Soon Wuk Cheong ◽  
Hasso Weiland
Keyword(s):  
Microstructural Evolution ◽  
Grain Orientation ◽  
Microstructural Characterization ◽  
Mg Alloys ◽  
Softening Process ◽  
Grain Orientation Spread ◽  
Alloying Effects

The softening process consists of recovery and recrystallization. Despite the significant effect of recovery on the softening, recovery has not enjoyed the attention as much as recrystallizaion has mostly due to difficulties in the microstructural characterization of recovery. The present study introduced GOS qualitatively and quantitatively to gauge the microstructural evolution occurring during annealing. Then the GOS analysis was applied to discern alloying effects on recrystallization in hot deformed Al-Cu-Mg alloys. Recovery seems accountable for the retardation of recrystallization in the Mn containing alloys. By adding Zr to Al-Cu-Mg-Mn, recrystallization could be further inhibited.

Effect of Solidification Grain Refinement on the Development of Wrought Mg Alloys

2007 ◽  
pp. 1729-1734
Author(s):  
Mark A. Easton ◽  
Chris H.J. Davies ◽  
Matthew R. Barnett ◽  
Franka Pravdic
Keyword(s):  
Grain Refinement ◽  
Mg Alloys

Microstructural Evolution and Mechanism of Grain Refinement During Annealing of Cold-Drawn Copper Clad Steel Wires

JOM ◽  
2019 ◽  
Vol 72 (6) ◽  
pp. 2134-2138
Author(s):  
Hongjuan Li ◽  
Zhimin Ding ◽  
Fengliang Tan ◽  
Baogang Liu
Keyword(s):  
Grain Refinement ◽  
Microstructural Evolution ◽  
Steel Wires ◽  
Clad Steel

Numerical Investigation of the Origin of Anomalous Tensile Twinning in Magnesium Alloys

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
K. V. Vaishakh ◽  
N. Subrahmanya Prasad ◽  
R. Narasimhan
Keyword(s):  
Magnesium Alloys ◽  
Basal Slip ◽  
Rolling Direction ◽  
Local Stress ◽  
Tensile Loading ◽  
Normal Direction ◽  
Basal Texture ◽  
Loading Direction ◽  
Az31 Mg Alloy ◽  
Catalytic Role

It has been observed that tension twins (TTs) are triggered in rolled polycrystalline magnesium alloys under tensile loading applied along the rolling direction (RD) or the transverse direction. This is surprising because these alloys have a near-basal texture, and TTs would therefore cause extension (instead of contraction) along the normal direction. In this work, the origin of these anomalous TTs is first examined by performing crystal plasticity-based finite element simulations using model textures, wherein the c-axis in one grain is systematically tilted toward the loading direction (RD), with the other grains maintained in ideal basal orientation. It is shown that strong basal slip is triggered in the former, which through its effect on the local stress distribution plays a catalytic role in activating TTs. The above behavior is also observed in a simulation performed with an actual texture pertaining to a rolled AZ31 Mg alloy. Most importantly, when basal slip is suppressed, evolution of TTs is found to be very much retarded. The present results corroborate well with experimental observations.

Role of Bi and Ca Additions in Controlling the Microstructure of Sr-Modified 319 Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 1257-1264 ◽  
Author(s):  
S. El Hadad ◽  
A.M. Samuel ◽  
F.H. Samuel ◽  
H.W. Doty ◽  
S. Valtierra
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Image Analysis ◽  
Mg Alloys ◽  
Microstructural Characteristics ◽  
Optical And Electron Microscopy ◽  
Modification Effect ◽  
Eutectic Si ◽  
Mg Addition

The role of bismuth (50 to 9000 ppm) and calcium (50 to 200 ppm) additions on the microstructural characteristics in Sr-modified 319 alloys (with/without 0.4 wt% Mg addition) were investigated using optical and electron microscopy, and image analysis. It was found that the modification effect of Sr continuously diminished with Bi addition up to ~3000 ppm Bi; further Bi addition led to the modification of the Si particles due to the presence of Bi. In the Ca-containing alloys, a coarse eutectic Si structure resulted with Ca additions of 50 ppm, due to the formation of Alx(Ca,Sr)Siy compounds. Increased Ca additions (up to 200 ppm) did not alter the Si particle size. The Alx(Ca,Sr)Siy phase particles appeared in rod-like form in the Sr-modified alloys and in plate-like form in the 319+0.4 wt% Mg alloys. MgO, Al2O3, and AlP particles appear to act as nucleants for the precipitation of the plate-like Alx(Ca,Sr)Siy phase.

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