ISSN:
1573-9066
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Summary Metallographic studies of W-Ni-Fe and W-Ni-Cu alloys demonstrated that grain growth during the formation of these alloys is affected by two mechanisms: dissolution-deposition and coalescence of pairs and groups of tungsten grains. The rate of the process of merging by sintering, which is governed by the rate of surface diffusion of atoms, may be expected to be commensurate to the rate of particle growth as a result of material transport through the liquid phase. However, the role of the process of merging by sintering will depend on the system being sintered, in particular on the composition of the low-melting constituent and, consequently, on its melting point, the solubility of the solid in the liquid phase (degree of supersaturation), angle of wetting, etc. Naturally, by changing the arithmetic mean radius of particles in a system, the coalescence process may change the character of the relationship proposed by Greenwood. For this reason, the regularity of particle growth, particularly under conditions of equilibrium composition of the liquid-phase constituent systems, will require further thorough study.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00774258
