TY - GEN
T1 - Producing a composite surface using friction stir processing
AU - Jun, Qu
AU - Zhili, Feng
AU - Hanbing, Xu
AU - Frederick, D. Alan
AU - Jolly, Brian C.
AU - David, Stan A.
PY - 2008
Y1 - 2008
N2 - Aluminum alloys would have much wider usage in bearing applications if their wear-resistance could be significantly improved. This investigation developed a solid-state surface engineering process to form an aluminum-alumina composite surface by friction stirring ceramic particles into an aluminum surface to improve the surface hardness and wear-resistance without sacrificing the bulk ductility and conductivity. Composite layers have been successfully processed on pure aluminum (Al 1100) surfaces that have a relatively uniform particle distribution with a concentration up to 25 vol% of alumina. Microscopic examination showed that particles were severely fractured during friction stir processing and, accordingly, the particle size decreased from the original 10-50 Urn to 1-5 urn in the friction stir processed composite layer. The microindentation hardness of the aluminum surface was increased from 0.33 to 0.70 GPa (HV) and the wear-resistance was improved by 30X when rubbing against a bearing steel. It has been demonstrated that powder placement methods and process parameters can be tailored to improve particle dispersion and surface hardness. Unlike most other surface engineering techniques, this process can form very thick layers, up to centimeters in thickness, avoiding delamination because of the inherent material continuity.
AB - Aluminum alloys would have much wider usage in bearing applications if their wear-resistance could be significantly improved. This investigation developed a solid-state surface engineering process to form an aluminum-alumina composite surface by friction stirring ceramic particles into an aluminum surface to improve the surface hardness and wear-resistance without sacrificing the bulk ductility and conductivity. Composite layers have been successfully processed on pure aluminum (Al 1100) surfaces that have a relatively uniform particle distribution with a concentration up to 25 vol% of alumina. Microscopic examination showed that particles were severely fractured during friction stir processing and, accordingly, the particle size decreased from the original 10-50 Urn to 1-5 urn in the friction stir processed composite layer. The microindentation hardness of the aluminum surface was increased from 0.33 to 0.70 GPa (HV) and the wear-resistance was improved by 30X when rubbing against a bearing steel. It has been demonstrated that powder placement methods and process parameters can be tailored to improve particle dispersion and surface hardness. Unlike most other surface engineering techniques, this process can form very thick layers, up to centimeters in thickness, avoiding delamination because of the inherent material continuity.
UR - http://www.scopus.com/inward/record.url?scp=44349184324&partnerID=8YFLogxK
U2 - 10.1115/IMECE2007-42083
DO - 10.1115/IMECE2007-42083
M3 - Conference contribution
AN - SCOPUS:44349184324
SN - 0791843076
SN - 9780791843079
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings
SP - 33
EP - 36
BT - Processing and Engineering Applications of Novel Materials
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME International Mechanical Engineering Congress and Exposition, IMECE 2007
Y2 - 11 November 2007 through 15 November 2007
ER -