Metastable structural transformations and their influence on the properties of alpha plus beta-titanium alloys
Influence of metastable structural transformations on mechanical properties of alpha-beta phase titanium alloys
TITANIUM ALLOY↗
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The effect of microstructure on the fracture toughness of titanium alloys
The microstructure of the alpha titanium alloy Ti-5Al-2.5Sn and the metastable beta titanium alloy Beta 3 was examined. The material was from normal and extra low interstitial grade plates which were either air-cooled or furnace-cooled from an annealing treatment. Beta 3 was studied in alpha-aged and omega-aged plates which were heat treated to similar strength levels. Tensile and plane strain fracture toughness tests were conducted at room temperature on the alpha-aged material. The microstructure and fracture mechanisms of alloys were studied using optical metallography, electron microscopy, microprobe analyses, and texture pole figures. Future experiments are described.
Vanstone, R. H.↗
Applications of metastable microcrystalline alloys
The mechanical properties of rapidly quenched superalloys, aluminum alloys, stainless steels, and titanium alloys are briefly reviewed. Studies on the materials are mentioned, and the superplasticity properties of the alloys are highlighted.
Grant, N. J.↗
Submersion Quenching of Undercooled Liquid Metals in an Electrostatic Levitator
The NASA Marshall Space Flight Center (MSFC) electrostatic levitation (ESL) laboratory has a long history of providing materials research and thermophysical property data. The laboratory has recently added a new capability, a rapid quench system. This system allows samples to be dropped into a quench vessel that can be filled with a low melting point material, such as a gallium or indium alloy. Thereby allowing rapid quenching of undercooled liquid metals and alloys. This is the first submersion quench system inside an electrostatic levitator. The system has been tested successfully with samples of zirconium, iron-cobalt alloys, titanium-zirconium-nickel alloys, and silicon-cobalt alloys. This rapid quench system will allow materials science studies of undercooled materials and new materials development, including studies of metastable phases and transient microstructures. In this presentation, the system is described and some initial results are presented.
SanSoucie, Michael P.↗