Showing papers on "Metal matrix composite published in 1982"
39 citations
Patent•
20 May 1982TL;DR: In this article, a structural composite is constructed by placing a reinforcement between foils of a superplastic metal alloy to provide stack, and the stack is then heated to a temperature at which the metal alloy exhibits its super-plastic properties, and pressure is applied to the heated stack.
Abstract: A composite is produced by placing a reinforcement between foils of a superplastic metal alloy to provide stack. The stack is then heated to a temperature at which the metal alloy exhibits its superplastic properties, and pressure is applied to the heated stack. This causes the foils to flow around the reinforcement and diffusion bond together in the solid state. A structural composite is thus formed comprising a reinforcement dispersed throughout a matrix of superplastic metal alloy.
29 citations
TL;DR: In this paper, the corrosion rates of a tungsten reinforced depleted uranium alloy metal matrix composite have been measured, by immersion tests, in three environments (laboratory air, distilled water, and 3.5% NaCl) and compared to the rates of the matrix alloy alone.
Abstract: The corrosion rates of a tungsten reinforced depleted uranium alloy metal matrix composite have been measured, by immersion tests, in three environments (laboratory air, distilled water, and 3.5% NaCl) and compared to the rates of the matrix alloy (DU-0.75 Ti) alone. The corrosion rates of both specimens are negligible in laboratory air, increase in distilled water, and are greatest in NaCl for a 30 day period. In all environments the matrix allo is preferentially attacked. In distilled water the corrosion rate of the matrix alloy is 3 times greater than the composite whereas in NaCl the corrosion rate of the composite is 1.3 times greater than the matrix. In electrochemical tests the composite was simulated by coupling separate samples of the fiber and matrix and the short-circuit (galvanic) currents were measured. A comparison of the corrosion rates calculated from the galvanic currents and from immersio tests shows the principal reaction of the composite in NaCl is galvanic coupling of the matrix and fiber.
19 citations
01 Apr 1982
TL;DR: In this paper, nine metal matrix composite materials were tested over the frequency range 4 to 10,000 Hz, at room temperature, to determine their damping properties, with the graphite/aluminum composites generally showing the best performance.
Abstract: : Nine metal matrix composite materials were tested over the frequency range 4 to 10,000 Hz, at room temperature, to determine their damping properties. Cantilever beam samples were measured using both a logarithmic decrement test and a resonant dwell test to cover the entire frequency range. At a peak stress of 5 ksi, measured loss factors ranged from about .0003 to .004, with the graphite/aluminum composites generally showing the best (highest) performance (loss factor). These values are measurably no greater than those obtainable on the unreinforced matrix alloys. (Author)
4 citations
01 Jan 1982
TL;DR: In this paper, the x-ray techniques used to measure the residual stresses and then present and discuss the residual stress results obtained on aluminum, magnesium and titanium matrix composites were described.
Abstract: Due to the large difference in the coefficients of thermal expansion of the continuous fibers and the metal matrix in metal matrix composites, a large residual stress pattern could be expected when the composite is cooled from the fabrication temperature to room temperature. This paper will first briefly describe the x-ray techniques used to measure the residual stresses and then present and discuss the residual stress results obtained. Experiments were done on aluminum, magnesium and titanium matrix composites. This paper will concentrate on the measurements in the aluminum graphite system. It should be noted that the reported residual stresses are only from the matrix phase due to the difficulty introduced by the large texture in the graphite fibers.
1 citations
TL;DR: In this article, the corrosion rates of a tungsten reinforced depleted uranium alloy metal matrix composite have been measured, by immersion tests, in three environments (laboratory air, distilled water, and 3.5% NaCl) and compared to the rates of the matrix alloy alone.
Abstract: The corrosion rates of a tungsten reinforced depleted uranium alloy metal matrix composite have been measured, by immersion tests, in three environments (laboratory air, distilled water, and 3.5% NaCl) and compared to the rates of the matrix alloy (DU-0.75 Ti) alone. The corrosion rates of both specimens are negligible in laboratory air, increase in distilled water, and are greatest in NaCl for a 30 day period. In all environments the matrix allo is preferentially attacked. In distilled water the corrosion rate of the matrix alloy is 3 times greater than the composite whereas in NaCl the corrosion rate of the composite is 1.3 times greater than the matrix. In electrochemical tests the composite was simulated by coupling separate samples of the fiber and matrix and the short-circuit (galvanic) currents were measured. A comparison of the corrosion rates calculated from the galvanic currents and from immersio tests shows the principal reaction of the composite in NaCl is galvanic coupling of the matrix and fiber.