scholarly journals Effect of Ca and Ce on Wear Behavior of Hot-Rolled AZ31 Mg Alloys

2020 ◽  
Vol 137 (4) ◽  
pp. 557-560 ◽  
Author(s):  
İ. Kara ◽  
T. Yousef ◽  
H. Ahlatci ◽  
Y. Türen
Keyword(s):  
Wear Behavior ◽  
Mg Alloys ◽  
Hot Rolled

Tensile Deformation Characteristics of Commercial Mg Alloys Processed by Equal Channel Angular Pressing

2004 ◽  
Vol 449-452 ◽  
pp. 645-648
Author(s):  
Si Young Chang ◽  
Sang Woong Lee ◽  
Jin Chun Kim ◽  
Young Seok Kim ◽  
Dong Hyuk Shin
Keyword(s):  
Tensile Strength ◽  
Yield Stress ◽  
Equal Channel Angular Pressing ◽  
Tensile Deformation ◽  
Az31 Alloy ◽  
Mg Alloys ◽  
Deformation Characteristics ◽  
Angular Pressing ◽  
Fe Alloys ◽  
Hot Rolled

The commercial AZ31 and AZ61 Mg alloys were subjected to equal channel angular pressing (ECAP) after hot rolling at 673 K. The hot-rolled AZ31 alloy could be ECA pressed at 493 K. The 4 ECA pressed AZ31 alloy revealed the microstructure of dynamically recrystallized grains with a grain size in range of 1 to 10μm. Despite the dynamic recrystallization during ECAP at higher temperatures ( > 1/2 Tm), the yield stress and tensile strength of AZ31 and AZ61 alloys drastically increased after 1 pressing. The yield stress gradually decreased with increasing the number of pressings, which contrasts with the behavior of the ECA pressed Al and Fe alloys, while the tensile strength increased slightly. In particular, the alloys showed nearly 3 times higher elongation than as-annealed one after 4 ECAPs, without sacrificing the tensile strength. These tensile deformation characteristics were explained based on the observation of the deformed microstructure in the vicinit of fracture surface.

Dynamic restoration of hot-rolled Al-Mg alloys

1990 ◽  
Vol 25 (3) ◽  
pp. 297-305 ◽  
Author(s):  
J.F. Mao ◽  
X.Y. An ◽  
T.Q. Lei
Keyword(s):  
Mg Alloys ◽  
Hot Rolled ◽  
Al Mg Alloys

Impact and Rolling Abrasive Wear Behavior and Hardening Mechanism for Hot-Rolled Medium-Manganese Steel

2018 ◽  
Vol 140 (3) ◽  
Author(s):  
Jian Wang ◽  
Qingliang Wang ◽  
Xiao Zhang ◽  
Dekun Zhang
Keyword(s):  
Wear Resistance ◽  
Martensitic Transformation ◽  
Work Hardening ◽  
Wear Behavior ◽  
Manganese Steel ◽  
High Manganese ◽  
High Manganese Steel ◽  
Medium Manganese Steel ◽  
Dislocation Strengthening ◽  
Hot Rolled

The coupled impact and rolling wear behavior of the medium-manganese austenitic steel (Mn8) were studied by comparison with the traditional Hadfield (Mn13) steel. Scanning electron microscopy (SEM), X-ray diffractometer (XRD), and transmission electron microscope (TEM) were used to analyze the wear and hardening mechanisms. The experimental results show that the impact and rolling wear resistance of hot-rolled medium-manganese steel (Mn8) is better than that of high-manganese steel (Mn13) under conditions of low-impact load. The better work hardening sensitivity effectively improves the wear resistance of medium-manganese steel. Not only the coefficient of friction is low, but the mass loss and wear rate of the wear are lower than that of high-manganese steel. After impact and rolling wear, a hardened layer with a thickness of about 600 μm is formed on the wear surface. The highest microhardness of the subsurface layer for Mn8 is about 594 HV and the corresponding Rockwell hardness is about 55 HRC, showing the remarkable work hardening effect. The wear-resistant strengthening mechanism of medium-manganese steel is compound strengthening, including the deformation-induced martensitic transformation, dislocation strengthening, and twin strengthening. In initial stages of impact and rolling abrasion, dislocation strengthening plays a major role. When the deformation reaches a certain extent, the deformation-induced martensitic transformation and twinning strengthening begin to play a leading role.

