| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
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Light Alloys, Advanced Forming Processes and Characterization
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| Presentation Title |
Microstructure Modification and Mechanical Properties Improvement of Lightweight Ti-Rich Medium-Entropy Alloys through Minor Boron Addition |
| Author(s) |
Po-Sung Chen, Bao-Teng Kuo, Yu-Chin Liao, Pei-Hua Tsai, Li-In Wang, Jason Shian-Ching Jang, Chih-Yen Chen |
| On-Site Speaker (Planned) |
Po-Sung Chen |
| Abstract Scope |
In this study, a series of lightweight Ti-rich MEAs (BX) were mircoalloyed with minor boron addition to modify the microstructure and optimize the mechanical properties. The OM and EBSD exhibit the grain refinement by boron adding. The SEM image showed the TiB precipitated at the grain boundary and the EDS results showed high boron signal at the precipitate. By TEM, the precipitate was identified as TiB. In addition, the hardness increased with B additions from 321Hv to 378Hv. For further improving the material properties, the MEAs were conducted with thermo-mechanical treatment. Through OM observation, the recrystallization ratio increased with raising annealing temperature. Meanwhile, the recrystallization behavior tends to be sluggish by boron doping, resulting in increasing recrystallization temperature. After recrystallization, the elongation of B0 to B0.2 exceeded 20%. Conversely, the elongation of B0.4 decreased to 10%. In overall, the B0.2 MEA presented the optima synergy of yield strength and ductility. |