Sintering

Paper Summary:

Sintering, which is a stage of powder metallurgy, is a thermal process that creates inter-particle welds. It is where powder compacts are annealed in a controlled atmosphere to a temperature at which solid-state diffusion occurs. On the other hand, recrystallization is the process of the formation of new strain-free grains from initially cold-worked grains. This paper examines an experiment that had, as its objectives, the intention of examining of the effects of sintering and recrystallization on the microstructure and the hardness of the specimens. The samples used are copper and copper-zinc powders for sintering and brass for recrystallization. The paper shows that the copper and copper-zinc powders are compacted and are sintered in a nitrogen-containing atmosphere at different temperature and time settings. The brass samples are cold-worked and are annealed at different temperature and time settings. The paper includes tables.

Paper Outline:
Abstract
Introduction
Experimental Section
Results and Discussion
Conclusion
References

From the Paper:

"When a polycrystalline metal is cold worked, the grain boundaries act to interrupt the slip processes that occur in the crystals. The lattice adjacent to the grain boundaries is much more distorted in the center of the grains. Decreasing the grain size increases the grain boundary area and, as a consequence, the volume and the uniformity of the distorted metal. This effect decreases the number of possible sites of nucleation and, therefore, the smaller the grains of the metal before cold work, the greater will be the rate of nucleation and the smaller the recrystallized grain size for a given degree of deformation."

Sample of Sources Used:

• Callister, W.D. Materials Science and Engineering: An Introduction. John Wiley and Sons, Inc., 2001.
• Shackelford, J.F. Introduction to Materials Science for Engineers. 5th ed. New Jersey: Prentice-Hall, Inc.; 2000.
• Dieter, G.E. Mechanical Metallurgy. McGraw-Hill Inc.
• Jenkins, I. Powder Metallurgy-An Overview. London: The Institute of Metals, 1991.
• Rose, C.L. Sintering. New Jersey: Metal Powder Industries Federation, 1999.

APA Citation:

MLA Citation: