TY - JOUR
T1 - Columnar-to-equiaxed transition mechanism and remarkable strengthening effect in additive manufactured pure titanium induced by copper addition
AU - Wang, Jiani
AU - Liu, Kaiyue
AU - Xue, Xiangyi
AU - Li, Jinshan
AU - Chen, Biao
N1 - Publisher Copyright:
© 2024 Elsevier Inc.
PY - 2024/3
Y1 - 2024/3
N2 - Additive manufacturing (AM) has unique advantages in the production of structural components with complex shapes. However, AM metallic materials face a common phenomenon of coarse columnar grains, leading to degraded mechanical properties. To overcome this problem in AM titanium (Ti) alloys, this study introduced alloying elements copper (Cu) into pure Ti. The effects of Cu addition on the grain morphology and mechanical properties of Ti matrix were investigated. It was revealed that with the addition of 6.5 wt% Cu, prior-β grains of AM Ti completely changed from columnar grains larger than ∼200 μm to equiaxed grains of ∼23 μm. Simultaneously, α grains changed from columnar to laths shape, and co-precipitated with Ti2Cu to form a fine (Ti2Cu + α) eutectic structure. Consequently, Cu addition results in remarkable strength improvement of Ti matrix, viz. 205% and 222% increments in yield strength and ultimate tensile strength, respectively. The columnar-to-equiaxed transition mechanism and strengthening behavior of the high-strength AM Ti[sbnd]Cu alloy were discussed. This study may provide new insight into the fabrication of high-performance AM metallic components with fully equiaxed grains.
AB - Additive manufacturing (AM) has unique advantages in the production of structural components with complex shapes. However, AM metallic materials face a common phenomenon of coarse columnar grains, leading to degraded mechanical properties. To overcome this problem in AM titanium (Ti) alloys, this study introduced alloying elements copper (Cu) into pure Ti. The effects of Cu addition on the grain morphology and mechanical properties of Ti matrix were investigated. It was revealed that with the addition of 6.5 wt% Cu, prior-β grains of AM Ti completely changed from columnar grains larger than ∼200 μm to equiaxed grains of ∼23 μm. Simultaneously, α grains changed from columnar to laths shape, and co-precipitated with Ti2Cu to form a fine (Ti2Cu + α) eutectic structure. Consequently, Cu addition results in remarkable strength improvement of Ti matrix, viz. 205% and 222% increments in yield strength and ultimate tensile strength, respectively. The columnar-to-equiaxed transition mechanism and strengthening behavior of the high-strength AM Ti[sbnd]Cu alloy were discussed. This study may provide new insight into the fabrication of high-performance AM metallic components with fully equiaxed grains.
KW - Additive manufacturing (AM)
KW - Cu
KW - The columnar-to-equiaxed transition (CET)
KW - Ti
UR - http://www.scopus.com/inward/record.url?scp=85185196928&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2024.113750
DO - 10.1016/j.matchar.2024.113750
M3 - 文章
AN - SCOPUS:85185196928
SN - 1044-5803
VL - 209
JO - Materials Characterization
JF - Materials Characterization
M1 - 113750
ER -