Surfaces Modification of Al-Cu Alloys by Plasma-Assisted CVD

2013 ◽  
Vol 199 ◽  
pp. 496-501 ◽  
Author(s):  
Karol Kyzioł ◽  
Łukasz Kaczmarek ◽  
Stanisława Jonas
Keyword(s):  
Wear Resistance ◽  
Copper Alloys ◽  
Chemical Vapour ◽  
Argon Plasma ◽  
High Strength ◽  
Aviation Industry ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Aluminum Copper Alloys ◽  
Pre Treatment

Aluminum-copper alloys (Al-Cu) are nowadays widely used in various applications, mainly in automotive and aviation industry, because of their unique properties such as high strength, low density and good corrosion resistance. However, usages of aluminum alloys are partially limited due to their reduced hardness, wear resistance and poor tribological parameters. Desired useful parameters can be improved by application of PA CVD technology. This work presents the results concerning determination and analysis of the structure and the selected properties of the modified surfaces of Al-Cu alloys (2xxx series) that were prepared using plasma assisted MW CVD (Micro-Wave Chemical Vapour Deposition) method. To ensure effectiveness of the substrate modification process, the covered surface was subjected to pre-treatment with argon plasma and/or nitriding process. In conclusion, the research has confirmed that the wear resistance of the Al-Cu alloy can be successfully modified by application of MW CVD technique. The obtained results can serve as a basis in the design of the technology of a-Si:C:N:H layers for diverse applications.

Numerical Modeling of Microporosity Formation in Aluminum-Rich Aluminum-Copper Alloys in Microgravity Conditions

2000 ◽  
Author(s):  
M. Xiong ◽  
A. V. Kuznetsov
Keyword(s):  
Copper Alloys ◽  
Heat Transfer Fluid ◽  
Gas Phases ◽  
Alloy Casting ◽  
Cu Alloy ◽  
Aluminum Copper Alloys ◽  
Three Phase ◽  
Microgravity Conditions ◽  
Parametric Analyses ◽  
Solid Liquid

Abstract The microporosity formation in a vertical unidirectionally solidifying Al-4.1%Cu alloy casting is modeled in both microgravity and standard gravity as well as in the conditions of decreased (Moon, Mars) and increased (Jupiter) gravity. Due to the unique opportunities offered by a low-gravity environment (absence of metallostatic pressure and of natural convection in the solidifying alloy) future microgravity experiments will significantly contribute to attaining a better physical understanding of the mechanisms of microporosity formation. One of the aims of the present theoretical investigation is to predict what microporosity patterns will look like in microgravity in order to help plan a future microgravity experiment. To perform these simulations, the authors suggest a novel three-phase model of solidification that accounts for the solid, liquid, and gas phases in the mushy zone. This model accounts for heat transfer, fluid flow, macrosegregation, and microporosity formation in the solidifying alloy. Special attention is given to the investigation of the influence of microporosity formation on the inverse segregation. Parametric analyses for different initial hydrogen concentrations and different gravity conditions are carried out.

NICKEL COPPER ALLOYS 505 and 506

Alloy Digest ◽  
1975 ◽  
Vol 24 (2) ◽  
Keyword(s):  
Wear Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
Copper Alloys ◽  
High Strength ◽  
Heat Treating ◽  
Corrosion And Wear ◽  
Alloy Casting ◽  
Resistance Alloy ◽  
Nickel Copper

Abstract Nickel-Copper Alloys 505 and 506 are strong castings alloys. Both alloys combine high strength with good wear resistance. Alloy 505 (4% silicon) is employed where exceptional resistance to galling is needed. Alloy 506 (3% silicon) is recommended where good (but not exceptional) galling resistance is sufficient. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on corrosion and wear resistance as well as casting, heat treating, machining, joining, and surface treatment. Filing Code: Ni-215. Producer or source: Nickel alloy casting producers.

