A Study of the Fine Structure and Phase Composition of Magnesium Alloy VMD16 in Cast and Homogenized Conditions

2019 ◽  
Vol 61 (3-4) ◽  
pp. 143-148
Author(s):  
E. F. Volkova ◽  
V. V. Antipov ◽  
A. V. Zavodov
Keyword(s):  
Fine Structure ◽  
Phase Composition ◽  
Magnesium Alloy

scholarly journals Regularities of the formation and features of the influence of a fine structure on the properties of a new-generation magnesium alloy

2020 ◽  
pp. 55-63
Author(s):  
E. F. Volkova ◽  
V. A. Duyunova ◽  
I. V. Mostyaev ◽  
M. V. Akinina
Keyword(s):  
Fine Structure ◽  
Phase Composition ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
High Strength ◽  
Fine Grained ◽  
Long Period ◽  
Noticeable Improvement ◽  
Fine Grained Structure ◽  
New Generation

An approach to creating high-strength deformable magnesium alloys for developing a fine-grained structure and a favourable phase composition is considered. The possibility of a noticeable improvement in the characteristics of magnesium alloys by introducing REEs in certain ratios for the formation of long-period phases (LPSO phases) is considered. The regularities of formation and features of the influence of a fine structure on the properties of a new-generation magnesium alloy of the VMD16 brand are studied.

Evaluation of Plastic Workability Limit of Magnesium Alloy by Cavitations in High Temperature Uni and Biaxial Test

2012 ◽  
Vol 735 ◽  
pp. 67-72
Author(s):  
Kunio Funami ◽  
Daisuke Yamashita ◽  
Kohji Suzuki ◽  
Masafumi Noda
Keyword(s):  
Fine Structure ◽  
High Temperature ◽  
Magnesium Alloy ◽  
Grain Boundary ◽  
Room Temperature ◽  
Grain Boundary Sliding ◽  
Az31 Magnesium Alloy ◽  
Temperature Deformation ◽  
Alloy Plate ◽  
Boundary Sliding

Abstract. This study examined the critical plastic formability limit of a fine-structure AZ31 magnesium alloy plate under warm and high temperature based on the strength of a magnesium alloy that has cavities at room temperature. The cyclic hot free-forging process as pre-form working following rolling at a light reduction ratio fabricated a fine-structure AZ31 magnesium alloy plate. The appearance of the cavities was examined in detail together with changes in the structure and preparation methods before further damage at high temperatures with increasing uni-and biaxial plastic deformation. The allowable deformation limit in the super plasticity process can be estimated from the strength of the deformed material and forming limit diagram (FLD) at room temperature. During high-temperature deformation, cavities are produced by stress concentrations at grain boundary triple points and striation bands due to grain boundary sliding. The cavitations growth behavior is dependent upon deformation conditions, and a high percentage of large cavities occupy the sample surface as a large amount of grain boundary sliding is present, i.e., as uniform elongation grows larger, the cavity size also increases. In a case where 200% uniaxial strain was applied to a fine-grained structure material at a temperature of 623K under a strain rate of 10-4s-1, the tensile strength at room temperature decreased about 13%, and elongation was 10% less, compared with that of a material to which no load was applied due to the influence of cavities. In a case of biaxial deformation, the values were 28% lower. It is possible to draw a FLD based on the cavity incidence fraction .

The Research of Micro Arc Oxidation Behavior of the Magnesium Alloy

2013 ◽  
Vol 803 ◽  
pp. 191-195
Author(s):  
Yun Long Zhang ◽  
Mu Qin Li ◽  
Yu Min Zhang ◽  
Ming Hu
Keyword(s):  
Corrosion Resistance ◽  
Phase Composition ◽  
Magnesium Alloy ◽  
Surface Morphology ◽  
Electrolyte Solution ◽  
Oxidation Behavior ◽  
Corrosion Current ◽  
Positive Potential ◽  
Micro Arc Oxidation ◽  
Oxidation Technology

The ceramics coating hadobtained by the micro arc oxidation technology in order to resolve thecorrosion resistance of the Mg alloy.The phase composition, surface morphology,gained weight and polarization behavior of the micro arc oxidation coating wasinvestigated in details. After the introduce of the sodiumcitrate in the electrolyte solution, thespecimen had high relatively positive potential and low corrosion current, sodoped sodium citratewould improve the corrosion resistance properties of the Mg alloy .

The Influence of Boron Additions in Cast Ti-47AL-2Cr-2Nb-0.8B

1994 ◽  
Vol 364 ◽  
Author(s):  
Daniel S. Schwartz ◽  
Donald S. Shih
Keyword(s):  
Grain Size ◽  
Fine Structure ◽  
Phase Composition ◽  
Titanium Aluminide ◽  
Boron Addition ◽  
Intimate Contact ◽  
Β Phase ◽  
Low Degree ◽  
Degree Of Order ◽  
B2 Structure

AbstractMorphology, fine structure, and chemistry of phases formed in cast Ti-47Al-2Cr-2Nb-0.8B due to boron addition were examined in detail. Boron acts an inoculant, refining and stabilizing the cast grain size. A curving ribbon-shaped phase was present throughout the material, related to the ordered phase Ti2AlCr. The ribbon phase had the B2 structure, with a0∼0.318nm. Many ribbons had a low degree of order, i. e. the material was a BCC mixture of Ti, Al, Nb, and Cr. Ribbon phase composition was variable, measured to be: Ti-(20–30)Al-(2–4)Nb-(5–16)Cr. TiB2 was present in small amounts, always in intimate contact with the ribbon phase. A (100)ribbon ‖ {1100}TiB2, (011)ribbon ‖ {1122}TiB2 orientation relationship was observed. It is proposed that the ribbon phase is a remnant of the high-temperature titanium aluminide β-phase, stabilized by dissolved boron.

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