Effects of Trace Si Addition on the Microstructures and Tensile Properties of Ti-3Al-8V-6Cr-4Mo-4Zr Alloy

Hongbo Ba, Limin Dong, Zhiqiang Zhang, Xiaofei Lei
2017 Metals  
The microstructural evolution and tensile properties of Ti-3Al-8V-6Cr-4Mo-4Zr titanium alloys with various Si contents were investigated. The results revealed that the addition of trace Si and the presence of Zr induced the formation of (TiZr) 6 Si 3 silicides, in the size range from 100 nm to 300 nm. The fine silicide precipitates refined β grains. The tensile strength increased about 40 MPa due to precipitation strengthening and grain refinement, and the ductility of the two alloys was
more » ... . The tensile fracture mode of the alloys was dimple ductile fracture.
doi:10.3390/met7080286 fatcat:fpww2mkq6vbudcdp2bb2v2kw5i