Study on Erosion-Abrasion Properties of Al-Mn Alloy and its Composite Reinforced with Al2O3 Particulates

2011 ◽  
Vol 287-290 ◽  
pp. 599-602
Author(s):  
Bing Liu ◽  
Xin Mei Li ◽  
Yao Ning Sun ◽  
Liu Xiang ◽  
Chun Yao Wang
Keyword(s):  
Solid Solution ◽  
Mass Loss ◽  
Failure Mechanism ◽  
Abrasion Resistance ◽  
Abrasion Test ◽  
Cumulative Mass ◽  
Impact Angles

Effects of different impact angles such as 45°and 90°on the erosion-abrasion properties of Al-Mn alloy and its composites reinforced with Al2O3 particulates were studied by rotating erosion-abrasion test, and the failure mechanism were analyzed. The results show that the as-cast Al-Mn alloy is composed of aluminium-manganese solid solution, MnAl6 and Al11Mn4 phase, while the δ-Al2O3 particles are included in the composites besides the aforementioned microstructures. The cumulative mass loss of the Al-Mn alloy and its composites at 45° are both more than those at 90°, however, the loss of the composites are lower than those of the Al-Mn alloy, suggesting that the former possesses more excellent erosion-abrasion resistance properties.

Erosion-Abrasion Behavior of Eutectic Al-Mn Alloy Matrix Composites Reinforced with Al2O3 Particulates

2010 ◽  
Vol 152-153 ◽  
pp. 1054-1057
Author(s):  
Bing Liu ◽  
Xin Mei Li ◽  
Xiang Liu ◽  
Chun Yao Wang
Keyword(s):  
Solid Solution ◽  
Shear Stress ◽  
Impact Angle ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Abrasion Test ◽  
Wear Rates ◽  
Impact Angles ◽  
The Impact ◽  
Worn Surface

Effects of different impact angles such as 45°and 90°on the erosion-abrasion properties of eutectic Al-Mn alloy and its composites reinforced with Al2O3 particulates were studied by rotating erosion-abrasion test, and the microstructure and the worn surfaces were analyzed. The results show that the as-cast Al-Mn alloy is composed of aluminium-manganese solid solution, MnAl6 and Al11Mn4 phase, while the δ-Al2O3 particles are included in the composites besides the aforementioned microstructures. With elongating the erosion time, the wear rates of the Al-Mn alloy and its composites increase at the impact angle of 90°, whereas they firstly increase and then decrease , and there is a maximum at 45°. The distortion wear caused by the normal stress is dominant at 90°, which lead to the erosion pits on the worn surface. However, the cutting wear by the shear stress is predominant at 45°, which result in the ploughs.

Effects of Impact Angles on Erosion-Abrasion Properties of Hypereutectic Al-Mn Alloy Matrix Composite Reinforced with Al2O3 Particulates

2011 ◽  
Vol 194-196 ◽  
pp. 190-193
Author(s):  
Bing Liu ◽  
Xin Mei Li ◽  
Xiang Liu ◽  
Chun Yao Wang
Keyword(s):  
Solid Solution ◽  
Shear Stress ◽  
Normal Stress ◽  
Impact Angle ◽  
Alloy Matrix ◽  
Abrasion Test ◽  
Wear Rates ◽  
Impact Angles ◽  
The Impact ◽  
Worn Surface

Effects of different impact angles such as 45°and 90°on the erosion-abrasion properties of hypereutectic Al-Mn alloy and its composites reinforced with Al2O3 particulates were studied by rotating erosion-abrasion test, and the microstructure and the worn surfaces were analyzed. The results show that the as-cast Al-Mn alloy is composed of aluminium-manganese solid solution, MnAl6 and Al11Mn4 phase, while the δ-Al2O3 particles are included in the composites besides the aforementioned microstructures. With elongating the erosion time, the wear rates of the Al-Mn alloy and its composites increase at the impact angle of 90°, whereas they firstly increase and then decrease , and there is a maximum at 45°. The distortion wear caused by the normal stress is dominant at 90°, which lead to the erosion pits on the worn surface. However, the cutting wear by the shear stress is predominant at 45°, which result in the ploughs.