Semisolid Casting of Hypereutectic Al-Si-Cu Alloy with Sono-Solidified Slurry

2014 ◽  
Vol 622-623 ◽  
pp. 804-810 ◽  
Author(s):  
Yoshiki Tsunekawa ◽  
Shinpei Suetsugu ◽  
Masahiro Okumiya ◽  
Yuichi Furukawa ◽  
Naoki Nishukawa ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Eutectic Temperature ◽  
High Strength ◽  
Primary Silicon ◽  
Optical Microscope ◽  
Eutectic Region ◽  
Hetero Structure ◽  
Cu Alloys ◽  
Strength And Ductility ◽  
Silicon Particles

Hypereutectic Al-Si-Cu alloys which are typical light-weight wear-resistant materials, are required to improve the ductility as well as the strength and wear-resistance for the wider applications. Increase in amounts of primary silicon particles causes the modified wear-resistance of hypereutectic Al-Si-Cu alloys, however, it leads to the poor strength and ductility. It is known that dual phase steels composed of hetero-structure have succeeded to bring contradictory mechanical properties of high strength and ductility concurrently. In order to apply the idea of hetero-structure to hypereutectic Al-Si-Cu alloys for the achievement of high strength and ductility along with wear resistance, ultrasonic irradiation to molten metal during the solidification, which is named sono-solidification, was carried out from its molten state to just above the eutectic temperature. The sono-solidified Al-17Si-4Cu alloy is composed of hetero-structure, that is, hard primary silicon particles, soft non-equilibrium α-Al phase and eutectic region. Rheocasting was performed at just above the eutectic temperature with sono-solidified slurry to shape a disk specimen. After the rheocasting with modified sono-solidified slurry held for 45s at 570oC, the quantitative optical microscope observation exhibits that the microstructure is composed of 18area% of hard primary silicon particles and 57area% of soft α-Al phase, in contrast there exist only 5area% of primary silicon particles and no α-Al phase rheocast with normally solidified slurry. Hence the tensile tests of T6 treated rheocast specimens with modified sono-solidified slurry exhibit the improved strength and 5% of elongation, regardless of more than 3 times higher amounts of primary silicon particles compared to that rheocast with normally solidified slurry.

Effects of Mold Temperature and Casting Temperature on Hot Cracking in Al-4.5 wt.% Cu Alloy

2013 ◽  
Vol 747 ◽  
pp. 623-626
Author(s):  
R. Burapa ◽  
S. Rawangwong ◽  
J. Chatthong ◽  
Worapong Boonchouytan
Keyword(s):  
High Resistance ◽  
Copper Alloys ◽  
Mold Temperature ◽  
Hot Cracking ◽  
The Other ◽  
Casting Temperature ◽  
Experimental Conditions ◽  
Cu Alloy ◽  
Aluminum Copper Alloys ◽  
Cracking Tendency

Hot cracking is an important defect that occurs during solidification of aluminum-copper alloys. In this present work, the effects of mold temperature and casting temperature on hot cracking in the Al-4.5 wt.% Cu alloy has been studied using a ring mold for hot cracking assessment. For the experimental conditions, three mold temperatures between 150 and 350°C and three casting temperatures between 670 and 770°C were studied and Al-7 wt.% Si alloy was used as reference for comparison. The results showed Al-7 wt.% Si alloy has high resistance to hot cracking and no hot cracking forms under three different mold temperatures, while Al-4.5 wt.% Cu alloy shows significant hot cracking tendency under the same casting conditions. The severity of hot cracking in Al-4.5 wt.% Cu alloy decreased significantly with increasing the mold temperature and decreasing the casting temperature. On the other hand, an increasing casting temperature resulted in severer hot cracking in Al-4.5 wt.% Cu alloy.

scholarly journals Strengthening Mechanisms in Nickel-Copper Alloys: A Review

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1358
Author(s):  
Olexandra Marenych ◽  
Andrii Kostryzhev
Keyword(s):  
Heat Treatment ◽  
Copper Alloys ◽  
High Strength ◽  
Wire Drawing ◽  
Strengthening Mechanisms ◽  
Processing Technologies ◽  
Cu Alloys ◽  
Excellent Corrosion Resistance ◽  
Nickel Copper ◽  
Marine Vessels

