scholarly journals THE INFLUENCE OF SOLUTION TREATMENT ON THE STRUCTURE AND MECHANICAL AND TRIBOLOGICAL PROPERTIES OF MAGNESIUM ALLOY WE54

Tribologia ◽  
2016 ◽  
Vol 267 (3) ◽  
pp. 19-28 ◽  
Author(s):  
Adam BARYLSKI ◽  
Krzysztof ANIOŁEK ◽  
Michał DWORAK
Keyword(s):  
Magnesium Alloy ◽  
Tribological Properties ◽  
Solution Treatment ◽  
Hot Water ◽  
Linear Wear ◽  
Mechanical And Tribological Properties ◽  
Solution Treated ◽  
Ice Water ◽  
Temperature Water ◽  
Ball On Disc

The paper presents the influence of solution treatment on the mechanical and tribological properties of the WE54 magnesium alloy. The investigated alloy was solution treated at a temperature of 545oC for 8 hours and cooled in ice water (0oC), in room temperature water (20oC), and in hot water (95oC). Depending on the applied solution treatment parameters, a diversified decrease in hardness and Young's modulus was obtained. The lowest values of hardness H and modulus E were obtained when cooling in ice water. Abrasive wear of alloy WE54 was tested using a ball-on-disc tribometer (with a ZrO2 ball). The tests have shown more than a threefold reduction in the volumetric wear and a twofold reduction in the linear wear, as well as favourable changes of the friction coefficient (a 20% decrease) as compared to the material in the as-received condition.

scholarly journals THE EFFECT OF LOAD ON THE TRIBOLOGICAL PROPERTIES OF MAGNESIUM ALLOY WE54 AFTER PRECIPITATION HARDENING

Tribologia ◽  
2017 ◽  
pp. 11-15
Author(s):  
Adrian BARYLSKI ◽  
Krzysztof ANIOŁEK ◽  
Marian KUPKA ◽  
Michał DWORAK
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Tribological Properties ◽  
Precipitation Hardening ◽  
Treatment Time ◽  
Ageing Time ◽  
Mechanical Tests ◽  
Linear Wear ◽  
Direct Influence ◽  
Mechanical And Tribological Properties

The paper presents the effect of precipitation hardening on the mechanical and tribological properties of magnesium alloy WE54. Mechanical tests have shown that the hardness and Young’s modulus of the alloy increased as the ageing time became longer. Improvement of the mechanical properties had a direct influence on the tribological properties. Tribological tests were performed on a ball-on-disk tribometer, applying variable loads of 2, 5, and 10 N. In the tests, a more than fourfold decrease in the specific wear rate, a threefold reduction in the linear wear, and a ca. 20% reduction of the friction coefficient were observed. The best results were obtained for ageing time of 24 h. The extension of the heat treatment time to 48h caused overageing of the alloy, which resulted in the deterioration of its mechanical and tribological properties.

Effects of T6 Age Hardening on Microstructure and Mechanical Properties of Al-Si-Cu Cast Aluminium Alloy

2013 ◽  
Vol 770 ◽  
pp. 88-91
Author(s):  
Amporn Wiengmoon ◽  
Pattama Apichai ◽  
John T.H. Pearce ◽  
Torranin Chairuangsri
Keyword(s):  
Electron Microscopy ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Aging Time ◽  
Artificial Aging ◽  
Solution Treatment ◽  
Hot Water ◽  
Age Hardening ◽  
Solution Treated ◽  
Cast Condition

Effects of T6 artificial aging heat treatment on microstructure, microhardness and ultimate tensile strength of Al-4.93 wt% Si-3.47 wt% Cu alloy were investigated. The T6 age hardening treatment consists of solution treatment at 500±5°C for 8 hours followed by quenching into hot water at 80°C and artificial aging at 150, 170, 200 and 230°C for 1-48 hours followed by quenching into hot water. Microstructure was characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). XRD and SEM revealed that the microstructure in the as-cast condition consists of primary dendritic α-Al, acicular-plate and globular forms of eutectic Si and intermetallic phases including globular Al2Cu and a flake-shape Al5FeSi. By T6 aging hardening, some intermetallics were dissolved and spheroidized. The volume fraction of eutectic phases in the as-cast, solution-treated, and solution-treated plus aging at 170°C for 24 hours is 17%, 12% and 10%, respectively. TEM results showed that precipitates in under-aging condition at 170° C for 6 hours are in the form of disc shape with the diameter in the range of 7-20 nm. At peak aging at 170°C for 24 hours, thin-plate precipitates with about 3-10 nm in thickness and 20-100 nm in length were found, lengthening to about 30-200 nm at longer aging time. The microhardness and ultimate tensile strength were increased from 71 HV0.05 and 227 MPa in the as-cast condition up to 140 HV0.05 and 400 MPa after solution treatment plus aging at 170°C for 24 hours, and decreased at prolong aging time.