scholarly journals Abrasion resistance of composites polymerized by light-emitting diodes (LED) and halogen light-curing units

2006 ◽  
Vol 17 (1) ◽  
pp. 29-33 ◽  
Author(s):  
Janisse Martinelli ◽  
Fernanda de Carvalho Panzeri Pires-de-Souza ◽  
Luciana Assirati Casemiro ◽  
Camila Tirapelli ◽  
Heitor Panzer
Keyword(s):  
Surface Roughness ◽  
Mass Loss ◽  
Abrasion Resistance ◽  
Composite Resin ◽  
Composite Resins ◽  
Halogen Lamp ◽  
Light Emitting ◽  
Halogen Light ◽  
Light Curing ◽  
Toothbrush Abrasion

This study compared the abrasion resistance of direct composite resins cured by light-emitting diodes (LED) and halogen light-curing units. Twenty specimens (12 mm in diameter; 1.0 mm thick) of each composite resin [TPH (Dentsply); Definite (Degussa); Charisma (Heraus Kulzer)] were prepared using a polytetrafluoroethylene matrix. Ten specimens per material were cured with the LED source and 10 with the halogen lamp for 40 s. The resin discs were polished, submitted to initial surface roughness reading (Ra initial - mum) in a roughness tester and stored in water at 37°C for 15 days. The specimens were weighed (M1) and submitted to simulated toothbrushing using slurry of water and dentifrice with high abrasiveness. After 100 minutes in the toothbrushing simulator, the specimens were cleaned, submitted to a new surface roughness reading (Ra final - mum) and reweighed (M2). Mass loss was determined as the difference between M1 and M2. Data were recorded and analyzed statistically by one-way ANOVA and Tukey Test at 5% significance level. The composite resin with greater size of inorganic fillers (TPH) showed the lowest mass loss and surface roughness means, indicating a higher resistance to toothbrush abrasion (p<0.05). Definite cured with LED presented the least resistance to toothbrush abrasion, showing the highest means of surface roughness and mass loss (p<0.05). The LED source did not show the same effectiveness as the halogen lamp for polymerizing this specific composite resin. When the composite resins were cured a halogen LCU, no statistically significant difference was observed among the materials (p>0.05). It may be concluded that the type of light-curing unit and the resin composition seemed to interfere with the materials' resistance to abrasion.

Urinary 3-methylhistidine and progressive winter undernutrition in white-tailed deer

1998 ◽  
Vol 76 (11) ◽  
pp. 2090-2095 ◽  
Author(s):  
Glenn D DelGiudice ◽  
Ken D Kerr ◽  
L David Mech ◽  
Michael R Riggs ◽  
Ulysses S Seal
Keyword(s):  
Mass Loss ◽  
Muscle Protein ◽  
Curvilinear Relationship ◽  
Base Line ◽  
Physiological Indicators ◽  
Nutritional Restriction ◽  
Muscle Catabolism ◽  
Cumulative Mass ◽  
Relationship Of ◽  
The Relationship

Physiological indicators of muscle catabolism would aid assessment of winter nutritional restriction of ungulates, and urinary 3-methylhistidine has exhibited potential in this regard in several species. We examined the effect of chronic moderate and severe nutritional restriction during winter on urinary 3-methylhistidine:creatinine ratios in seven adult white-tailed deer (Odocoileus virginianus) and the relationship of these ratios to urinary urea nitrogen:creatinine ratios. Mean base line estimates of urinary 3-methylhistidine:creatinine ratio for the control and severely restricted deer (0.043 and 0.086 µmol:mg, respectively) were similar (P = 0.280) and remained unchanged in the control deer throughout the study. In contrast, mean 3-methylhistidine:creatinine ratios increased dramatically as nutritional restriction and cumulative mass loss progressed; the quadratic component of the data for the chronically restricted deer was significant (P < 0.001). Likewise, there was a strong curvilinear relationship (R2 = 0.82) between cumulative mass loss (up to 29%) of the pooled deer and urinary 3-methylhistidine:creatinine ratios. Further, urinary urea nitrogen:creatinine ratios were strongly related to 3-methylhistidine:creatinine ratios (r2 = 0.89). Our study indicates that further investigation of 3-methylhistidine as an indicator of physical condition and muscle protein breakdown is warranted.

