scholarly journals Prediction of Cracking Susceptibility of Commercial Aluminum Alloys during Solidification

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1479
Author(s):  
Fan Zhang ◽  
Songmao Liang ◽  
Chuan Zhang ◽  
Shuanglin Chen ◽  
Duchao Lv ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Cooling Rate ◽  
High Throughput ◽  
Simulation Method ◽  
Calphad Method ◽  
Back Diffusion ◽  
Simulation Tool ◽  
Complex Phenomenon ◽  
Theoretical Methods ◽  
Index Maps

Cracking during solidification is a complex phenomenon which has been investigated from various angles for decades using both experimental and theoretical methods. In this paper, cracking susceptibility was investigated by a simulation method for three series of aluminum alloys: AA2xxx, AA6xxx, and AA7xxx alloys. The simulation tool was developed using the CALPHAD method and is readily applicable to multicomponent alloy systems. For each series of alloys, cracking susceptible index values were calculated for more than 1000 alloy compositions by high-throughput calculation. Cracking susceptible maps were then constructed for these three series of aluminum alloys using the simulated results. The effects of major and minor alloying elements were clearly demonstrated by these index maps. The cooling rate effect was also studied, and it was concluded that back diffusion in the solid can significantly improve the cracking susceptibility.

Microstructure and Properties of Rapidly Solidified Al-Zn-Mg-Cu Alloy

2020 ◽  
Vol 993 ◽  
pp. 203-207
Author(s):  
Wei Min Ren ◽  
Zi Yong Chen ◽  
Zhi Lei Xiang ◽  
Li Hua Chai
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Cooling Rate ◽  
Rapid Solidification ◽  
Second Phase ◽  
Alloy Strip ◽  
Roller Speed ◽  
Microstructure And Properties ◽  
Cu Alloy ◽  
Rapidly Solidified

Refining grain plays an important role in improving the mechanical properties of aluminum alloys. However, the conventional casting method with a slow cooling rate can be easy to cause coarseness of the microstructure and serious segregation. In this paper, the rapid solidification of Al-Zn-Mg-Cu alloy was prepared by the single-roller belt method. The alloy strip was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and hardness test to study the microstructure and properties of the rapidly solidified aluminum alloy. The results show that the roller speed was an important parameters affecting the formability of the alloy. When the roller speed was 15 m/s, the aluminum alloy produced a thin bandwidth of 5 mm and a thickness of 150 um. As the rotation speed of the roller increased, the cooling rate of the melt increased, and the microstructure of the rapidly solidified Al-Zn-Mg-Cu aluminum alloy strip improved in grains refinement. Compared with the conventionally cast Al-Zn-Mg-Cu aluminum alloys, the Al-Zn-Mg-Cu aluminum alloys prepared by rapid solidification showed much finer crystal grains, and enhanced solid solubility of alloying elements with less precipitation of second phase and high hardness.

Thermodynamic Calculation of the Liquidus Projections of the Al-Cu-Fe-Mg, Al-Cu-Mg-Si, and Al-Fe-Mg-Si Quaternary Systems on Al-Rich Corner

2020 ◽  
Vol 993 ◽  
pp. 1031-1042
Author(s):  
Jing Rui Zhao ◽  
Yong Du ◽  
Li Jun Zhang ◽  
Shu Hong Liu ◽  
Jin Huan Xia ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aluminum Alloys ◽  
Liquidus Projection ◽  
Thermodynamic Calculation ◽  
Theoretical Basis ◽  
Solidification Process ◽  
Material Design ◽  
Calphad Method ◽  
Quaternary Systems ◽  
Solidification Simulation

The thermodynamic calculations of Al-Cu-Fe-Mg, Al-Cu-Mg-Si and Al–Fe–Mg–Si quaternary systems were carried out using CALPHAD method, based on the Al–Cu–Fe–Mg–Si thermodynamic database. The liquidus projection of Al–Cu–Fe–Mg, Al–Cu–Mg–Si and Al–Fe–Mg–Si quaternary systems at Al-rich corner were constructed, and the solidification structures of Al-12Cu-7Mg-1Fe, Al-14Cu-2Mg-4Si, Al-0.3Fe-6Mg-12Si (wt.%) alloys were analyzed by the Scheil solidification simulation. The calculated results agree well with the previous experimental data. The liquidus projections of three quaternary aluminum alloys at the Al-rich corner were accurately plotted, which could be helpful for the analysis of solidification process of multicomponent alloy systems, and provide an important theoretical basis for the material design of aluminum alloys.

