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Creep Properties in Ti O 2 Nanoparticle Reinforced Aluminum Matrix Composites
Author(s) -
Shin Jaehyuck,
Bae Donghyun
Publication year - 2013
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201300099
Subject(s) - creep , materials science , composite material , nanoparticle , stress (linguistics) , aluminium , exponent , matrix (chemical analysis) , lattice diffusion coefficient , nanotechnology , medicine , linguistics , philosophy , magnetic resonance imaging , radiology , effective diffusion coefficient
Creep behaviors of the aluminum composites containing 3 vol% of TiO 2 nanoparticles (15 nm in size) are studied at 523 K. In the high stress region, the composites show enhanced creep resistance exhibiting high value of the apparent stress exponent and the high threshold stress, which is determined to be 162 MPa. The true stress exponent of minimum creep strain rate is found to be 5 implying the creep is controlled by lattice diffusion. Negligible stress dependence in the creep rate is found when the applied stresses are <200 MPa, since the creep behavior depends dominantly on the diffusional flows of the matrix that are strictly limited by the nanoparticles.