Microstructure and Abrasion Resistance of Laser Cladding CoCrFeNiTiNbB1.25 High-Entropy Alloys Coatings Treated by Aging

2021 ◽  
Vol 13 (8) ◽  
pp. 1479-1487
Author(s):  
Lin Ding ◽  
Hongxin Wang ◽  
Xiumin Quan
Keyword(s):  
Abrasive Wear ◽  
Mass Loss ◽  
Laser Cladding ◽  
Aging Temperature ◽  
Abrasion Resistance ◽  
Volume Fraction ◽  
High Entropy Alloys ◽  
H13 Steel ◽  
High Entropy ◽  
The Right

Laser cladding CoCrFeNiTiNbB1.25 high-entropy alloys coatings on H13 steel was fabricated. The microstructure and abrasion resistance of aged high-entropy alloys coatings at different temperature were researched. Results showed the phase was not changed in the high-entropy alloys coatings as the aging temperature elevated, the volume fraction of TiB phase was firstly increased, then reduced. The diffraction peak of fcc phase was firstly shifted to the right, and then shifted to the left. The aged high-entropy alloys coatings consisted of typical dendrite, interdendritic eutectic and dispersed intermetallic compound, and the dendrite obviously was coarsened after aging at 850 °C. Compared with non-aged high-entropy alloys coatings, the microhardness of aged high-entropy alloys coatings was firstly elevated as the aging temperature elevated, then decreased, and the mass loss was opposite. The microhardness and mass loss was decreased by 4.3% and 11.9%, respectively, for the aging at 750 °C. The abrasion mechanism of non-aged high-entropy alloys coatings was the abrasive wear, and was the abrasive wear and adhesive wear after aging.

Application of Multi-Layer Composite Membrane in Tricone Bit Bearing

2011 ◽  
Vol 314-316 ◽  
pp. 62-65 ◽  
Author(s):  
Ya Ling Qiu ◽  
Shi Bin Li ◽  
Wei He ◽  
Chuan Jun Han
Keyword(s):  
Chemical Composition ◽  
Magnetron Sputtering ◽  
Surface Topography ◽  
Composite Membrane ◽  
Abrasion Resistance ◽  
Composite Membranes ◽  
Abrasion Test ◽  
Layer Composite

Composite membranes of TiN, WC/C and TiAlN+WC are successfully prepared by means of magnetron sputtering. An analysis of the membranes’ hardness, surface topography and chemical composition indicates that the composite membrane have a greater hardness, and are compact in structure and uniform in texture. A abrasion test is conducted by applying the three membranes respectively to tricone bit bearings, and then a comparison made between them and non-membrane tricone bit bearing leads to the finding that tricone bit bearing with TiAlN+WC/C composite membrane has the highest abrasion resistance, with a dramatic increase of 30%~40%.

Hardness and Abrasion Resistance of Nanocrystalline Nickel Alloys Near the Hall-Petch Breakdown Regime

2002 ◽  
Vol 740 ◽  
Author(s):  
Christopher A. Schuh ◽  
T. G. Nieh
Keyword(s):  
Solid Solution ◽  
Abrasion Resistance ◽  
Nickel Alloys ◽  
Scratch Resistance ◽  
Scientific Interest ◽  
Nanocrystalline Nickel ◽  
Grain Sizes ◽  
Structural Applications ◽  
Nickel Tungsten

ABSTRACTThe breakdown of classical Hall-Petch scaling remains an area of scientific interest, and will govern the limiting strength of nanocrystalline alloys for structural applications. In this work we discuss the hardness and scratch resistance of nanocrystalline nickel and nickel-tungsten solid solution alloys, assessed through nanoindentation and nano-scratch techniques. The materials have been prepared by electrodeposition, and are fully dense with grain sizes between 6 and 22 nm. In this range of grain sizes, there is some evidence for a breakdown of Hall-Petch scaling, reflected in both the hardness and abrasion data. The role of solid solution alloying on this breakdown is also discussed.

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