Ni 脆性相的生成。此外,NiTi/Co/Ti6Al4V 和NiTi/Zr/Ti6Al4V 接头均在NiTi 边界附近出现硬度最大值,分别为543HV 和467HV,且均在NiTi 边界处发生脆性断裂,其中NiTi/Zr/Ti6Al4V 接头有着较大的抗拉强度315.9 MPa 和断裂应变1.74%。
Abstract
In order to reduce the formation of brittle intermetallic compounds in NiTi/Ti6Al4V dissimilar laser welding and improve the mechanical properties of welded joints
NiTi/Ti6Al4V laser welding was performed by adding Co and Zr interlayers respectively. The effect of Co/Zr interlayer on microstructure
phase structure and mechanical properties of welded joints was studied. The results show that the microstructure of the fusion zone in NiTi/Co/Ti6Al4V and NiTi/Zr/Ti6Al4V joints is composed of equiaxed dendrites
columnar dendrites and some macroscopic segregation zones. Co and Zr can respectively replace Ni and Ti in Ti
2
Ni brittle intermetallic compounds
whi
ch inhibits the formation of brittle phases. In addition
the maximum hardness of NiTi/Co/Ti6Al4V and NiTi/Zr/Ti6Al4V joints is near the NiTi boundary
543HV and 467HV respectively. Meanwhile
brittle fracture occurs at the NiTi boundary. The NiTi/Zr/Ti6Al4V joint has a large tensile strength of 315.9 MPa and fracture strain of 1.74%.
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Related Author
ZHANG Zaiyun
LIU Yingang
DONG Jinxin
YU Hongyao
CAO Rui
QIANG Wei
WU Sichen
CAO Long
Related Institution
School of Aeronautics, Northwestern Polytechnical University
National Key Laboratory of Aircraft Configuration Design, Northwestern Polytechnical University