On a Methodology for Establishing the Machine Tool System Requirements for High-Speed/High-Throughput Machining

1985 ◽  
Vol 107 (4) ◽  
pp. 316-324 ◽  
Author(s):  
R. Komanduri ◽  
J. McGee ◽  
R. A. Thompson ◽  
J. P. Covy ◽  
F. J. Truncale ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Machine Tool ◽  
High Throughput ◽  
Machine Tools ◽  
High Speed ◽  
Cutting Speed ◽  
Tool Material ◽  
Higher Power ◽  
Increase Productivity ◽  
System Requirements

This paper presents a methodology for determining the machine tool system requirements for high-speed machining (HSM)/high-throughput machining (HTM). Both technological and economic factors should be considered in the formulation of the model for determining machine tool system requirements. The HSM function model is given here in the form of ICAM-defined (IDEFo) charts with corresponding text. For machining most aluminum alloys, the maximum cutting speed is not limited by tool life, and the technology for high-speed machine tools (spindles, table drives, controls, chip management, and other features) exists today. Therefore, HSM of aluminum alloys can be implemented. Selection of a suitable HSM system involves detailed technological analysis and economic justification for a given part-family production configuration. The recent introduction of Si3N4 based tool materials has enabled significantly higher cutting speeds (up to 1524 mpm or 5000 sfpm) in the machining of gray cast iron. However, the machine tools using this type of tool material should be more rigid and capable of higher power, higher speed, and faster feed in order to increase productivity and reduce manufacturing costs. In the machining of the difficult-to-machine materials (e.g., superalloys), the cutting speed is still limited by tool wear. Nevertheless, a high-throughput machining (HTM) strategy is pertinent for this application.

Numerical Simulation of Feeding Powder Laser Cladding Temperature Field Based on ANSYS

2013 ◽  
Vol 690-693 ◽  
pp. 3334-3337
Author(s):  
Cheng Fa Song ◽  
Ming Di Wang
Keyword(s):  
Numerical Simulation ◽  
Cooling Rate ◽  
Laser Cladding ◽  
Simulation Method ◽  
Conduction Model ◽  
Beam Position ◽  
Life And Death ◽  
Laser Cladding Process ◽  
Calculation Results ◽  
Cladding Layers

The numerical simulation method of LCRM Using Coaxial Inside-Beam Powder Feeding is put forward in this page. LCRM conduction model is established, the life and death unit to be used to simulate the real laser cladding process. Calculation results show that the molten pool temperature will gradually increase with the number of cladding layers increase; the highest temperature at the point of application of the laser beam position later; in the cladding process, cooling rate is great in high temperature period, and in low temperature section, cooling rate relatively slight.

Microstructural Evolution during Ingot Preheat in 7xxx Aluminium Alloys for Thick Semiproduct Applications

2006 ◽  
Vol 519-521 ◽  
pp. 549-554 ◽  
Author(s):  
Seong Taek Lim ◽  
Yong Yun Lee ◽  
Il Sang Eun
Keyword(s):  
Aluminum Alloys ◽  
Cooling Rate ◽  
Temperature Interval ◽  
Microstructural Evolution ◽  
Aluminium Alloys ◽  
S Phase ◽  
Constitutional Change ◽  
Preheat Temperature ◽  
Quaternary Phase ◽  
M Phase

Recent 7xxx aluminum alloys have been designed for the finite use of thick semiproduct with contolled amount of constituent phases which mostly evolve during ingot preheat. In this study, the effects of constitutional change and preheat conditions of 7175 and 7050 type alloys on the evolution of constituent phases [M-, T-, S-phase and dispersoid] are presented. The constiuents evolve depending on the constitutional effect, primarily the change of Zn:Mg ratio, preheat condition comprising temperature and cooling rate following preheat. T- and M-phase are reprecipitated during cooling after preheat, depending on the alloy constitutions. S-phase is evolved depending on the constitution and preheat temperature, rather than preheat cooling rate. Prominent precipitation temperature interval of constituents are discussed in view of quaternary phase evolutions. In addition, evolutions of dispersoids together with M-phase are discussed. Specific alloy designs and preheat conditions could provide controlled microstructures for the thick 7xxx semiproducts.

