Mechanical Properties of Hierarchical, Refractory-Based Nanocomposites

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Presentation transcript:

Mechanical Properties of Hierarchical, Refractory-Based Nanocomposites Ian McCue1, S. Ryan1, K. Hemker2, X. Xu3, N. Li4 M. Chen3, J. Erlebacher1 Materials Research Society Fall Conference, Boston MA 1 Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218 2 Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218 3 WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-85 4 Materials Physics and Applications Division, MPA-CINT, Los Alamos National Laboratory, Los Alamos, NM 87545 This work is supported by NSF DMR-1402726, DMR-1003901 2/1/2019 Johns Hopkins University

Titanium-Tantalum Precursor Alloys 2/1/2019 Ian Daniel McCue

Liquid Metal Dealloying: Titanium Alloys (Ta, W, Nb, Mo) 2/1/2019 Ian Daniel McCue

Liquid Metal Dealloying Mechanism (LMD) Ti-Ta Ti-Cu J. Erlebacher, I. McCue U.S. Patent Application Serial No. 13/975,659 filed on August 26, 2013 2/1/2019 Ian Daniel McCue

2/1/2019 Ian Daniel McCue

Ti-Ta(s)+Cu(l) System Liquid Metal Dealloying Ti65Ta35 alloy was immersed in molten Cu at 1084 oC Cu dissolved into this piece over 10 minutes Result is a composite structure of Cu-Ta with features on the order of 5 μm Residual Ti conc. ~20 at. % Elemental mapping shows bright features are Ta and dark features are Cu 2/1/2019 Ian Daniel McCue

Controlling Ligament Size 100 nm Ta 30 nm Ta 50-100 nm W-Cu HRTEM Interface 2/1/2019 Ian Daniel McCue

Metal-Metal Composite 2/1/2019 Ian Daniel McCue

Mechanical Testing of Tantalum-Copper Composites 2/1/2019 Ian Daniel McCue

Mechanical Testing of Tungsten-Copper Composites 1.1 μm, 650 nm 20-200 nm, 1.5 μm Pure W Cu50Ti50-Cu75Ti25 Cu90Ti10 2/1/2019 Ian Daniel McCue

Single Crystal Micropillar Experiments Uchic MD. et al Science 2004:305;986. M.D. Uchic, et al. Science 305, 986 (2004) 2/1/2019 Ian Daniel McCue

Deformed Composite 2/1/2019 Ian Daniel McCue

Composite Grain Boundary Engineering 2/1/2019 Ian Daniel McCue

Summary Original process was created to dealloy and fabricate new porous materials: Tailorable feature sizes from 30 nm to 10 μm Novel composites were made: Fully dense Interpenetrating bicontinuous networks Phase separated material with coherent interfaces Mechanical properties were characterized: Strengthening effect mirrors effects seen in micropillars Large, 1 cm3, samples can be fabricated and tested Relevant structural materials (Radiation Tolerant?) 2/1/2019 Ian Daniel McCue

Acknowledgements Jonah Erlebacher (advisor) Erlebacher Research Group Ellen Benn Bernard Gaskey Kevin Hemker (microtensile and compression) Steve Ryan Mingwei Chen and Nan Li(TEM) Xiandong Xu 2/1/2019

Questions? 2/1/2019