The influence of alloy composition on microstructure and tensile behaviour of copper-lead alloys

Lead is a soft metal that possesses excellent antifriction and lubricating characteristics and is a desired addition to alloys which find use in friction-critical and low-load-bearing applications. The influence of alloy composition on microstructure, tensile properties and quasi-static fracture behaviour has been studied. Alloy composition, that is, lead content, was observed to have an influence on the size and distribution of lead globules in the copper matrix. The yield strength, ultimate tensile strength and elastic modulus of the alloy decreased with increase in lead content. The ductility of the alloys showed an improvement with increase in lead content. The influence of lead content on quasi-static fracture is discussed in detail.     

The influence of the nature of the depolarizer on the positive and negative maxima of the first kind

Polarographic maxima studies of Cu Pb, Zn and Mn systems in sodium nitrate revealed that character and magnitude of maximum was associated with the nature of the electroactive cation through the relationship of its E_1/2 to point of zero charge (pzc).     

Time-Dependent Behavior of Ceramic (Zirconia)-Metal (NiCoCrAlY) Particulate Composites

The estimation of time-dependent properties for ceramic-metal mixturesis important for analyzing the effects of thermal loading oncompositionally graded thermal barrier coatings. A mean fieldmicromechanics approach is developed to compute effective time-dependentproperties of ceramic (zirconia)-metal (NiCoCrAlY) particulate compositematerials. These properties are then used to predict the transientthermal stresses in these composites when they are subjected to thermalshock. These thermal stresses include the effects of time-dependentmaterial response.     

An Investigation of Carbon Content and Consolidation Temperature on Microstructure and Properties of Hafnium Boride Ceramic

This paper discusses the use of Plasma Pressure Compaction to consolidate hafnium diboride powders. The effect of carbon addition on densification was studied. The influence of consolidation temperature on microstructure, density, and hardness of the bulk sample is presented. The interrelationship between microstructure and properties of the bulk sample are rationalized in light of the intrinsic influence of carbon content and the extrinsic influence of consolidation temperature.