thermomechanical treatment of Cu-Cr-Ti (RE) Alloys of

Title: thermomechanical treatment of Cu-Cr-Ti (RE) Alloys of
　　Author: Huang Sanlong
　　Degree-granting units: Xi'an University of Technology
　　Keywords: Cu-Cr-Ti alloy;; cold deformation;; rare earth Dy, Y;; microstructure;; hardness;; conductivity
　　Summary:
　　In this paper, Cu-Cr-Ti (RE) alloys after cold deformation in the aging of its organization and performance. Using optical microscope, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) by means of microstructure Neodymium Magnets and composition of the characterization and analysis, focused on the alloy during aging of the precipitate morphology, distribution, and the alloy performance of the law of the rare-earth Dy, Y on the Cu-Cr-Ti (RE) alloys and properties. Through the above study, obtained the following results:
　　1 cold deformation before aging can be significantly improved Cu-0.3Cr-0.2Ti alloy and performance. Alloy after cold deformation by heat 500 ℃ 2h, alloy deformed along the direction of elongation, the second phase along the grain boundaries. When the deformation of 60%, the alloy uniformity, and the second phase precipitates more fully, as deformation increases, the grain boundary discontinuous phenomenon, the second phase began in the grain boundary enrichment grew up. Cu-0.3Cr-0.2Ti by 60% deformation +500 ℃ heat 2h, you can get a good overall performance, hardness and conductivity were 129HV and 83% IACS.
　　(2) the addition of rare earth Dy and Y varying degrees of improved Cu-0.3Cr-0.2Ti alloy hardness and conductivity. Y compared with the rare earth, rare earth Dy additions make the second-phase particles precipitated more small and relatively evenly distributed. After 60% cold deformation and aging 500 ℃ after heat 1.5h, and Cu-0.3Cr-0.2Ti alloy http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets compared, Cu-0.3Cr-0.2Ti-0.1Dy the hardness and conductivity were increased by 7.7% and 6.7 %, Cu-0.3Cr-0.2Ti-Y alloy hardness and conductivity were increased by 4.6% and 3%.
　　3 after cold deformation on the limitation of Cu-0.3Cr-0.2Ti-0.1Dy alloys and Cu-0.3Cr-0.2Ti-0.1Y alloy has a significant impact on performance. As the deformation increases, the hardness of both alloys increased significantly, while the conductivity rate decreased significantly. When the deformation of 40%, get a good overall performance, Cu-0.3Cr-0.2Ti-0.1Dy the hardness and conductivity were 127HV and 71% IACS; and Cu-0.3Cr-0.2Ti-0.1Y the hardness and conductivity were 123HV and 68.1% IACS.
　　Degree Year: 2010