TRIBOLOGICAL PROPERTIES OF Al2O3/ZrO2 SINTERED CERAMICS

Tribologia ◽  
2019 ◽  
Vol 283 (1) ◽  
pp. 67-72
Author(s):  
Grzegorz WIĄZANIA ◽  
Marcin KOT ◽  
Agnieszka WOJTECZKO ◽  
Zbigniew PĘDZICH
Keyword(s):  
Composite Materials ◽  
Tribological Properties ◽  
Dry Friction ◽  
Elevated Temperatures ◽  
Friction Contact ◽  
Manufacturing Costs ◽  
Mechanical And Tribological Properties ◽  
Complex Shapes ◽  
Ball On Disc

The paper presents mechanical and tribological properties of Al2O3/ZrO2 composite sinters with different proportions of Al2O3 and ZrO2 phases. These materials are commonly used in dry friction contact due to relatively low manufacturing costs of even complex shapes of products and the possibility of working at elevated temperatures. The tests were carried out by the ball-on-disc method at temperatures of 20, 150, 300, and 500°C. A ball made of Al2O3 was used as a counterpart. The results were compared with the following sintered mono-phase materials: Al2O3(alumina) and tetragonal yttria-stabilized ZrO2 polycrystallines (Y-TZP). The tests showed the significantly better properties of composite materials.

Tribological Properties of WC-12Co Coating on AZ91 Magnesium Alloy Fabricated by High Velocity Oxy-Fuel Spray

2014 ◽  
Vol 33 (1) ◽  
pp. 41-48 ◽  
Author(s):  
F. Yıldız
Keyword(s):  
Magnesium Alloy ◽  
Tribological Properties ◽  
High Velocity ◽  
Wear Behavior ◽  
Fuel Spray ◽  
Az91 Magnesium Alloy ◽  
Mechanical And Tribological Properties ◽  
Hardness Tester ◽  
Pin On Disc ◽  
Az91 Magnesium

AbstractIn this study, conventional WC-12Co cermet coatings were deposited on AZ91 magnesium alloy using High Velocity Oxy-Fuel spray method. The effects of different coating thicknesses (60 and 120 µm) and wear loads (20 and 30 N) on tribological properties of AZ91 magnesium alloy coated with WC-12Co were investigated. Structural, mechanical and tribological properties of WC-12Co coatings were analyzed by means of X-ray diffractometer, scanning electron microscope, micro-hardness tester and pin-on-disc tribotester. It was observed that WC-12Co coating is an effective method for improving the wear behavior of AZ91 magnesium alloy.

A TEM study of discontinuous precipitation in Cu-Be alloys

1978 ◽  
Vol 36 (1) ◽  
pp. 656-657
Author(s):  
Joseph R. Michael
Keyword(s):  
Electron Microscope ◽  
Grain Boundary ◽  
Single Phase ◽  
Discontinuous Precipitation ◽  
Solution Treatment ◽  
Discontinuous Precipitate ◽  
Boundary Precipitate ◽  
Solution Treated ◽  
Water Quench ◽  
Ice Water

It is known that a lamellar discontinuous precipitate forms in aged Cu-1.8wt.% Be alloys. The purpose of this study was to investigate factors which influence the formation of the precipitate and to characterize its growth.To determine the effect of solution treatment on the discontinuous precipitate, specimens were solution treated at 800°C, 850°C, and 900°C for 1 hour followed by an ice water quench. Some of the solution treated specimens were examined in the as-quenched condition. The remaining specimens were aged at 340°C for 24 hours. The specimens were thinned with a twin-jet electropolishing unit using 30% HNO3 in methanol at -60°C. The specimens were then examined using either an RCA-EMU3G or a Philips EM-300 electron microscope.Each solution treated specimen was not single phase, but showed some residual grain boundary precipitate which implies that the solution anneal was not sufficient, or else precipitation had occurred during quenching. The higher solution treatment temperatures slightly reduced the amount of this grain boundary precipitate, but none completely removed it, even after five hours at temperature,indicating quench decomposition as the mechanism responsible.

Correlation between Tribological Properties, sp²/sp³-Ratio and H-Content of Low-Wear Diamond-Like Carbon (DLC) Layers

2012 ◽  
Vol 706-709 ◽  
pp. 2596-2601
Author(s):  
E. Vogli ◽  
Fabian Hoffmann ◽  
E. Bartis ◽  
G. S. Oehrlein ◽  
Wolfgang Tillmann
Keyword(s):  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Diamond Like Carbon ◽  
Ion Energy ◽  
Capacitively Coupled ◽  
X Ray ◽  
Mechanical And Tribological Properties ◽  
Plasma Device ◽  
Low Wear ◽  
Ball On Disc

