TY - JOUR
T1 - Effect of aging temperature on microstructure and mechanical properties of a novel Ti-6121 alloy
AU - Chen, Jianwei
AU - Wang, Le
AU - Fan, Qunbo
AU - Sang, Zhuoyue
AU - Xu, Yao
AU - Wang, Changhao
AU - Yao, Jiahao
AU - Zhou, Zhiming
AU - Yang, Liu
AU - Liu, Zheng
AU - Gao, Jinliang
AU - Feng, Heyong
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/6/25
Y1 - 2023/6/25
N2 - The effect of heat treatment on the microstructure and mechanical properties of a novel α + β Ti-6.2Al-0.8V-2.25Mo-1.2Cr-0.5Si (wt%) alloy was investigated in this paper. Microstructure and crystalline structure of the alloys after different solution and aging treatments were identified by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results indicated that a multi-scale microstructure was possessed in the heat-treated samples, which was composed of equiaxed primary α (αp) phase and nano-scale acicular secondary α (αs). After 900 ℃ solution for 1 h and 550 ℃ aging for 6 h, the alloy exhibited the optimal combination of strength and ductility (the ultimate tensile strength of ∼1387 MPa, the elongation of ∼11 %). Furthermore, the combination mechanism of strength-ductility of the sample under this condition was investigated. The samples before and after tensile fracture were analyzed using transmission electron microscope (TEM) and electron back-scattered diffraction (EBSD). The results showed that a large proportion of nano-scale acicular αs phases precipitated from the β matrix can effectively prevent the slip of dislocations and enhance the strength of the alloy. In addition, the multi-scale microstructure can create the strain partition, which can mediate the strain incompatibility between the αp and the transformed β (βT) to obtain an excellent combination of strength and ductility.
AB - The effect of heat treatment on the microstructure and mechanical properties of a novel α + β Ti-6.2Al-0.8V-2.25Mo-1.2Cr-0.5Si (wt%) alloy was investigated in this paper. Microstructure and crystalline structure of the alloys after different solution and aging treatments were identified by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results indicated that a multi-scale microstructure was possessed in the heat-treated samples, which was composed of equiaxed primary α (αp) phase and nano-scale acicular secondary α (αs). After 900 ℃ solution for 1 h and 550 ℃ aging for 6 h, the alloy exhibited the optimal combination of strength and ductility (the ultimate tensile strength of ∼1387 MPa, the elongation of ∼11 %). Furthermore, the combination mechanism of strength-ductility of the sample under this condition was investigated. The samples before and after tensile fracture were analyzed using transmission electron microscope (TEM) and electron back-scattered diffraction (EBSD). The results showed that a large proportion of nano-scale acicular αs phases precipitated from the β matrix can effectively prevent the slip of dislocations and enhance the strength of the alloy. In addition, the multi-scale microstructure can create the strain partition, which can mediate the strain incompatibility between the αp and the transformed β (βT) to obtain an excellent combination of strength and ductility.
KW - Heat treatment
KW - Microstructure evolution
KW - Multi-scale microstructure
KW - Strength-ductility combination
KW - Tensile properties
UR - http://www.scopus.com/inward/record.url?scp=85150364280&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2023.169612
DO - 10.1016/j.jallcom.2023.169612
M3 - Article
AN - SCOPUS:85150364280
SN - 0925-8388
VL - 947
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 169612
ER -