TY - JOUR
T1 - Effects of annealing time on the microstructures and tensile properties of formed laminated composites in Ti-Ni system
AU - Zhang, Youjing
AU - Cheng, Xingwang
AU - Cai, Hongnian
AU - Zhang, Hongmei
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - The effects of annealing time on the microstructures and tensile properties of formed laminated composites in Ti-Ni system were investigated. The results showed that Ti2Ni, TiNi and Ni3Ti intermetallics were formed between the Ti and Ni foils after 1 h annealing. These intermetallics grew thicker with the increase of annealing time until the complete consumption of Ti layers. TiNi with two different crystal structures (B2 and B19′) were identified in the composites after 1 h and 6 h annealing. In the composites after 12 h, 18 h, 24 h and 36 h annealing, Ni4Ti3phase in different shapes precipitated in different regions (interfaces and the interior) of TiNi layers, resulting in the multi-step martensite transformation behavior of TiNi layers. The tensile test results revealed that high TiNi content in the composite after 12 h annealing had the highest yield strength (391 MPa), ultimate tensile strength (912 MPa) and elongation (6.3%) of all the composites. With the increase of annealing time, the thickness of TiNi layers decreased and that of Ni3Ti layers increased, leading to the decrease of strength and elongation of the composites after18, 24 h and 36 h annealing, which indicated that TiNi layers had great influence on the strength and ductility of these composites.
AB - The effects of annealing time on the microstructures and tensile properties of formed laminated composites in Ti-Ni system were investigated. The results showed that Ti2Ni, TiNi and Ni3Ti intermetallics were formed between the Ti and Ni foils after 1 h annealing. These intermetallics grew thicker with the increase of annealing time until the complete consumption of Ti layers. TiNi with two different crystal structures (B2 and B19′) were identified in the composites after 1 h and 6 h annealing. In the composites after 12 h, 18 h, 24 h and 36 h annealing, Ni4Ti3phase in different shapes precipitated in different regions (interfaces and the interior) of TiNi layers, resulting in the multi-step martensite transformation behavior of TiNi layers. The tensile test results revealed that high TiNi content in the composite after 12 h annealing had the highest yield strength (391 MPa), ultimate tensile strength (912 MPa) and elongation (6.3%) of all the composites. With the increase of annealing time, the thickness of TiNi layers decreased and that of Ni3Ti layers increased, leading to the decrease of strength and elongation of the composites after18, 24 h and 36 h annealing, which indicated that TiNi layers had great influence on the strength and ductility of these composites.
KW - Laminated composites
KW - Microstructure
KW - Tensile properties
KW - Ti-Ni system
UR - https://www.scopus.com/pages/publications/85009070805
U2 - 10.1016/j.jallcom.2017.01.006
DO - 10.1016/j.jallcom.2017.01.006
M3 - Article
AN - SCOPUS:85009070805
SN - 0925-8388
VL - 699
SP - 695
EP - 705
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -