scholarly journals Microstructure Evolution and Growth Orientation of Directionally Solidified Mg–4 wt% Zn Alloy with Different Growth Rates

2017 ◽  
Vol 30 (12) ◽  
pp. 1185-1191 ◽  
Author(s):  
Hong-Min Jia ◽  
Xiao-Hui Feng ◽  
Yuan-Sheng Yang
Keyword(s):  
Microstructure Evolution ◽  
Growth Rates ◽  
Directionally Solidified ◽  
Growth Orientation ◽  
Zn Alloy

Effect of Ca on Microstructure and Mechanical Properties of Directionally Solidified Mg-Zn-Ca Alloys

2020 ◽  
Vol 993 ◽  
pp. 161-165
Author(s):  
Yi Zhang ◽  
Xiao Hui Feng ◽  
Yuan Sheng Yang
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Tensile Tests ◽  
Deformation Mechanisms ◽  
Prismatic Slip ◽  
Directionally Solidified ◽  
Growth Orientation ◽  
Microstructure And Mechanical Properties ◽  
Dendritic Arm Spacing ◽  
Main Deformation

The effect of Ca on the microstructure and mechanical properties of directionally solidified (DSed) Mg-3Zn-xCa alloys (x=0.2,0.5,0.8wt.%) was investigated in the present work. The results showed that the DSed samples with the growth rate of 120 μm/s had columnar dendritic structures and the primary dendritic arm spacing (PDAS) decreased with the content of Ca increase. The TEM result indicated that the growth orientation of the DSed Mg-Zn-xCa alloys was , which was independent of the content of Ca. The tensile tests at room temperature showed that the mechanical properties of the DSed Mg-Zn-xCa alloys were strongly affected by the content of Ca. The addition of Ca remarkably improved the ultimate tensile strength (UTS) and the yield strength (YS), while dramatically reduced the elongation (El). Prismatic slip and twinning were the main deformation mechanisms in tensile tests.

Microstructure evolution of Mg-3%Al-1%Zn alloy tube during warm bending

2012 ◽  
Vol 47 (8) ◽  
pp. 3801-3807 ◽  
Author(s):  
Li Jin ◽  
Jie Dong ◽  
Alan A. Luo ◽  
Raj K. Mishra ◽  
Anil K. Sachdev ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Alloy Tube ◽  
Zn Alloy

The effects of Zn segregation and microstructure length scale on the corrosion behavior of a directionally solidified Mg-25 wt.%Zn alloy

2017 ◽  
Vol 723 ◽  
pp. 649-660 ◽  
Author(s):  
Nathalia C. Verissimo ◽  
Emmanuelle S. Freitas ◽  
Noé Cheung ◽  
Amauri Garcia ◽  
Wislei R. Osório
Keyword(s):  
Corrosion Behavior ◽  
Length Scale ◽  
Directionally Solidified ◽  
Zn Alloy

Effects of Growth Rates on Directionally Solidified Microstructure of Al-Ni-Y Ternary Alloy

2012 ◽  
Vol 562-564 ◽  
pp. 477-481
Author(s):  
Rui Xu
Keyword(s):  
Temperature Gradient ◽  
Directional Solidification ◽  
Ternary Alloy ◽  
Growth Rates ◽  
Optical Microscope ◽  
Experimental Results ◽  
Al Alloy ◽  
Directionally Solidified ◽  
X Ray Diffraction ◽  
X Ray

The directional solidification of the ternary Al alloy with composition of 2.6 at%Ni, 0.9 at%Y and 96.5 at% Al was carried out under the temperature gradient of 5 K/mm and the droping velocities of 0.5 mm/min, 1 mm/min, 5 mm/min, 10 mm/min, and 25 mm/min. The microstructure of the Al-Ni-Y ternary alloy was also analyzed by X-ray diffraction and optical microscope. The experimental results show that the microstructures of the Al-Ni-Y ternary alloy are consisted of ª-Al2, Al3Ni and Y4Ni6Al23phase when the alloy was directionally solidified in all directionally solidified rates in the experiments. No primary -Al can be found in the sample with directionally solidified rate of 0.5 mm/min. When the rates higher than 1 mm/min, the primary ª-Al can be observed. The microstructure of the directionally solidified alloy becomes finer and the primary ª-Al is smaller gradually with the increasing of growth velocities when the dropping rate of directional solidification is higher than 5 min/min. Two eutectic structures, Y4Ni6Al23andª-Al eutectic and Al3Ni and ª-Al eutectic, can be found when the dropping rate is higher than 10 mm/min.

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