Properties Of Brass Research Articles

Relation Between Parameters of Indirect Texture Control and Properties of Brass and Improvement of the Quality of Rolled Products by Using Statistical Methods of Analysis and Advanced Online Management

Relation Between Parameters of Indirect Texture Control and Properties of Brass and Improvement of the Quality of Rolled Products by Using Statistical Methods of Analysis and Advanced Online Management

Morphology evolution and agglomeration mechanism of Fe5Si3 precipitated phase after Fe[sbnd]Si microalloying and its effect on the properties of brasses

The regeneration of scrap brass is affected by the impurity elements in raw materials. It is of practical significance to clarify the interaction of trace elements in brass melt for efficient recovery of scrap brass. The effect of FeSi microalloying on microstructure evolution and properties of as-cast H62 brass was investigated in the present study. The experimental results indicated that the microstructure of H62 brass containing 0.4 wt% Fe changed obviously after the introduction of silicon element. The volume fraction of Fe-rich phase increased with the increase of Si content, and the introduction of Si intensified the agglomeration behavior of Fe-rich phase. The thermodynamic analysis indicated that the silicon showed strong reactivity and bonding ability, and theoretical calculation suggested that silicon preferentially bonded with iron in melt to form new atomic clusters. The introduction of silicon also changed the morphology of the precipitated phase. The influence of silicon addition on the morphology evolution of FeSi precipitated phase was studied. The above reasons should be responsible for the microstructure evolution of as-cast brass. In addition, the mechanical properties and electrical conductivity of the microalloyed brass were tested. This study provides a new insight into the regulation of microalloying elements in regenerated brass.

The Effect of the Addition of Tuff on the Properties of Brass and Bronze

The article presents studies aimed at identifying the effect of the addition of volcanic tuff, rocks with ceramic properties, on the properties of brass and bronze, which make up the metal matrix of the composite. The research methods included: structure study (microscopic observations using an optical microscope and a scanning microscope), EDS analysis, as well as testing of composites for abrasion and microhardness. The results of the study of samples formed by tuff with brass and bronze show the stability of the structures obtained. Microscopic observations confirm that the distribution of mineral filler particles is uniform. No significant gaps were found between the filler and the matrix. The results of mechanical abrasion tests were the best and the maximum increase in hardness values was achieved with 10% addition of tuff to brass and bronze matrices

Effect of Silane Coupling Agent Modification on Properties of Brass Powder-Water-Based Acrylic Coating on Tilia europaea

Fine art coating is usually created by the combination of metal filler and water-based coatings, decorated to the surface of wood structures, furniture, and crafts. However, the durability of the fine art coating is limited by its weak mechanical qualities. In contrast, the metal filler's dispersion and the coating's mechanical properties can be significantly improved by the coupling agent molecule's ability to bind the resin matrix with the metal filler. In this study, a brass powder-water-based acrylic coating was prepared, and three different silane coupling agents, 3-aminopropyltriethoxysilane (KH550), γ-(2,3-epoxypropoxy)propytrimethoxysilane (KH560), and γ-methacryloxypropyltrimethoxysilane (KH570), were used to modify the brass powder filler in orthogonal tests. The artistic effect and optical properties of the modified art coating induced by different proportions of brass powder, silane coupling agents, and pH were compared. The result demonstrated that the amount of brass powder and the kind of coupling agent used had a substantial impact on the coating's optical characteristics. Our results also determined how three different coupling agents affected the water-based coating with varying brass powder contents. The findings indicated that 6% KH570 concentration and pH 5.0 were the ideal conditions for brass powder modification. Better overall performance of the art coating applied to the surface of the Basswood substrates was provided by adding 10% of the modified brass powder into the finish. It had a gloss of 20.0 GU, a color difference of 3.12, a color main wavelength of 590 nm, a hardness of HB, an impact resistance of 4 kg·cm, an adhesion of grade 1, and better liquid resistance and aging resistance. This technical foundation for the creation of wood art coatings promotes the application of art coatings on wood.

Effect of Deformation by High-Pressure Torsion in a Combined Matrix on the Properties of Brass

Effect of Deformation by High-Pressure Torsion in a Combined Matrix on the Properties of Brass

Effects of Aluminum and Manganese Addition on the Microstructures and Mechanical Properties of Cu-29Zn Alloys

