title: A low-cost hierarchical nanostructured beta-titanium alloy with high strength.
abstract: Lightweighting of automobiles by use of novel low-cost, high strength-to-weight ratio structural materials can reduce the consumption of fossil fuels and in turn CO2 emission. Working towards this goal we achieved high strength in a low cost β-titanium alloy, Ti-1Al-8V-5Fe (Ti185), by hierarchical nanostructure consisting of homogenous distribution of micron-scale and nanoscale α-phase precipitates within the β-phase matrix. The sequence of phase transformation leading to this hierarchical nanostructure is explored using electron microscopy and atom probe tomography. Our results suggest that the high number density of nanoscale α-phase precipitates in the β-phase matrix is due to ω assisted nucleation of α resulting in high tensile strength, greater than any current commercial titanium alloy. Thus hierarchical nanostructured Ti185 serves as an excellent candidate for replacing costlier titanium alloys and other structural alloys for cost-effective lightweighting applications.
authors.affiliation: Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99354, USA.
authors.forename: Arun
authors.initials: A
authors.lastname: Devaraj
authors.affiliation: Energy and Environment Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99354, USA.
authors.forename: Vineet V
authors.initials: VV
authors.lastname: Joshi
authors.affiliation: Department of Materials Science and Engineering, Texas A&M University, 3003 College Station, Texas 77843, USA.
authors.forename: Ankit
authors.initials: A
authors.lastname: Srivastava
authors.affiliation: Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99354, USA.
authors.forename: Sandeep
authors.initials: S
authors.lastname: Manandhar
authors.affiliation: Advance Materials Products Inc. (ADMA), 1890 Georgetown Road, Hudson, Ohio 44236, USA.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Moxson
authors.affiliation: Advance Materials Products Inc. (ADMA), 1890 Georgetown Road, Hudson, Ohio 44236, USA.
authors.forename: Volodymyr A
authors.initials: VA
authors.lastname: Duz
authors.affiliation: Energy and Environment Directorate, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, Washington 99354, USA.
authors.forename: Curt
authors.initials: C
authors.lastname: Lavender