Journal ArticleDOI
The sintering of nickel/aluminium spheres to nickel plates
A. G. Elliot,Z. A. Munir +1 more
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In this article, an activation energy of 69 kcal/mole was found for sintering Ni/1.5, 1.0, 2.0 and 10.0% Al spheres to nickel plates.Abstract:
Spheres of nickel, and of nickel containing 0.5,1.0, 2.0, and 10.0 wt % aluminium, all of approximately 100μm diameter, were sintered under vacuum to nickel plates for various times within the temperature range 1000 to 1300° C. Neck growth was determined as a function of time. Values for the exponent of time in the neck growth equation,x/a = Atn of 0.19, 0.18, 0.15, and 0.16 were found for the above compositions, respectively. An activation energy of 33 kcal/mole was found for sintering nickel spheres to nickel plates. An activation energy of 69 kcal/mole was found for sintering Ni/1.0% Al spheres to nickel plates.read more
Citations
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Current effects on neck growth in the sintering of copper spheres to copper plates by the pulsed electric current method
TL;DR: In this paper, the effect of a pulsed dc on the sintering of copper spheres to copper plates was investigated and it was shown that the current had a marked effect on neck growth between the spheres and the plates.
Journal ArticleDOI
Neck growth kinetics during microwave sintering of nickel powder
TL;DR: In this paper, the neck growth exponent in (x/a)n = Bt was determined as a function of time for microwave sintering of nickel powder, and the activation energy of 48 kJ−mol−1 was found.
Journal ArticleDOI
Morphology relations during surface-transport controlled sintering
Randall M. German,Z. A. Munir +1 more
TL;DR: In this article, a minimum surface area neck configuration is assumed and interparticle coordination is considered, and an empirical expression relating neck size and coordination to surface area has been derived.
Journal ArticleDOI
Sintering phenomena and mechanical strength of nickel based materials in direct metal laser sintering process—a molecular dynamics study
Yi Zhang,Jing Zhang +1 more
TL;DR: In this article, an atomistic scale model was developed to investigate the diffusion of atoms during nickel sintering, which showed a 5-fold twinning structure at 1200 K, and two parallel twin boundaries at 1300 K.
A Multi-Scale Multi-Physics Modeling Framework of Laser Powder Bed Fusion Additive Manufacturing Process
Jing Zhang,Yi Zhang,Weng Hoh Lee,Linmin Wu,Sugrim Sagar,Lingbin Meng,Hyun-Hee Choi,Yeon-Gil Jung +7 more
TL;DR: In this paper, a multi-scale physics-based modeling framework is presented to understand the interrelationship between AM processing parameters and resulting properties, in particular, a multiscale approach spanning from atomic, particle, to component levels is employed.
References
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Journal ArticleDOI
Morphological Changes of a Surface of Revolution due to Capillarity‐Induced Surface Diffusion
F. A. Nichols,W. W. Mullins +1 more
TL;DR: In this article, a finite-difference method has been developed for the general case of an arbitrary surface of revolution and solutions have been obtained for the specific problems of blunting of field-emission tips and the sintering of spheres.
Journal ArticleDOI
Metal‐Ceramic Interactions: III, Surface Tension and Wettability of Metal‐Ceramic Systems
Michael Humenik,W. D. Kingery +1 more
TL;DR: In this article, the surface tension and wettability of silicon, iron, and nickel in contact with various refractory materials were evaluated at elevated temperatures using a precise sessile-drop method.
Journal ArticleDOI
Messung der Korngrenzendiffusion von Nickel‐63 in Nickel und γ‐Eisen
W. Lange,A. Hässner,G. Mischer +2 more
TL;DR: In this paper, the grain-boundary diffusion of Ni-63 in Nickel and γ-iron is investigated by a residual-activity method in the temperature regions 850 to 1100 °C and 940 to 1130 °C.
Journal ArticleDOI
Sintering in multicomponent metallic systems
TL;DR: In this paper, the volume changes of synthetic compacts during sintering are mainly controlled by interdiffusion, and large volume expansions due to the Kirkendall effect were actually measured.