Beta Titanium Alloy Metal-Metal Laminates: Fabrication, Structure, and Mechanical Properties.

摘要

The fabrication procedure, structure, and mechanical properties of metal-metal laminates composed of three layers of the near beta titanium alloy, Ti-10V-2Fe-3Al, interleaved by thin laminae of Transage 134 (Ti-2Al-12V-2Sn-6Zr), a martensitic beta titanium alloy, are presented and discussed. The laminates were formed by hot roll bonding of layered lay-ups welded at the seams for stability. Following bonding, the tensile and fracture toughness properties of the laminate material heat treated to varying strength levels were measured and contrasted with monolithic Ti-10-2-3 heat treated in the same way. A solution treated and aged heat treatment that tripled critical fracture toughness in the laminate material with only a moderate loss in strength was developed. The tensile, fracture toughness, and microstructural properties associated with each heat treatment are reviewed and analyzed. In addition, the mechanisms of fracture toughness improvement in this laminate system are described and rationalized with the properties of the two alloys. In general, the two alloys are shown to be a excellent titanium metal-metal laminate system for fracture critical structural application.