TY - JOUR
T1 - Enhanced mechanical properties of in situ synthesized TiC/Ti composites by pulsed laser directed energy deposition
AU - Wang, Yongxia
AU - Tan, Hua
AU - Feng, Zhe
AU - Zhang, Fengying
AU - Shang, Weixun
AU - Clare, Adam T.
AU - Lin, Xin
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/10/10
Y1 - 2022/10/10
N2 - Titanium matrix composites (TMCs) have attracted extensive attention of researchers due to their excellent properties. However, the strength and ductility of TMCs hardly co-exist and show a trade-off between each other. To overcome the problem, in this study, with feeding the commerically pure titanium (CP–Ti) powder decorated by nano carbon, TiC reinforced Ti matrix composites were synthesized in situ by Pulsed Laser Directed Energy Deposition (PLDED). As the C content increases, the size, content and morphology of the TiC particles gradually change and the irregular block α phase transform to lath α phase in the matrix. As for Ti+0.6 wt% C, due to the strengthening effect of dispersed eutectic TiC and the evolution of morphology of α phase in the matrix, the ultimate tensile strength of TiC/Ti composites (940 MPa) is ∼84.3% and ∼108.9% higher than that of the PLDED and forged CP-Ti respectively, while retaining excellent elongation to failure (18.9%), which effectively solves the problem of strong-plastic contradiction existing in the preparation of TMCs. And at this carbon content, the friction and wear properties of the composites are effectively improved, the friction coefficient (0.26) is 55% lower than that of CP-Ti (0.58) obtained under the same process. This work shows a great potential way to significantly improve the mechanical properties of titanium alloys.
AB - Titanium matrix composites (TMCs) have attracted extensive attention of researchers due to their excellent properties. However, the strength and ductility of TMCs hardly co-exist and show a trade-off between each other. To overcome the problem, in this study, with feeding the commerically pure titanium (CP–Ti) powder decorated by nano carbon, TiC reinforced Ti matrix composites were synthesized in situ by Pulsed Laser Directed Energy Deposition (PLDED). As the C content increases, the size, content and morphology of the TiC particles gradually change and the irregular block α phase transform to lath α phase in the matrix. As for Ti+0.6 wt% C, due to the strengthening effect of dispersed eutectic TiC and the evolution of morphology of α phase in the matrix, the ultimate tensile strength of TiC/Ti composites (940 MPa) is ∼84.3% and ∼108.9% higher than that of the PLDED and forged CP-Ti respectively, while retaining excellent elongation to failure (18.9%), which effectively solves the problem of strong-plastic contradiction existing in the preparation of TMCs. And at this carbon content, the friction and wear properties of the composites are effectively improved, the friction coefficient (0.26) is 55% lower than that of CP-Ti (0.58) obtained under the same process. This work shows a great potential way to significantly improve the mechanical properties of titanium alloys.
KW - Additive manufacturing
KW - Mechanical properties
KW - Pulsed laser direct energy deposition
KW - TiC/Ti
KW - Titanium matrix composite
UR - http://www.scopus.com/inward/record.url?scp=85137596182&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2022.143935
DO - 10.1016/j.msea.2022.143935
M3 - 文章
AN - SCOPUS:85137596182
SN - 0921-5093
VL - 855
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 143935
ER -