Effect of Rolling on Microstructure and Wear Behavior of Hot Rolled Al6061-Beryl Composites

2012 ◽  
Vol 463-464 ◽  
pp. 444-448 ◽  
Author(s):  
H.N. Reddappa ◽  
K.R. Suresh ◽  
H.B. Niranjan ◽  
K.G. Satyanarayana
Keyword(s):  
Wear Behavior ◽  
Stir Casting ◽  
Matrix Composites ◽  
Casting Technique ◽  
Wear Rates ◽  
Optical Microstructure ◽  
Cast Composites ◽  
The Matrix ◽  
Hot Rolled ◽  
Sliding Distance

The present paper deals with the study of microstructure and wear characteristics of hot rolled beryl reinforced aluminium metal matrix composites (AMMCs). Al6061-beryl composites with 2, 6 and 10% of beryl were made using stir casting technique. The optical microstructure reveals the homogeneous dispersion of beryl particles in the matrix. The worn surfaces have been observed under SEM to understand the mechanism of wear. Hot rolled composites at 4500C possess higher hardness and lower specific wear rates under all loads and sliding distance studied in this investigation, when compared with cast composites.

scholarly journals Ca and Ce Effect on the Corrosion Resistance of Hot-Rolled AZ31 Mg Alloys

2020 ◽  
Vol 10 (1) ◽  
pp. 5113-5116
Author(s):  
I. H. Kara ◽  
T. A. I. Yousef ◽  
H. Ahlatci ◽  
Y. Turen
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Test ◽  
Die Casting ◽  
Immersion Test ◽  
Mg Alloys ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Low Pressure Die Casting ◽  
Hot Rolled ◽  
Pressure Die Casting

In this study, AZ31 Mg alloys with added Ca and Ce were produced by low pressure die casting and were rolled at 400°C. The corrosion properties of the materials were determined by immersion test for 72 hours at a 3.5% NaCl solution. The microstructure of the samples was investigated by light optical microscopy (LOM) and scanning electron microscopy (SEM) before the corrosion test. Twins, dynamic recrystallization (DRX), and the alloying elements have an important role in imparting the final corrosion resistance of the investigated materials.

scholarly journals Tribological Analysis ofMg2SiParticulates Reinforced Powder Metallurgy Magnesium Alloy Composites under Oil Lubrication Condition

2009 ◽  
Vol 2009 ◽  
pp. 1-8 ◽  
Author(s):  
Katsuyoshi Kondoh ◽  
Junko Umeda ◽  
Kenshi Kawabata
Keyword(s):  
Powder Metallurgy ◽  
Friction Coefficient ◽  
Wear Behavior ◽  
Hot Extrusion ◽  
Mg Alloys ◽  
Oil Lubrication ◽  
The Matrix ◽  
High Microhardness ◽  
Tribological Analysis ◽  
Repetition Number

For the evaluation of wear behavior of Mg composites under oil lubrication conditions, powder metallurgyMg97Y2Zn1alloy reinforced with additiveMg2Siparticles were fabricated by the repeated plastic working (RPW) and hot extrusion. The RPW process was effective in refining bothMg2Sireinforcements andα-Mg grains causing the matrix hardening. When increasing the repetition number of RPW process from 200 to 600 cycles, the particle size ofMg2Siadditives changed from 8 μm to 1~2 μm, andα-Mg grain size was 1 μm or less. With regard to the defensive and offensive properties of Mg alloys reinforced withMg2Sidispersoids, the composite had superior adhesive wear resistance compared with the conventional Mg alloys because of its extremely high microhardness of 95~180 Hv by RPW process. The uniform distribution of refinedMg2Siparticles was useful for improving both defensive and offensive properties against AZ31B counter disk specimens. TheMg2Siprominent dispersoids in the matrix were also effective in forming the oil grooves around them, and caused the low and stable friction coefficient. On the other hand, in the case of the composite containing coarseMg2Siparticles, severely deep scratches were given on the counter face of the AZ31B disk, and resulted in an unstable and high friction coefficient.

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