Design and implementation of a multiaxial loading capability during heating on an engineering neutron diffractometer

A gripping capability was designed, implemented, and tested for in situ neutron diffraction measurements during multiaxial loading and heating on the VULCAN engineering materials diffractometer at the spallation neutron source at Oak Ridge National Laboratory. The proposed capability allowed for the...

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Bibliographic Details
Published in:Review of scientific instruments 2014-10, Vol.85 (10)
Main Authors: Benafan, O., Advanced Materials Processing and Analysis Center, Materials Science and Engineering Department, University of Central Florida, Orlando, Florida 32816, Padula, S. A., Skorpenske, H. D., An, K., Vaidyanathan, R.
Format: Article
Language:English
Subjects:
CONTROL
DESIGN
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
MATERIALS SCIENCE
NEUTRON DIFFRACTION
NEUTRON SOURCES
NEUTRON SPECTRA
NICKEL ALLOYS
ORNL
SHAPE MEMORY EFFECT
SPALLATION
STRAINS
TEMPERATURE RANGE 0400-1000 K
TITANIUM ALLOYS
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Summary:A gripping capability was designed, implemented, and tested for in situ neutron diffraction measurements during multiaxial loading and heating on the VULCAN engineering materials diffractometer at the spallation neutron source at Oak Ridge National Laboratory. The proposed capability allowed for the acquisition of neutron spectra during tension, compression, torsion, and/or complex loading paths at elevated temperatures. The design consisted of age-hardened, Inconel{sup ®} 718 grips with direct attachment to the existing MTS load frame having axial and torsional capacities of 100 kN and 400 N·m, respectively. Internal cooling passages were incorporated into the gripping system for fast cooling rates during high temperature experiments up to ~1000 K. The specimen mounting couplers combined a threaded and hexed end-connection for ease of sample installation/removal without introducing any unwanted loads. Instrumentation of this capability is documented in this work along with various performance parameters. The gripping system was utilized to investigate deformation in NiTi shape memory alloys under various loading/control modes (e.g., isothermal, isobaric, and cyclic), and preliminary results are presented. The measurements facilitated the quantification of the texture, internal strain, and phase fraction evolution in NiTi shape memory alloys under various loading/control modes.
ISSN:0034-6748
1089-7623