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Machining‐Induced Surface Residual Stress Behavior in Al 2 O 3 –SiC Nanocomposites
Author(s) -
Chou Irene A.,
Chan Helen M.,
Harmer Martin P.
Publication year - 1996
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.1151-2916.1996.tb08989.x
Subject(s) - materials science , residual stress , machining , composite material , nanocomposite , surface roughness , annealing (glass) , profilometer , surface finish , grinding , metallurgy
The machining and subsequent annealing behavior of an Al 2 O 3 ‐SiC nanocomposite (A1 2 O 3 + 5 vol% 0.2 μm SiC particles) was compared to that of single‐phase A1 2 O 3 . The machining‐induced residual line force was determined by measuring the extent of elastic bending in thin disk specimens, and the surface roughness was evaluated by profilometry. The results showed that, when the two materials were subjected to the same grinding conditions, they developed compressive residual stresses and surface roughness values of similar magnitude. The maximum thickness of the residual stress layers was estimated to be ∼ 10 μm for the A1 2 O 3 and ∼12 μm for the nanocomposite. A direct linear correlation was observed between the residual force and the surface roughness for different machining treatments. Annealing of the machined samples produced complete relaxation of residual stresses in the single‐phase Al 2 O 3 , whereas only partial stress relaxation occurred for the nanocomposite.