Materials Reports  2020, Vol. 34 Issue (Z1): 289-292 |
| METALS AND METAL MATRIX COMPOSITES |
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| Formation Mechanism of Black Flecks During Solution Treatment of TC18Titanium Alloy |
| ZHU Xuefeng1, ZHOU Yu2, FAN Kai1, WANG Ke2
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1 Hunan Goldsky Titanium Technology Co., Ltd., Changde 415001, China;
2 School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China |
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Abstract During the solution treatment of TC18 titanium alloy in the single β phase region, the black fleck formed and acted as a heterogeneous microstructure. Many characterization methods, such as optical microscope (OM), scanning electron microscope (SEM), electron back-scattered diffraction (EBSD), and so on, were used to make a precise characterization on the black fleck. Meanwhile, some additional heat treatments were carried out for revealing the formation mechanism of black fleck. The results showed that the massive precipitation of acicular α phase made the β grain exhibit as a black fleck morphology, and the black fleck existed as a large and accumulated morphology. During solution treatment, accompanying a slow cooling rate in the center region of the TC18 titanium alloy bar, the formation of subgrain and remnant dislocation in the non-completed recrystallized β grain promoted the precipitation of acicular α phase.
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Published: 01 July 2020
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| Fund:This work was supported by the National Natural Science Foundation of China (51971046). |
| About author:: Xuefeng Zhu, engineer, mainly engaged in the forging and heat treatment of titanium alloys. |
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