title: Hydrogen-enabled microstructure and fatigue strength engineering of titanium alloys.
abstract: Traditionally, titanium alloys with satisfactory mechanical properties can only be produced via energy-intensive and costly wrought processes, while titanium alloys produced using low-cost powder metallurgy methods consistently result in inferior mechanical properties, especially low fatigue strength. Herein, we demonstrate a new microstructural engineering approach for producing low-cost titanium alloys with exceptional fatigue strength via the hydrogen sintering and phase transformation (HSPT) process. The high fatigue strength presented in this work is achieved by creating wrought-like microstructures without resorting to wrought processing. This is accomplished by generating an ultrafine-grained as-sintered microstructure through hydrogen-enabled phase transformations, facilitating the subsequent creation of fatigue-resistant microstructures via simple heat treatments. The exceptional strength, ductility, and fatigue performance reported in this paper are a breakthrough in the field of low-cost titanium processing.
authors.affiliation: Department of Metallurgical Engineering, University of Utah, 135 South 1460 East Room 412, Salt Lake City, Utah 84112, USA.|Lightweight and Specialty Metals Branch, United States Army Research Laboratory, 4600 Deer Creek Loop RDRL-WMM-F Aberdeen Proving Ground, Maryland 21005, USA.
authors.forename: James D
authors.initials: JD
authors.lastname: Paramore
authors.affiliation: Department of Metallurgical Engineering, University of Utah, 135 South 1460 East Room 412, Salt Lake City, Utah 84112, USA.
authors.forename: Zhigang Zak
authors.initials: ZZ
authors.lastname: Fang
authors.affiliation: Department of Metallurgical Engineering, University of Utah, 135 South 1460 East Room 412, Salt Lake City, Utah 84112, USA.
authors.forename: Matthew
authors.initials: M
authors.lastname: Dunstan
authors.affiliation: Department of Metallurgical Engineering, University of Utah, 135 South 1460 East Room 412, Salt Lake City, Utah 84112, USA.
authors.forename: Pei
authors.initials: P
authors.lastname: Sun
authors.affiliation: Lightweight and Specialty Metals Branch, United States Army Research Laboratory, 4600 Deer Creek Loop RDRL-WMM-F Aberdeen Proving Ground, Maryland 21005, USA.
authors.forename: Brady G
authors.initials: BG
authors.lastname: Butler