Nickel-Copper (Ni-Cu) alloys exhibit simultaneously high strength and toughness, excellent corrosion resistance, and may show good wear resistance. Therefore, they are widely used in the chemical, oil, and marine industries for manufacturing of various components of equipment, such as: drill collars, pumps, valves, impellers, fixtures, pipes, and, particularly, propeller shafts of marine vessels. Processing technology includes bar forging, plate and tube rolling, wire drawing followed by heat treatment (for certain alloy compositions). Growing demand for properties improvement at a reduced cost initiate developments of new alloy chemistries and processing technologies, which require a revision of the microstructure-properties relationship. This work is dedicate to analysis of publicly available data for the microstructure, mechanical properties and strengthening mechanisms in Ni-Cu alloys. The effects of composition (Ti, Al, Mn, Cr, Mo, Co contents) and heat treatment on grain refinement, solid solution, precipitation strengthening, and work hardening are discussed.

scholarly journals Ultrasonic Vibration as a Primary Mixing Tool in Accelerating Aluminum–Copper Alloys Preparation from Their Pure Elements

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 781
Author(s):  
Abdulsalam Muhrat ◽  
Hélder Puga ◽  
Joaquim Barbosa
Keyword(s):  
Ultrasonic Vibration ◽  
Copper Alloys ◽  
Grain Refining ◽  
Alloying Element ◽  
Experimental Conditions ◽  
Melt Temperature ◽  
Cu Alloys ◽  
Aluminum Copper Alloys ◽  
Main Factor

In this study, ultrasonic vibration (USV) was evaluated in preparation of Al–8wt.%Cu alloys at a lab-scale. Moreover, the role of Ti–6Al–4V sonotrode erosion and its contribution in grain refining were analyzed. Based on the experimental conditions/parameters, it was found that the amount of impurities and the associated porosity were significantly reduced in USV treated alloys. Furthermore, USV reduced the time needed for dissolving the alloying element Cu, nevertheless, the best dissolving of Cu in this study was not possible without introducing further holding time. As a result of using a titanium-based sonotrode, a noticeable content of Ti was found in the ultrasonically treated alloys due to sonotrode erosion under USV. The dispersion of TiAl3 promoted, as a main factor, a grain refining effect at relatively constant and high melt temperature, other possible mechanisms of grain refining have been discussed.

Hot Tearing Susceptibility and Fluidity of Semi-Solid Gravity Cast Al-Cu Alloy

2006 ◽  
Vol 116-117 ◽  
pp. 76-79 ◽  
Author(s):  
J. Wannasin ◽  
David Schwam ◽  
J.A. Yurko ◽  
C. Rohloff ◽  
G. Woycik
Keyword(s):  
Liquid State ◽  
Copper Alloys ◽  
High Strength ◽  
Hot Tearing ◽  
Gravity Casting ◽  
Aluminum Copper Alloys ◽  
Semi Solid ◽  
High Superheat ◽  
Constrained Rod Casting ◽  
Hot Tearing Susceptibility

Aluminum-copper alloys offer both high strength and excellent ductility suitable for a number of automotive applications to reduce vehicle weight; however, the alloys are difficult to cast because of their tendency for hot tearing. In this work, semi-solid gravity casting of an aluminum-copper alloy, B206, was conducted in constrained rod casting molds to study the feasibility of using the process to reduce or eliminate hot tearing. To demonstrate the feasibility of gravity casting of the metal slurries, a fluidity test was also conducted. Results show that the hot tearing susceptibility of the aluminum-copper B206 alloy cast in semi-solid state is lower than those cast in liquid state with high superheat temperatures. The grain size of the semi-solid cast Al-Cu samples appears to be finer than those cast in liquid state with high superheat temperatures. In addition, the metal slurries had sufficient fluidity to fill the molds even with low gravity pressures. The results suggest that semi-solid gravity casting is a feasible process to help reduce hot tearing.

