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Effect of Diamond Dispersion on the Superplastic Rheology of Zinc Sulfide
Author(s) -
Xue Liang A.,
Raj Rishi
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb07578.x
Subject(s) - diamond , materials science , zinc sulfide , softening , grain size , metallurgy , superplasticity , creep , particle size , zinc , flow stress , hardening (computing) , composite material , chemical engineering , strain rate , microstructure , layer (electronics) , engineering
The dispersion of diamond particles in superplastic zinc sulfide produces flow softening at low diamond concentrations, and hardening at high concentrations. The minimum in the flow stress is observed at 5 wt% (5.5 vol%) diamond content. The softening can be explained in terms of the grain refinement in the ZnS in the presence of diamond particles. The smaller grain size is shown to reduce the flow stress by enhancing the rate of diffusional creep. The hardening is believed to have been caused by the formation of a network among the diamond particles at high concentrations. The fact that the diamond particle size was approximately onethird the grain size of ZnS may have contributed to the network formation.