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5239 |
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Thursday, June 08, 2017, Hall 27 2:40 PM Pre- & Post-Treatment |
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Microstructural evolution and mechanical property enhancement of a cold sprayed Cu-Zn alloy coating by post-spray friction stir processing |
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Chunjie Huang / University Bourgogne Franche-Comté, France Chunjie Huang / University Bourgogne Franche-Comte, IRTES EA7274, France Wenya Li/ Northwestern Polytechnical University, China Yingchun Xie/ Université Bourgogne Franche-Comté, IRTES EA7274, France Marie-Pierre Planche/ University Bourgogne Franche-Comte, IRTES EA7274, France Hanlin Liao/ University Bourgogne Franche-Comte, IRTES EA7274, France Ghislain Montavon/ University Bourgogne Franche-Comte, IRTES EA7274, France C. Verdy*/ University Bourgogne Franche-Comté, France |
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In this study, a solid-state deposition process, cold spraying (CS) was employed to deposit a thick Cu-Zn alloy coating. Friction stir processing (FSP) technique another very effective solid-state technique, was subjected to produce a high-strength ultrafine-grained coating. Results show that the CSed coating highlights an elongated microstructure with an average grain size of 1.9 ¼m and a fraction of the low-angle grain boundaries of 78.42%. After FSP, the coating was characterized by the ultrafine grains with an average of 0.6 ¼m and a fraction of the high-angle grain boundaries of 90.47% (a fraction of £3 boundaries about 27.49 %). The FSPed coating was composed with ± (Cu3Zn), ²2 (CuZn) and ³ (Cu5Zn8) phases while the CSed coating was mainly ± phase. In addition, significant mechanical properties enhancement was observed after FSP, i.e. the fracture elongation from 0.17% to 0.81% and ultimate tensile strength from 87.2±5.9 MPa to 257.5±4.8 MPa, the precipitates of ²2 and little ³ has a significant effect on the fracture of the FSPed coating at room temperature. |