Effect of Alloying Elements on the Strength and Casting Characteristics of High Strength Al-Zn-Mg-Cu Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 2539-2542 ◽  
Author(s):  
Ki Tae Kim ◽  
Jeong Min Kim ◽  
Ki Dug Sung ◽  
Joong Hwan Jun ◽  
Woon Jae Jung
Keyword(s):  
Mechanical Properties ◽  
Base Alloy ◽  
High Strength ◽  
Hot Tearing ◽  
Alloying Elements ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Zr Addition ◽  
Tearing Resistance ◽  
Mgzn2 Phase

Small amounts of various alloying elements were added to a high strength Al-Zn-Mg-Cu alloy and their effects on the microstructure, mechanical properties, and casting characteristics were investigated. Silicon additions with or without extra Mg to the Al-Zn-Mg-Cu alloy could enhance the castability such as fluidity, feedability, and hot tearing resistance significantly while maintaining a high strength. However, in these alloys containing silicon the compositional adjustment was necessary to prevent the Mg2Si phase formation from degrading the precipitation of MgZn2 phase that is responsible for the high strength. Zr addition to the base alloy was also observed to improve the feedability without deteriorating the tensile strength.

Stability of Chemical Order in Ni4Mo Alloy under Fast Electron Irradiation

1977 ◽  
Vol 35 ◽  
pp. 48-49
Author(s):  
R. W. Carpenter ◽  
E. A. Kenik
Keyword(s):  
Copper Alloys ◽  
Range Order ◽  
Local Composition ◽  
Chemical Order ◽  
Cu Alloys ◽  
Ti Alloys ◽  
Void Swelling ◽  
Aluminum Copper Alloys ◽  
Modulated Structures ◽  
The Stability

Short-range order (SRO) or clustering strongly influences swelling in alloys. For example, Al-Cu alloys containing G-P zones, Cu-Ti alloys containing modulated structures, and Ni-Mo alloys containing various degrees of chemical order are all resistant to void swelling caused by displacive irradiation at elevated temperature. Conversely, displacive particle irradiations may change the configuration of local composition variations. When aluminum-copper alloys containing G-P zones are irradiated with 1 MeV electrons a transformation to 'θ' occurs, and the usually observed θ” state is not observed. This paper presents the results of an experimental investigation of order stability in Ni—20 at. % Mo alloys during irradiation with 1 MeV electrons. This alloy is especially useful for studying the stability of order during irradiation because the symmetry of the intensity distribution in reciprocal space corresponding to SRO is quite different from that corresponding to the Dla long-range order (LRO) observed at thermal equilibrium in this alloy.

The Hydrogen Permeability of Sulfur Resistant Palladium-Copper Alloys at Elevated Temperatures and Pressures

2002 ◽  
Vol 752 ◽  
Author(s):  
B. H. Howard ◽  
A. V. Cugini ◽  
R. Killmeyer ◽  
K. S. Rothenberger ◽  
M. V. Ciocco ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Elevated Temperatures ◽  
Copper Alloys ◽  
Hydrogen Permeability ◽  
Sulfur Poisoning ◽  
Pressure Drops ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Pd Alloy ◽  
Order Of Magnitude

ABSTRACTPd-Cu alloys are being considered for hydrogen membrane applications because of their resistance to sulfur poisoning. Therefore the permeance of Pd-Cu alloys containing 53, 60, and 80 wt% Pd has been determined over the 623 – 1173 K temperature range for H2partial pressure drops as great as 2.75 MPa. The results indicate that Pd-Cu alloy composition and thermal history influence membrane permeance. The 60%Pd-40%Cu alloy exhibited very high permeance at 623 K, although both the 53%Pd and 60% Pd alloys exhibited a distinct drop in permeability at higher temperatures due to the transition of the Pd-Cu crystal structure from bcc to fcc. Upon cooling the membrane back to 623 K, the permeability of the 60%Pd alloy was initially an order-of-magnitude less than its initial value, but the permeance increased steadily with time as the Pd – Cu crystal structure slowly reverted to bcc. The fcc 80%Pd alloy was less permeable than the bcc 60% Pd alloy at 623 K, but the 80% Pd alloy was more permeable than the fcc 60%Pd alloy at elevated temperatures.

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