scholarly journals Designing the Re-layout Finished Goods Warehouse through the Simulation Method

2021 ◽  
Vol 10 ◽  
pp. 126-137
Author(s):  
Nurfarahainie Abidin ◽  
Ahmad Afif Ahmarofi ◽  
Anderes Gui
Keyword(s):  
Simulation Method ◽  
Health Facilities ◽  
Personal Hygiene ◽  
Sudden Increase ◽  
Simulation Tool ◽  
Public Place ◽  
The Public ◽  
Laboratory Facilities ◽  
Production Output

The demand for gloves is increasing currently and mostly used in health facilities such as hospitals and clinics. Furthermore, laboratory facilities such as in university and schools also use gloves to handle equipment in the laboratory. Since pandemic Covid-19, personal hygiene emerged as the main concerned. Hence, not only the person who works in health facilities and laboratory, everyone used gloves, especially in the public place. Consequently, gloves demand is increasing tremendously. However, the manufacturer who produces gloves is suffering insufficient capacity in the goods warehouse due to a large number of production output. In this regard, this paper aims to improve one of the finished goods warehouse capacity that highly affected by the sudden increase in demand. An improvement of finished goods warehouse layout was developed by using a simulation tool to solve the lack of available space. It is found that the proposed layout can be fully utilized in the warehouse, thus increase the warehouse capacity efficiently.

scholarly journals Determination of Gamma-Ray Shielding Parameters for Concretes and Dosimeters Using MCNPX

2020 ◽  
Vol 8 (1) ◽  
pp. 73-79
Author(s):  
V. P. Singh ◽  
Huseyin Ozan Tekin
Keyword(s):  
Large Scale ◽  
Gamma Ray ◽  
Simulation Method ◽  
Radiological Protection ◽  
Simulation Tool ◽  
Alternative Method ◽  
Standard Geometry ◽  
Good Agreement

Gamma-ray shielding parameter for some concretes and dosimeters having large scale applications in radiological protection are presented using MCNPX (version 2.4.0) at different energies. The MCNPX results are compared with experimental, MCNP and XCOM data, and good agreement is being noted. Present study indicates that MCNPX simulation method is suitable and reliable simulation tool to be used as an alternative method for the investigation of gamma-ray interaction. The present geometry can be used as standard geometry for MCNPX simulation for low- as well as high-Z materials.

scholarly journals Influence of thermal parameters on the dendritic arm spacing and the microhardness of Al-5.5wt.%Sn alloy directionally solidified

2014 ◽  
Vol 67 (2) ◽  
pp. 173-179 ◽  
Author(s):  
Angela de Jesus Vasconcelos ◽  
Cibele Vieira Arão da Silva ◽  
Antonio Luciano Seabra Moreira ◽  
Maria Adrina Paixão de Sousa da Silva ◽  
Otávio Fernandes Lima da Rocha
Keyword(s):  
Growth Rate ◽  
Aluminum Alloys ◽  
Cooling Rate ◽  
Thermal Parameters ◽  
The Other ◽  
Directionally Solidified ◽  
Dendritic Microstructure ◽  
Dendritic Network ◽  
Dendritic Arm Spacing ◽  
The Relationship

Al-Sn alloys are widely used in tribological applications. In this study, thermal, microstructural and microhardness (HV) analysis were carried out with an Al-5.5wt.%Sn alloy ingot produced by horizontal directional transient solidification. The main parameters analyzed include the growth rate (V L) and cooling rate (T R).These thermal parameters play a key role in the microstructural formation. The dendritic microstructure has been characterized by primary dendritic arm spacing (λ1) which was experimentally determined and correlated with V L, and T R. The behavior presented by the Al-5.5wt.%Sn alloy during solidification was similar to that of other aluminum alloys, i.e., the dendritic network became coarser with decreasing cooling rates, indicating that the immiscibility between aluminum and tin does not have a significant effect on the relationship between primary dendritic arm spacing and the cooling rate. The dependence of the microhardness on V L, T R and λ1 was also analyzed. It was found that for increasing values of T R, the values of HV decrease. On the other hand, the values of HV increase with increasing values of λ1.

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