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Lijing Lin,Xin Xian,Zhihong Zhong,Yucheng Wu,Peter K. Liaw 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.8
The effect of long-term thermal exposure at 700 °C on the microstructure and mechanical behavior of as-castCrMnFeCoNiAl0.25was investigated. Results indicated that microscopically, the as-cast alloy was not an equilibrium alloyto maintain a single FCC structure after long-term aging. The strip-like sigma phase (Cr-rich σ phase) and B2 phase (NiAl)precipitated in the FCC matrix and coarsened when the exposure time was increased. Due to the increased volume fractionand the strengthening of these precipitates, the yield strength and Vickers hardness increased considerably with increasingthe thermal exposure time up to 2000 h. The yield strength increased from 272 MPa for the as-cast alloy to 993 MPa for thealloy exposed for 2000 h. The hardness increased up to 322 Hv for the alloy exposed for 2000 h. However, the yield strengthdecreased to 664 MPa for the alloy exposed for 4000 h, owing to the coarsening of precipitates. The alloy maintained a goodcompressive plasticity after long-term aging.
Frictional and Tensile Properties of Conducting Polymer Coated Wool and Alpaca Fibers
Wang Lijing,Lin Tong,Wang Xungai,Kaynak Akif The Korean Fiber Society 2005 Fibers and polymers Vol.6 No.3
Wool and alpaca fibers were coated with polypyrrole by vapor-phase polymerisation method. The changes in frictional and tensile properties of the single fibers upon coating with the conductive polymer are presented. Coating a thin layer of polypyrrole on the alpaca and wool fibers results in a significant reduction in the fiber coefficient of friction, as the conducting polymer layer smooths the protruding edges of the fiber scales. It also reduces the directional friction effect of the fibers. Depending on the type of fiber, the coating may slightly enhance the tensile properties of the coated fibers.