Author: C. R. Whitsett Publisher: ISBN: Category : Languages : en Pages : 68
Book Description
The influence of additions of 0.1 wt% Er, 0.02 wt% Y, 0.05 wt% Y, and 0.038 wt% Y2O3 on the room-temperature tensile properties and fracture toughness of Ti-6Al-4V was studied. The alloys were cast by consumable-electrode arc-melting in vacuum. Er and Y were added in the form of Ti-25Er and Ti-25Y master alloys, and Y2O3 was added in the form of a fine powder. The alloys, after being forged and rolled, had only about half the nominal concentrations of rare-earth additives. The rolled plates were given various heat treatments to observe the combined effects of microstructure and rare-earth additives. The rare-earths effect grain refinement. The room-temperature tensile properties and fracture toughness of Ti-6Al-4V are not significantly altered by the rare-earths. The crystallographic texture developed during rolling also is unaffected by the rare-earth additives, although Y and Y2O3 effect an increased sharpness of near-transverse-basal texture components in alpha-beta annealed alloy. The uniform elongation of Ti-6Al-4V under tensile stress at high temperatures is increased by Er and Y additions. The high-temperature compressive stress-strain characteristics of heat treated Ti-6Al-4V are not altered by Er and Y. (Author).
Author: Charles R. Whitsett Publisher: ISBN: Category : Languages : en Pages : 100
Book Description
The influence of different concentrations of metallic yttrium, erbium, and mischmetal (MM) on the microstructure and room-temperature mechanical properties of Ti-6Al-4V was studied. Alloy ingots containing 0.02-0.3 wt% Y, 0.1-2.0 wt% Er, and 0.01-0.2 wt% MM were cast, forged, hot-rolled, and mill-annealed in the alpha-beta and beta fields. The metallic rare-earth additions produce a uniform dispersion of small (
Author: S. M. L. Sastry Publisher: ISBN: Category : Languages : en Pages : 62
Book Description
The influence of additions of 0.05-1.0 wt% Y and 0.2-2.0 wt% Er on the microstructure, slip distribution, fracture modes, and room- and elevated-temperature mechanical properties of Ti-8Al and Ti-10Al alloys was studied. Additions of up to 0.1 wt% Y and 0.2 wt% Er result in 50-200 nm incoherent dispersoids which effect grain refinement, reduce the planarity of slip, and significantly increase the ductility of Ti-8Al alloys. The additions further improve the room-temperature fracture toughness and room- and elevated-temperature low-cycle fatigue life of Ti-8Al and do not significantly alter the creep of Ti-8Al and Ti-10Al alloys. Higher amounts of Y and Er additions produce large, 1-5 micron dispersoids and produce no significant grain refinement or improvements in strength and ductility of the alloys.
Author: T. C. Peng Publisher: ISBN: Category : Erbium Languages : en Pages : 98
Book Description
Effects of 0.01-2.0 wt% yttrium and erbium additions on rapid solidification processing, superplastic forming, welding, and strengthening of titanium alloys were determined. Ti-8Al-Y and Ti-8Al-Er alloys were rapidly solidified by laser surface melting and electron beam melting and splat-quenching with the objective of simultaneously producing coherent Ti3Al precipitates and incoherent dispersoids. Rapid solidification at cooling rates> 10,000 K/s resulted in 10-100 nm incoherent dispersoids in Ti-8Al-1.5Y and in a nonequilibrium, supersaturated, solid solution Ti-8Al-1.5Si. Dispersoid formation and stability at 700-900 C were studied, and the annealing conditions for the production of a large volume-fraction of fine incoherent dispersoids and of coherent Ti3Al precipitates were determined. Metallic yttrium additions to Ti-6Al-2Nb-1Mo-0.8Ta improved the superplastic formability and increased the strength and ductility of laser weldments. The superposition of solid-solution strengthening, precipitation strengthening, and grain-size strengthening in ingot processed Ti-xAl (x = 4, 5.5, 7.0, 8.5, and 10.0) alloys was studied.
Author: Shankar M. L. Sastry Publisher: ISBN: Category : Languages : en Pages : 70
Book Description
The influence of additions of 0.05 wt% Y and 0.1 wt% Er on the room-temperature tensile properties, plane-strain and plane-stress fracture toughness, creep, and high-temperature high-strain-rate deformation characteristics of Ti-6Al-4V was studied. 75kg ingots of Ti-6Al-4V, Ti-6Al-4V-0.05Y and Ti-6Al-4V-0.1Er were cast, forged, and rolled into 80-mm, 30-mm, and 13-mm plates. The Y and Er additions reduce the high-temperature flow stress of Ti-6Al-4V at strain rates of 0.05 and 0.5/s and significantly improve ingot-breakdown forging by suppressing the edge cracking. The Y-containing Ti-6Al-4V has lower flow stress and higher strain-rate sensitivity of flow stress and consequently better superplasticity than the reference alloy at 906 C at strain rates of .00001 to .001/s. The room-temperature plane-strain fracture toughness, yield stress, ductility, and high-temperature creep are not significantly altered by the rare-earth additions. (Author).
Author: Matthew J. Donachie Publisher: ASM International ISBN: 161503062X Category : Technology & Engineering Languages : en Pages : 381
Book Description
Designed to support the need of engineering, management, and other professionals for information on titanium by providing an overview of the major topics, this book provides a concise summary of the most useful information required to understand titanium and its alloys. The author provides a review of the significant features of the metallurgy and application of titanium and its alloys. All technical aspects of the use of titanium are covered, with sufficient metals property data for most users. Because of its unique density, corrosion resistance, and relative strength advantages over competing materials such as aluminum, steels, and superalloys, titanium has found a niche in many industries. Much of this use has occurred through military research, and subsequent applications in aircraft, of gas turbine engines, although more recent use features replacement joints, golf clubs, and bicycles.Contents include: A primer on titanium and its alloys, Introduction to selection of titanium alloys, Understanding titanium's metallurgy and mill products, Forging and forming, Castings, Powder metallurgy, Heat treating, Joining technology and practice, Machining, Cleaning and finishing, Structure/processing/property relationships, Corrosion resistance, Advanced alloys and future directions, Appendices: Summary table of titanium alloys, Titanium alloy datasheets, Cross-reference to titanium alloys, Listing of selected specification and standardization organizations, Selected manufacturers, suppliers, services, Corrosion data, Machining data.
Author: C. R. Whitsett
Author: Charles R. Whitsett
Author: S. M. L. Sastry
Author: C. R. Whitsett
Author: T. C. Peng
Author: Shankar M. L. Sastry
Author: Matthew J. Donachie
Author: Craig G. Kirkpatrick
Author: Bernard Richard Rose
Author: Yong Liu