Effects of temperature and grain size on deformation and fracture in recrystallized Ni3Al doped with boron

Kim, M. S.; Hanada, Shuji; Watanabe, Satoshi; Izumi, Osamu

doi:10.1007/bf01045355

Cited by 11 publications

(2 citation statements)

References 17 publications

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“…Based on the experimental results by Bewlay and Cantor [38] and Grant and Cantor, [39] in which the geometry of the close-coupled atomization device used is similar to that used in the present investigation, the velocity profile of the atomization gas may be described as follows: [39,40,41] (0,Z) ϭ exp (ϪZ/) [2] zg g0 where zg and rg are the axial and radial components of gas velocity, respectively; g0 is the initial gas velocity; ϱ is the axial gas velocity at Z ϭ ϱ; and is the exponential decay coefficient. Equations [4] and [5] are applicable only for r/(0.004 ϩ 0.268Z) Ͻ 1, i.e., inside the spray cone.…”

Section: Momentum Profile Of Atomization Gasmentioning

confidence: 94%

“…In the present study, N Re falls into a wider range than the one mentioned previously. [2] through [5] and the parameters listed in the Appendix, the one-dimensional trajectory and velocity profile of a given droplet may be calculated numerically once r 0 and zd (r, 0) are given. [6] through [8], together with the gas velocity profiles calculated from Eqs.…”

Section: Velocity Profile Of Dropletsmentioning

confidence: 99%

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Particle penetration during spray forming and Co-injection of Ni3Al + B/Al2O3 intermetallic matrix composite

Lawrynowicz

Lavernia

1997

Metall Mater Trans B

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composite, with 11 vol pct of Al 2 O 3 particles incorporated into the matrix, was synthesized using a spray atomization and coinjection method. The penetration behavior of ceramic particles into atomized droplets during spray atomization and coinjection of Ni 3 Al ϩ B/Al 2 O 3 composite was investigated experimentally and numerically. It was found that the extent of incorporation of Al 2 O 3 into Ni 3 Al ϩ B droplets depends on the solidification condition of the droplets at the time of droplet/particle interaction. Penetration was observed only in fully liquid droplets or partially solidified droplets. No penetration was observed for droplets smaller than ϳ40 m, because droplets in this size range were fully solidified at the point of coinjection, and penetration was not possible for fully solidified droplets. The distribution of penetrated Al 2 O 3 in the Ni 3 Al ϩ B droplets was, in general, uniform, with no trends of segregation observed. However, it was noted that most Al 2 O 3 particles were located at the grain boundaries inside the droplets, while some Al 2 O 3 particles were trapped inside the droplets by primary dendrite arms resulting from a fast moving solidification front typically associated with rapid solidification processes such as spray atomization. Finally, it was believed that the Al 2 O 3 particles facilitated nucleation upon penetration of the Ni 3 Al ϩ B droplets either by means of thermal gradients or compatibility of preferred growth planes.

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