title: Effect of ice-quenching on the change in hardness of a Pd-Au-Zn alloy during porcelain firing simulation.
abstract: This study examined the effect of ice-quenching after degassing on the change in hardness of a Pd-Au-Zn alloy during porcelain firing simulations. By ice-quenching after degassing, the specimens were softened due to homogenization without the need for an additional softening heat treatment. The lowered hardness by ice-quenching after degassing was recovered greatly from the first stage of porcelain firing process by controlling the cooling rate. The increase in hardness during cooling after porcelain firing was attributed to the precipitation of the f.c.t. PdZn phase containing Au, which caused severe lattice strain in the interphase boundary between the precipitates and matrix of the f.c.c. structure. The final hardness was slightly higher in the ice-quenched specimen than in the specimen cooled at stage 0 (the most effective cooling rate for alloy hardening) after degassing. This was attributed to the more active grain interior precipitation during cooling in the ice-quenched specimen after degassing.
authors.affiliation: Department of Dental Materials, Institute of Translational Dental Science and BK21 PLUS Project, School of Dentistry, Pusan National University.
authors.forename: Hye-Jeong
authors.initials: HJ
authors.lastname: Shin
authors.forename: Min-Jung
authors.initials: MJ
authors.lastname: Kim
authors.forename: Hyung-Il
authors.initials: HI
authors.lastname: Kim
authors.forename: Yong Hoon
authors.initials: YH
authors.lastname: Kwon
authors.forename: Hyo-Joung
authors.initials: HJ
authors.lastname: Seol
mesh_terms: D000497:Alloys; D003776:Dental Porcelain; D006047:Gold Alloys; D006244:Hardness; D006358:Hot Temperature; D007053:Ice; D008422:Materials Testing; D010165:Palladium; D015032:Zinc
chemical_list: D000497:Alloys; D006047:Gold Alloys; D007053:Ice; D003776:Dental Porcelain; D010165:Palladium; D015032:Zinc