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Articles by M.S. Hamani
Total Records ( 8 ) for M.S. Hamani
  M.S. Hamani and R. Laissaoui
  At the liquid state, on the diagrams (above the line of liquidus), an identical field of liquid solution is usually presented not depending on the type of the diagram of state of solid metal. However, these last years a series of works appeared which directly shows the well defined relation ship of the control of the liquid and the variation of these properties (viscosity, surface tension, conductibility electric and different) with the nature and the type of the diagram of state, these characteristics finds an image and emerges from the lines, dividing the common pole of the liquid state on various fields, which is characterized a dependent given energy with the particles of the components thus binding the various properties of liquid alloy. The properties of alloys containing copper in the liquid state are studied in several works. However, currently, the volume of information is not sufficient for all the characteristics of these alloys. The number of the data on the density, viscosity, surface tension, and other physicochemical properties of liquid copper alloys did not find for the moment of use practical. In this present work, we studied the most important physicochemical properties of principal liquid alloys containing copper (Cu-Sn, Cu-Zn).
  M.S. Hamani and D.E. Hammoudi
  The good quality of the castings out of copper alloys is related particularly to the interest which it is necessary to carry on the elimination of the hydrogen which exerts a negative influence on the properties of liquid alloys. The speed of the absorption of nitrogen and its elimination of liquid alloy decreases appreciably in the presence of low contents of active substances. In our work studies on the influence of certain factors are presented on the kinetics of the elimination of hydrogen starting from copper and its alloys. For the study one chose pure copper, copper with the additions of phosphorus 0.01 and 0. 04%, of tin 10% and nickel 10%, i.e. with components, having various surface activities.
  M.S. Hamani , D.E. Hamoudi and A.Hafsaoui
  At the liquid state, on the diagrams (above the line of liquidus), an identical field of liquid solution is usually presented not depending on the type of the diagram of state of solid metal. However, these last years a series of works appeared which directly shows the well defined relation ship of the control of the liquid and the variation of these properties (viscosity, surface tension, conductibility electric and different) with the nature and the type of the diagram of state, these characteristics finds an image and emerges from the lines, dividing the common pole of the liquid state on various fields, which is characterized a dependent given energy with the particles of the components thus binding the various properties of liquid alloy. The properties of alloys containing copper in the liquid state are studied in several researches. However, currently, the volume of information is not sufficient for all the characteristics of these alloys. The number of the data on the density, viscosity, surface tension and other physicochemical properties of liquid copper alloys did not find for the moment of use practical. In this present work, we studied the most important physicochemical properties of principal liquid alloys containing copper (Cu-Pb, Cu-Si, Cu-Al).
  D.E. Hamoudi , S. Chabour , A. Lemmoui and M.S. Hamani
  In order to fill the cavity with a mould, entering metal must have heat required. The reduction in the temperature of the fluid passing by the system of release must be adapted in the treatment in order to make it possible the liquid to completely fill the interstices of the mould. The use of the fluidity of the molten metal like concept and variable of treatment to define the conditions of payment of metal was constant in the technical literature. Basic tests are employed to determine this parameter of thermal transfer in liquid metal operations, provided an occasion more particularly to define the behaviour of the molten metals in the moulds filled. These concepts presented by researchers, consider the loss of temperature of the molten metal while it crosses the system of release. The development of this model is based on a calculation of the loss of heat of the molten metal are equivalent to a tube with the models of release of these systems which accentuate by the unstable nature of the loss of heat reviewed. The computer simulation of this analysis was described by other researchers. The development of a model of unstable state is given where the system of release is simplified with an equivalent tunnel of flow by material of the mould. Local flows of heat are a function of time and the temperature of each metal increment can be given as soon as it enters the mould. The loss of heat in the system of release is the first stage by determining a first distribution of the temperature in the mould for the computer simulation of the concepts of solidification of the mould similar to those used to evaluate the loss of heat in the system of release can be employed to determine the initial temperature in the mould on the achievement of the filling of the mould. The incorporation of these concepts in the computer-aided design for moulds is necessary. What relates to the molten metal, Holman for example presented an analysis for the loss of the temperature by holding molten steel which is applicable to other metals.This review presented developments by quantitatively evaluating the losses of heat in the filling of the mould. It would prove that the quantitative aspects of the thermal transfer in the treatment of the molten metal were developed and checked in experiments. The current task is to integrate these results and to install them in a system computerized for the design of the mould of production. The fall of the temperature of the molten metal in the mould is taken into account. Several concepts and analyses having milked on the subject are presented. The use of the quantitative aspects in the evolution of the simulation computer-assisted for the design of the components is recommended.
