Stress-induced martensitic transformations in NiTi and NiTi-TiC composites investigated by neutron diffraction

Technical Report · Wed Dec 30 23:00:00 EST 1998

DOI:https://doi.org/10.2172/334213· OSTI ID:334213

Vaidyanathan, R ^[1]; Bourke, M A.M. ^[2]; Dunand, D C ^[3]

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1. Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Materials Science and Engineering
2. Los Alamos National Lab., NM (United States)
3. Northwestern Univ., Evanston, IL (United States)

Superelastic NiTi (51.0 at% Ni) with 0, 10 and 20 vol% TiC particles were deformed under uniaxial compression as neutron diffraction spectra were simultaneously obtained. The experiments yielded in-situ measurements of the thermoelastic stress-induced transformation. A detailed Rietveld determination is made of the phase fractions and the evolving strains in the reinforcing TiC particles and the austenite as it transforms to martensite on loading (and its subsequent back transformation on unloading). These strains are used to shed light on the phenomenon of load transfer in composites where the matrix undergoes a stress-induced phase transformation.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 334213
• Report Number(s): LA-UR--98-3567; ON: DE99002251
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
CRYSTAL-PHASE TRANSFORMATIONS
EXPERIMENTAL DATA
MARTENSITE
NEUTRON DIFFRACTION
NICKEL ALLOYS
STRAINS
STRESSES
TITANIUM ALLOYS
TITANIUM CARBIDES