Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7990991 | Journal of Alloys and Compounds | 2018 | 6 Pages |
Abstract
Homogenized Cu-4Ti (wt%) and Cu-4Ti-1.4B (wt%) powders were cold pressed and then sintered by pulsed, millisecond Nd:YAG laser system. Phases present in laser sintered samples were characterized by X-ray diffraction (XRD), while quantitative chemical analysis of the sintered samples was conducted using inductively coupled plasma-atomic emission spectrometry (ICP-AES). The microstructure of powders and laser sintered foils was examined with scanning electron microscope with an energy dispersive X-ray spectroscope (EDS). Optical microscopy was used also for microstructural characterization of the foils. The tensile test was carried out using a universal testing machine with a crosshead speed of 0.5â¯mm/min at room temperature. Foils with dimensions 20â¯Ãâ¯6â¯Ãâ¯0.4â¯mm were used for tensile testing. In the obtained Cu-Ti foils, after aging at 550â¯Â°C for 4â¯h, rapidly solidified structure and metastable Cu4Ti precipitates affected high degree of copper matrix strengthening (peak aged). In Cu-Ti-TiB2 foils, after aging at 550â¯Â°C for 3â¯h, rapidly solidified structure, as well as the presence of TiB2 particles and metastable Cu4Ti precipitates, also affected high degree of copper matrix strengthening which, thanks to the ceramic particles, is retained at longer times (6â¯h). Fractured surfaces were observed with an optical microscope. It was determined that the best structural and mechanical properties of laser-sintered foils were reached using the following parameters: laser frequency 4â¯Hz, laser pulse duration 9â¯ms, pulse energy â¼20â¯J, number of scans 2.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
J. StaÅ¡iÄ, D. BožiÄ,