It has been established that hardness and density of diamond-like carbon (DLC) layers can be raised by increasing ion energy during deposition, decreasing H-content and by increasing sp3-fraction. To confirm differences in hydrogen content of hydrogen containing and hydrogen free DLC films deposited at different bias voltages, layers were etched in oxygen atmosphere in a capacitively coupled plasma device. By employing real-time ellipsometry measurements, the H-content of the hydrogen containing a-C:H layers were estimated by determining the optical constants n and k (n-real part and k-imaginary part of the refractive index). In addition, DLC layers were analyzed by X-ray photoelectron spectroscopy to estimate the ratio of sp²- and sp³-hybridization. The mechanical and tribological properties of the coatings were evaluated by means of nanoindentation and ball-on-disc-tests. Finally correlations between these properties, H-content and sp3/sp2-ratio were obtained in an effort to explain different tribological behaviors of DLC-layers.

Research on Microstructure and Tribological Properties of Cr-Based Hard Coatings

2013 ◽  
Vol 811 ◽  
pp. 126-130
Author(s):  
Bai Jun Shi ◽  
Yuan Ping Peng ◽  
Si Chi Wu ◽  
Hang Li
Keyword(s):  
Tribological Properties ◽  
Steel Substrate ◽  
Optical Microscope ◽  
Hard Coatings ◽  
Closed Field ◽  
Mechanical And Tribological Properties ◽  
Unbalanced Magnetron ◽  
Magnetron Sputter ◽  
Better Than ◽  
Ball On Disc

In this paper, three kinds of Cr-based hard coatings have been studied for its structural, mechanical and tribological properties at room temperature. By the technology of closed field unbalanced magnetron sputter ion plating (CFUMSIP), CrN CrAlN and CrTiAlN hard coatings were deposited onto DC53 cold die steel and silicon (100) substrate. The coatings were characterized by means of field emission scanning electron microscopy (FESEM), X-ray diffractometer (XRD), microhardness tester, optical microscope and ball-on-disc tribometer, in order to check their structural, as well as to determine the mechanical and tribological properties. The experimental results showed that the CrTiAlN coating performed better than the CrN coating and the CrAlN coating in terms of mechanical and tribological properties. The wear resistances of CrN, CrAlN and CrTiAlN coatings have been significantly improved compared with DC53 steel substrate.

scholarly journals Al/Niobium Diboride Nanocomposite’s Effect on the Portevin-Le Chatelier Phenomenon in Al-Mg Alloys

2019 ◽  
Vol 3 (3) ◽  
pp. 70
Author(s):  
David Florián-Algarín ◽  
Michelle Marrero-García ◽  
Javier José Martínez-Santos ◽  
Luis Montejo Valencia ◽  
Oscar Marcelo Suárez
Keyword(s):  
Tensile Deformation ◽  
Solution Treatment ◽  
Signal Amplitude ◽  
Mg Alloys ◽  
Dynamic Strain ◽  
Solution Treated ◽  
Cold Rolled ◽  
Ice Water ◽  
Mg Melt ◽  
Al Mg Alloys

In Al-Mg alloys, the Portevin-Le Chatelier phenomenon, or dynamic strain aging, reveals itself as serrations upon plastic tensile deformation. This research evaluates this phenomenon when Al/NbB2 nanocomposite pellets are added to a magnesium-supersaturated Al matrix. A ball-milled 90 wt % Al and 10 wt % NbB2 nanocomposite helped inoculate an Al-Mg melt to incorporate the nanoparticles effectively. The melt was cast into rods that were cold-rolled into 1 mm diameter wires. Two sets were prepared: The first group was an as-cast set of samples, for comparison purposes, whereas the second was a solution-treated set. The solution treatment consisted of annealing followed by ice-water quenching. The results corroborating that the phenomenon was observable only in the specimens bearing the solution treatment, were used as the research baseline. Said treated alloy was compared to one containing the nanoparticles, which proved that the NbB2 particles caused a reduction of the serrated signal amplitude.

scholarly journals Tribological Properties of Steel/Tib2 Composites Prepared by Spark Plasma Sintering/ Własności Tribologiczne Kompozytów Stal/Tib2 Otrzymywanych Metodą Sps

2014 ◽  
Vol 59 (4) ◽  
pp. 1263-1268 ◽  
Author(s):  
I. Sulima
Keyword(s):  
Spark Plasma Sintering ◽  
Tribological Properties ◽  
Room Temperature ◽  
316L Stainless Steel ◽  
Wear Behaviour ◽  
Mechanical And Tribological Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Worn Surface ◽  
Ball On Disc

Abstract mechanical and tribological properties of sintered 316L stainless steel composites with TiB2 submicroparticles were investigated. The composites were manufactured by Spark Plasma Sintering (SPS). The wear behaviour was studied by using a ball-on-disc wear tester at room temperature. The worn surface were analysed using Scanning Electron Microscopy (SEM). The results indicated that the friction coefficient and the wear resistance of composites with the same content of TiB2 particles depend on the sintering conditions.

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