  A. Lemmoui , M. Labaiz , M.S. Hamani , D.E. Hamoudi and R. Laissaoui
  The simulation of the filling and the solidification of thefoundingpartsis an essential stage to optimize the design of the moulds. The following one is even more in order to be able to predict in same time the level of the defects in the parts. The research concerns the study of the filling of the mould in order to determine its influence on the solidification of cast alloy. We established a calculation programme which makes it possible to simulate the filling of our mould starting from the flow of the liquid at exit of the crucible.The simulations results required the adaptation ofmeshing of the considered problem. The results of these simulations made it possible to define the quantity of the liquid present in each element at every moment at various speeds of casting.Our study includes the determination of the influence of the various considered parameterson the resulting thermal field. In our particular mould, it appeared that the speed of casting is the parameter which controls the phenomenonfacing the temperatures of pre-heating of the mould the and alloy melt.
  D.E. Hammoudi , M.S. Hamani and M.C.Djouamaa
  One can that the indudtry of cast iron foundry manufactures invisible products, no matter what vital, then that they are machined before becoing the components of machines where equipment for all industries. The knowledge of the pig iron and cast iron is not thing simple, complex are the phenomena which accompany, as well solidification as cooling in a solid state such alloys and complex also are the effects, on the pace of the solid product cold. Various components elements the castiron and can obstained satisfactory results, only the founders who inculed/understand prefectly, which occurs in the mould. The addition of alloy element suitable in the pig iron and cast iron makes it possible to modify the structure and to still improve the mechanical, physical characteristics...etc. Thus, one goes, one studied the influence of the mechanical properties and the distribution of the elements between the structural components according to the section of the cylinders at the speed of their cooling.
  M.S. Hamani and M.C. Djouama
  The creation of new materials of high resistance and low density is one of the main important concerns of metallurgists, in view of the aeronautic evolution. The aluminium alloys, with lithium, present a particular interest because they represent a gain of weight of 10-15% and offer a good rigidity and ameliorated characteristics. In different cases, the use of these alloys is better than composite materials or other alloys of other systems. Unfortunately, they gain technologic casting properties and consequently, they complicate their putting into form. In the first step, this work is a study of the influence of the addition of elements (Cu, Mg, Li), the modification agents (Ti, Zr, Sc) and impurities(Fe, Si, Ca, Na and other) on linear shrinkage, on the aptitude at the hot and the cold creek formation and the alloy structure of Al-Li-Mg and Al-Li-Cu systems. Then, the study optimizes the chemical composition of the alloys of the examined systems in the aim to increase the strength at the creek formation and the homogeneous wheat obtaining. The influence of the principal allied elements on the susceptibility at the creek formation and the linear shrinkage of the alloys of the Al-Li-Mg and Al-Li-Cu systems. The modification of the alloys of Al-Li-Mg by the addition of Zr and Sc is an efficient mean against the shrinkage on grain. Practically, a recommendation had been proposed on the optimization of the chemical composition of the alloys, according to their principal addition elements, modified by the additives and the impurities in the aim to diminish their fragility by the heat susceptible to the formation of the cold creek and the obtaining of fine grains of homogeneous structure. The application of this recommendation allows diminish or to eliminate totally the scandium grade uncertain alloys.
  M.S. Hamani , F. Hamidane and M.C. Djouama
  In this research we studied the influence of the heat treatments of structural hardening on the evolution of the mechanical and structural properties of AS7G06 alloy gracefully provided by the foundry division of Rouïba (located in the center of Algeria) the aim of this work is to study the aptitude to hardening of AS7G06 alloy. Therefore, we carried out the application of a variety of heat treatment cycles. The result which we search is to determine the of the structural treatment parameters which offer to our alloy the highest hardening level and the adequate structure. The various experimental tests and the results obtained, on the studied alloy show an acceptable increase in the properties; therefore, the structural hardening enabled us to reach our objective; and that is confirmed by the various techniques of investigation previously described.
 
 
 
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