Brass with Zn content up to 35 wt.% forms the single phase of α, further the Zn content above 35 wt.% will promotes the formation of β phase. The improvement of physical and mechanical properties of brass can be conducted by addition of alloying element with optimum composition. Previous research showed that the addition of Al on brass alloy accelerated the formation of β phase and changed the microstructure and mechanical properties. Some investigation have also described that the addition of Mn on brass alloy has the good effect on tensile strength, hardness, and elongation. However, the research regarding the effect of Al and Mn addition simultaneously has not been investigated. In this research, Cu-29Zn-xAl-xMn alloys were produced by gravity die casting using pure Cu, Zn and Al ingots as well as the Mn powder as the feeding materials. Addition of Al and Mn were fixed to 0.5 and 2 wt.%, respectively. The molted metal was poured into 600 °C preheated metal mold with dimension of 100x100x6 mm3. As-cast samples were homogenized at 800 °C for 2 h in a muffle furnace. Samples characterization includes chemical composition analysis, microstructure observation, tensile and hardness testing. The results described that addition of 0.58 Al (wt.%) on Cu-29Zn alloy showed the appearance of single phase (α) and tended to increase the tensile strength but decreased the elongation. On the other hand, the addition of 0.5 Al and 1.62 Mn (wt.%) simultaneously on Cu-29Zn alloy promoted the formation of second phase (β) which dispersed in the grain and along the grain boundary with irregular forms. The addition of 0.5 Al and 1.62 Mn (wt.%) on Cu-29Zn alloy simultaneously have also increased the hardness, yield and tensile strength without decreased the elongation significantly.

Crystallographic anisotropy in surface properties of brass and its dependence on the electron work function

The crystallographic anisotropy of the electric current or conductance, adhesive force, elastic modulus, and deformation magnitude of alpha brass were investigated through property mapping using an atomic force microscope. Surface electron work functions of differently oriented grains in the brass were also analyzed using atomic force microscopy. The mapped surface properties are closely related to the electron work function; the work function reflects the surface activity, which is itself dependent on the surface energy. The anisotropy of the properties is closely correlated to thein situmeasured surface electron work function. It is demonstrated that crystallographic planes with higher electron work functions exhibit lower current, smaller adhesive forces, larger elastic moduli and smaller deformation magnitudes. Efforts are made to understand the relationships by connecting the properties with surface energy and electron work function. The dependence of the properties on crystallographic orientation can be elucidated by considering the surface electron behavior using electron work function as a novel probing parameter.

Properties of Brass under Different Pouring Temperatures in Sand Casting Process

This study aimed to determine the toughness of casts produced by the sand casting process at various temperatures against brass, and to investigate the structure contained in the cast madeusing abrass metal mould. This study was experimental research that observed the results of a treatment applied to a specimen group. This pre-experimental study usedthe one-shot case study model in which a group of samples was given treatment. The results showed that the specimen poured at 900°C exhibiteda microstructure consisting ofgood Cu-Zn content, while that at 700°Chad the least Cu content. It indicates that the higher the temperature used for metal casting (brass), the more brittle the cast. The toughness of the materialwas influenced by the alloy composition and the pouring temperature of each specimen; the higher the pouring temperature, the better the treatment of alloy. The photomicrographs indicate that the higher the pouring temperature usedin the metal casting (brass), the lesser the carbon element contained in the material.

Effect of Tomato Juice on Electrochemical Properties of Brass, Galvanized and Stainless Steel

Tomatoes (Lycopersicon esculentum), is a fleshy berry regarded as very popular perishable fruit as well as vegetable grown throughout the tropical and temperate regions of the world. This research work investigated the effect of tomato juice on the electrochemical properties of brass, galvanized and stainless steel using potentiostatic polarization method and weight loss technique at room temperature. The samples were cut into sizes, 2 cm by 2 cm for galvanized and stainless steel, while brass a cylindrical shape of 2.5 mm diameter was cut into 5 cm height, the cut metallic samples was weighed using a sensitive weighing balance and recorded. The pH of the tomato juice was measured and the cut metallic samples were immersed into the containers filled with tomato juice and exposed for a period of 30 days. Weight losses of samples and pH of the tomato juice were determined at an interval of 5 days and the corrosion rates were evaluated. The results showed that brass and stainless steel had very low corrosion rates which decreased with time. High corrosion attack was observed on the galvanized steel and this is shown by the high corrosion current density and corrosion rate obtained on the polarization curve showing active corrosion reaction properties. The pH of the tomato progressed to neutrality within five days and to alkalinity at the end of the thirty days test for galvanized steel while the pH of the tomato juice was less acidic at the end of the thirty days test for both brass and stainless steel. Stainless steel was confirmed as best storage material for tomato juice in this study.Keywords: Corrosion, electrochemical, potentiostatic polarization, weight loss, tomato, metal

Study on microstructure and properties of brass containing Sb and Mg

A novel free-cutting unleaded brass containing antimony and magnesium was prepared by gravity casting and hot extrusion. Microstructure of the hot extruded Sb-Mg brass was studied with scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS). Its mechanical properties were measured by tensile test, and cutting performance was investigated by lathe turning experiment. Results showed that microstructure of the hot extruded Sb-Mg brass was composed of α, β phases and Sb-Mg containing intermetallic compounds. The newly developed brass was compared with the HPb59-1 brass for its mechanical property. Its cutting performance was close to that of a German free-cutting unleaded brass. Sb-Mg brass has potential to replace HPb59-1 brass so as to reduce cost and protect environment.

