High performance aerospace alloys via rapid solidification processing

Das, Samar K.; Davis, L. A.

doi:10.1016/0025-5416(88)90116-4

Cited by 158 publications

(35 citation statements)

References 22 publications

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“…5(a)) mainly consisted of rod-shaped precipitates of 30~50 nm in size, which were identified as Mg 51 Zn 20 (Fig. 5(b)) [8,9]. And, both Mg 6 Ca 2 Zn 3 and Mg 51 Zn 20 precipitates were found in the Mg-6Zn-1.5Ca alloy both before and after the aging treatment; the spherical precipitates in the rectangular box of Fig.…”

Section: Resultsmentioning

confidence: 92%

Age hardening phenomena of rapidly quenched non-combustible Mg−Al−Si−Ca and Mg−Zn−Ca alloys

et al. 2001

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Non-combustible Mg-Al-Si and Mg-Zn base alloys containing Ca were rapidly quenched via melt spinning. The melt-spun ribbons were aged, and then the effects of additional elements on age hardening behavior and microstructural change were investigated. Age hardening occurred after aging at 200 o C in the Mg-AlSi-Ca alloys mainly due to the formation of Al 2 Ca or Mg 2 Ca phases, whereas it occurred in the Mg-ZnCa alloys mostly due to the distribution of Mg 6 Ca 2 Zn 3 and Mg 2 Ca. With the increase of Ca content, the hardness values of the aged ribbons were increased. In this study, Mg-6Zn-5Ca alloy showed the maximum peak hardness after aging at 200 o C for 1 hour. On the contrary, Mg-xZn-1.5Ca alloys couldn't show the pronounced peak hardness because of low Ca content.

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Section: Resultsmentioning

confidence: 92%

Age hardening phenomena of rapidly quenched non-combustible Mg−Al−Si−Ca and Mg−Zn−Ca alloys

et al. 2001

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“…Cobalt based films are also widely used in recording media. '2 The most important electrochemical process for Ni oxide electrodes, which occurs in alkaline solutions, can be described as Ni'1 (OH), + OW Ni"OOH + H,O + e [1] A similar reaction can be written for cobalt oxide electrodes" and 3Co11 (OH)2 + 2 OH-# Co"111O4 + 4H2O + 2e [21 Co"(OH)2 + OW a Co'1100H + H2O + e Co"OOH + OW # Co"TO, + H2O + e [3] [4] However, it is a well-established fact that these redox reactions are more complex than indicated here''4 and that they involve the intercalation/deintercalation of cations in basic solutions1' in which the oxides are stable, i.e., in simplified form '6 Ni" (or Co")oxide + 1.5 OW + 0.5Na s Ni"(or CoIv) oxide (1.5 OH)(0.5 Nat) + e [5] Nickel and cobalt oxide-hydroxide films can be prepared by the anodic oxidation of the metallic substrate," cathodic precipitation,' electron-beam * Electrochemical Society Student Member. * * Electrochemical Society Active Member.…”

Section: Discussionmentioning

confidence: 99%

“…of the CPE of the film to C is accomplished by the following equation39 C = CPE sin (n 90) [1] Although the lowest value of the a exponent which can be used in the above equation is somewhat arbitrary, 0.8 cn .c 1 has been suggested as an appropriate range.39…”

Section: Amentioning

confidence: 99%

Oxide Film Formation at a Microcrystalline Al Alloy in Room Temperature Neutral Borate Solution

Thomas

Birss

1997

J. Electrochem. Soc.

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The differences in the electrochemical behavior of a rapidly solidified, two-phase (matrix and dispersoid) microcrystalline Al-based alloy containing Fe, IT, and Si (FVSO812 alloy), the bulk forms of its phases, and polycrystalline Al were investigated in neutral borate buffer solution. FVS0812 shows higher activity than the matrix and pure Al, whlle the dispersoid is the most active, due to oxygen evolution and dissolution, even in this benign solution. Barrier oxide films formed at FVS0812 appear to be generally uniform and similar in thickness to those formed at the matrix material. At low anodizing voltage the dispersoid phase appears to form an oxide film, although some loss of Fe and V is inferred. Howeve; at higher voltages, evidence for the incomplete oxidation of the dispersoid phase and its incorporation and/or subsequent loss from some sites in the oxide film is seen, leading to a more flawed film of less uniform thickness. The higher capacitance of the oxide film at FVSO812 compared to that of films formed under identical conditions at Al and the matrix is consistent with the penetration of solution, via flaws, into the oxide film and the development of regions of thinner oxide film at dispersoid containing sites.

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“…1) Ribbons produced by this method possess excellent mechanical strength 2) and favorable electromagnetic properties, 3) which have been widely used in transformers as iron cores to promote their conversion performance. 4) Among the various RSP methods, the planar-flow melt-spinning (PFMS) method 5) is the most popular technique both in the academic sector and the industrial community due to its mass production capability to produce wide, thin, and uniform amorphous ribbons continuously.…”

Section: Introductionmentioning

confidence: 99%

Simulation for the Effect of Wetting Conditions of Melt Puddle on the Fe–Si–B Ribbon Alloy in the Planar-Flow Melt-Spinning Process

Chen

Wu³

et al. 2017

ISIJ Int.

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The wetting effect of melt puddle between nozzle and chilling wheel in the planar-flow melt-spinning process was simulated numerically. A two-dimensional model was developed for the puddle in which the inertial force, viscosity, surface tension, wettability, and heat transfer with phase transformation were incorporated. The wetting conditions include the static contact angle between the puddle and nozzle and the dynamic contact angle between the puddle and chill wheel, and their influence on the puddle shape, ribbon thickness and air-pocket frequency were evaluated. Results show that the puddle shape was affected significantly by the wetting condition on the nozzle surface rather than that on the wheel surface. The contact condition between the puddle and nozzle must be non-wetting in order to reach a steady puddle shape rapidly. On the other hand, a wetting contact condition is preferable between the puddle and wheel surface to reduce the amount of air entrainment and lower the air-pocket frequency on the ribbon surface.

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High performance aerospace alloys via rapid solidification processing

Cited by 158 publications

References 22 publications

Age hardening phenomena of rapidly quenched non-combustible Mg−Al−Si−Ca and Mg−Zn−Ca alloys

Age hardening phenomena of rapidly quenched non-combustible Mg−Al−Si−Ca and Mg−Zn−Ca alloys

Oxide Film Formation at a Microcrystalline Al Alloy in Room Temperature Neutral Borate Solution

Simulation for the Effect of Wetting Conditions of Melt Puddle on the Fe–Si–B Ribbon Alloy in the Planar-Flow Melt-Spinning Process

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