Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5460596 | Journal of Alloys and Compounds | 2017 | 30 Pages |
Abstract
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 1Â 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 B19â²) were identified in the composites after 1Â h and 6Â h annealing. In the composites after 12Â h, 18Â h, 24Â h and 36Â h annealing, Ni4Ti3 phase 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 12Â h annealing had the highest yield strength (391Â MPa), ultimate tensile strength (912Â 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, 24Â h and 36Â h annealing, which indicated that TiNi layers had great influence on the strength and ductility of these composites.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Youjing Zhang, Xingwang Cheng, Hongnian Cai, Hongmei Zhang,