Mechanical, electrochemical and tribological properties of nanocrystalline surface of brass produced by sandblasting and annealing

Mechanical, electrochemical and tribological properties of nanocrystalline surfaces of a brass alloy (70–30) produced by sandblasting and annealing were investigated. The grain size of a nanocrystalline surface was determined by means of optical microscopy and transmission electron microscopy. The relationships between the grain size of a surface and its properties were investigated using nano-/micro-indentation, micro-scratch, electrochemical scratch and polarization techniques. It was demonstrated that the surface hardness and elastic behavior were improved as the grain size decreased, leading to markedly enhanced wear resistance. The efficiency of hardening by reduction of grain size became lower in the nanocrystalline region, compared to that in the microcrystalline region. The potentiodynamic polarization test indicated that the nanocrystalline surface had higher resistance to corrosion. Nano-indentation and micro-scratch test with in situ monitoring changes in contact electrical resistance demonstrated that the nanocrystallization was significantly beneficial to the mechanical behavior of the passive film. Mechanisms responsible for the beneficial effects of nanocrystallization on properties of brass and its passive films are briefly discussed.

Dynamic Constitutive Equations and Behaviour of Brass at High Strain Rates

This paper presents an experimental study of the mechanical properties of brass at high strain rates. The brass tested is the copperzinc alpha-beta and beta two-phase alloy in the cold-worked state. Experiments were conducted using an extended tension split Hopkinson bar apparatus. It is found that, at lower strain rates, the stress-strain curve is smooth, exhibiting no well-defined yield stress, but at higher strain rates the stress-strain curve not only shows a well-defined yield stress but also displays a very pronounced drop in stress at yield. The flow stress is found to increase with increasing strain rate, but the increase is more significant for the yield stress than for the flow stress, showing that the yield stress is more sensitive to the strain rate than the flow stress away from the yield point. Based on the experimental results, empirical strain-rate-dependent constitutive equations are recommended. The suggested constitutive equations provide a reasonable estimate of the strain-rate-sensitive behaviour of materials.

Norman J. Petch and his Contributions to Materials Science

AbstractNorman Petch was trained in chemistry at Queen Mary College in London, in metallurgy at Sheffield, and in physics at the Cavendish Laboratory, University of Cambridge. The quantitative nature of his crystallographically-based earliest papers, dealing with the positions of iron and carbon atoms in steel, very probably contributed to the meticulous nature of his follow-on mechanical properties research, initially, into the influence of polycrystal grain size on the plastic yielding and fracturing behavior of iron and steel materials at low temperatures. This work, that was complementary to studies of the yield point behavior of steel by his Cambridge colleague, E.O. Hall, led to the well-established Hall-Petch equation for the stress dependence on reciprocal square root of average grain diameter; perhaps, the most widely quoted equation in materials science. Norman Petch's research, with students and colleagues, led on to predictive and/or interpretive Hall-Petch connected relations for the influence of carbon on the friction stress of steel, hydrogen embrittlement influences on the yield and fracture of steel, the ductile-brittle transition behavior of iron and steel and related materials, the plastic deformation properties of brass and aluminum materials, and the fracturing behavior of ceramic materials and laminated composites.

Mechanical and cohesion properties of brass plated steel cords in a sulphurizing environment

The mechanical and cohesion properties of brass plated steel cords have been investigated in dry hydrogen sulphide between 25 and 450° C. The extents of elastic and plastic regions, obtained from slow strain rate technique data have been defined, and the preferential site of decohesion tends to be the brass-steel interface.

The solubility of cerium in copper and its effect on the properties of brasses

1. It was found that the addition of rare earth metal (0.03–0.1%) raises the ductility of copper and its alloys. 2. The solubility of cerium in copper does not exceed 0.05% at 20°C. 3. A zone of high ductility for LS64-2 brass and the widening of the zone for hot working of LS59-1 brass can be used to work the brass at a higher rate and thus raise the annual output.

Application of similarity criteria in physicochemical mechanics of materials

It is shown that dimensional analysis (π-theorem) can be successfully used to derive a criterial equation that will enable us to cope with the influence of the size factor in studies of the effect of the physicochemical action of mercury on the mechanical properties of brass. This opens up new possibilities of simulating complex processes of the physico-chemical mechanics of materials under laboratory conditions for the purpose, for instance, of assessing the time-to-rupture of parts operating under stress in active media, or determining the dimensions of such parts for a predetermined service life.