Magnesium tensile property

Table 4.67 Nominal composition, typical tensile properties and characteristics of selected magnesium casting alloys... 

Table XV. Effect of Deacidification with Magnesium Carbonate for Thirty Minutes on the Tensile Properties of Six U.S. Geological Survey Maps and a Civil War Map...

The effect of zinc stearate concentration on the room temperature tensile properties of the zinc, barium, and magnesium ionomers is illustrated in Figure 5. Whereas stearic acid showed little or modest improve-... 

The plasticizing effects of a larger number of metal stearates on the zinc sulfonate ionomer were examined, and the results are given in Table III in terms of flow and mechanical properties. Lead stearate, zinc stearate, and ammonium stearate significantly improved melt flow along with the stearic acid control. The barium, magnesium, sodium, lithium, and calcium stearates showed little, if any, improvement in melt flow. Of the four melt flow improvers, both stearic acid and ammonium stearate exerted deleterious effects on tensile properties. Only the zinc and lead stearates substantially improved tensile properties. Thus, while zinc stearate is not unique, the number of fatty acid derivatives that improve both melt flow and mechanical properties is limited. 

Magnesium has a density lower than Al, but is more susceptible to corrosion and like Al, requires a protective treatment. Katzman [59] examined suitable treatments for the fabrication of graphite reinforced Mg composites. The tensile properties of coated carbon fiber reinforced Mg composites have been determined by Zhang and co-workers [90]. A study of the compatibility between PAN based carbon fibers and MggLi alloy during the pressure infiltration process was undertaken [91] and Chen and co-workers [92] examined the interface in Mg matrix composites reinforced with carbon fiber. A Ni coated carbon fiber in a Mg matrix will form Mg-Ni compounds and a low melting point eutectic (508°C) [93]. 

Zhang K, Wang YQ, Zhou BL, Tensile properties of coated carbon fiber reinforced magnesium composites. Transactions of Non-ferrous Metals Society of China, 7(3), 86-89, 1997. 

R Zeng, E Han, W Ke, W Dietzel, KU Kainer, A Atrens, Influence of microstructure on tensile properties and fatigue crack growth in extruded magnesium alloy AM60, International Journal of Fatigue, 2010, 32, 411 19. 

Table 9.2 Tensile properties of pure Mg, diecast (DC) and extruded (E) magnesium alloys...

Talc is a hydrated magnesium silicate that is composed of thin platelets primarily white in color. Talc is useful for lowering the cost of the formulation with minimal effect on physical properties. Because of its platy structure and aspect ratio, these extenders are considered reinforcement. Polymers filled with platy talc exhibit higher stiffness, tensile strength, and creep resistance, at ambient as well as elevated temperatures, than do polymers filled with particulate fillers. Talc is inert to most chemical reagents and acids. The actual chemical composition for commercial talc varies and is highly dependent on the location of its mining site. 

Polymers filled with platy talc exhibit higher stiffness, tensile strength, and creep resistance than do polymers filled with standard particulate fillers. These properties are maintained at both ambient and elevated temperatures. Surface treatments for talc particles include magnesium and zinc stearates, silanes, and titanates. 

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